src/uae_cpu/gencpu.c

/*
 * UAE - The Un*x Amiga Emulator
 *
 * MC68000 emulation generator
 *
 * This is a fairly stupid program that generates a lot of case labels that
 * can be #included in a switch statement.
 * As an alternative, it can generate functions that handle specific
 * MC68000 instructions, plus a prototype header file and a function pointer
 * array to look up the function for an opcode.
 * Error checking is bad, an illegal table68k file will cause the program to
 * call abort().
 * The generated code is sometimes sub-optimal, an optimizing compiler should
 * take care of this.
 *
 * Copyright 1995, 1996 Bernd Schmidt
 */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "sysdeps.h"
#include "readcpu.h"

#if defined(SPARC_V8_ASSEMBLY) || defined(SPARC_V9_ASSEMBLY)
#define SPARC_ASSEMBLY 0
#endif

#define BOOL_TYPE "int"

static FILE *headerfile;
static FILE *stblfile;

static int using_prefetch;
static int using_exception_3;
static int cpu_level;

/* For the current opcode, the next lower level that will have different code.
 * Initialized to -1 for each opcode. If it remains unchanged, indicates we
 * are done with that opcode.  */
static int next_cpu_level;

static int *opcode_map;
static int *opcode_next_clev;
static int *opcode_last_postfix;
static unsigned long *counts;

static void read_counts (void)
{
    FILE *file;
    unsigned long opcode, count, total;
    char name[20];
    int nr = 0;
    memset (counts, 0, 65536 * sizeof *counts);

    file = fopen ("frequent.68k", "r");
    if (file) {
        fscanf (file, "Total: %lu\n", &total);
        while (fscanf (file, "%lx: %lu %s\n", &opcode, &count, name) == 3) {
            opcode_next_clev[nr] = 4;
            opcode_last_postfix[nr] = -1;
            opcode_map[nr++] = opcode;
            counts[opcode] = count;
        }
        fclose (file);
    }
    if (nr == nr_cpuop_funcs)
        return;
    for (opcode = 0; opcode < 0x10000; opcode++) {
        if (table68k[opcode].handler == -1 && table68k[opcode].mnemo != i_ILLG
            && counts[opcode] == 0)
        {
            opcode_next_clev[nr] = 4;
            opcode_last_postfix[nr] = -1;
            opcode_map[nr++] = opcode;
            counts[opcode] = count;
        }
    }
    if (nr != nr_cpuop_funcs)
        abort ();
}

static char endlabelstr[80];
static int endlabelno = 0;
static int need_endlabel;

static int n_braces = 0;
static int m68k_pc_offset = 0;
static int insn_n_cycles;

static void start_brace (void)
{
    n_braces++;
    printf ("{");
}

static void close_brace (void)
{
    assert (n_braces > 0);
    n_braces--;
    printf ("}");
}

static void finish_braces (void)
{
    while (n_braces > 0)
        close_brace ();
}

static void pop_braces (int to)
{
    while (n_braces > to)
        close_brace ();
}

static int bit_size (int size)
{
    switch (size) {
     case sz_byte: return 8;
     case sz_word: return 16;
     case sz_long: return 32;
     default: abort ();
    }
    return 0;
}

static const char *bit_mask (int size)
{
    switch (size) {
     case sz_byte: return "0xff";
     case sz_word: return "0xffff";
     case sz_long: return "0xffffffff";
     default: abort ();
    }
    return 0;
}

static const char *gen_nextilong (void)
{
    static char buffer[80];
    int r = m68k_pc_offset;
    m68k_pc_offset += 4;

    insn_n_cycles += 4;

    if (using_prefetch)
        sprintf (buffer, "get_ilong_prefetch(%d)", r);
    else
        sprintf (buffer, "get_ilong(%d)", r);
    return buffer;
}

static const char *gen_nextiword (void)
{
    static char buffer[80];
    int r = m68k_pc_offset;
    m68k_pc_offset += 2;

    insn_n_cycles += 2;

    if (using_prefetch)
        sprintf (buffer, "get_iword_prefetch(%d)", r);
    else
        sprintf (buffer, "get_iword(%d)", r);
    return buffer;
}

static const char *gen_nextibyte (void)
{
    static char buffer[80];
    int r = m68k_pc_offset;
    m68k_pc_offset += 2;

    insn_n_cycles += 2;

    if (using_prefetch)
        sprintf (buffer, "get_ibyte_prefetch(%d)", r);
    else
        sprintf (buffer, "get_ibyte(%d)", r);
    return buffer;
}

static void fill_prefetch_0 (void)
{
    if (using_prefetch)
        printf ("fill_prefetch_0 ();\n");
}

static void fill_prefetch_2 (void)
{
    if (using_prefetch)
        printf ("fill_prefetch_2 ();\n");
}

static void swap_opcode (void)
{
  printf ("#ifdef HAVE_GET_WORD_UNSWAPPED\n");
  printf ("\topcode = ((opcode << 8) & 0xFF00) | ((opcode >> 8) & 0xFF);\n");
  printf ("#endif\n");
}

static void sync_m68k_pc (void)
{
    if (m68k_pc_offset == 0)
        return;
    printf ("m68k_incpc(%d);\n", m68k_pc_offset);
    switch (m68k_pc_offset) {
     case 0:
        /*fprintf (stderr, "refilling prefetch at 0\n"); */
        break;
     case 2:
        fill_prefetch_2 ();
        break;
     default:
        fill_prefetch_0 ();
        break;
    }
    m68k_pc_offset = 0;
}

/* getv == 1: fetch data; getv != 0: check for odd address. If movem != 0,
 * the calling routine handles Apdi and Aipi modes.
 * gb-- movem == 2 means the same thing but for a MOVE16 instruction */
static void genamode (amodes mode, char *reg, wordsizes size, char *name, int getv, int movem)
{
    start_brace ();
    switch (mode) {
     case Dreg:
        if (movem)
            abort ();
        if (getv == 1)
            switch (size) {
             case sz_byte:
#if defined(AMIGA) && !defined(WARPUP)
                /* sam: I don't know why gcc.2.7.2.1 produces a code worse */
                /* if it is not done like that: */
                printf ("\tuae_s8 %s = ((uae_u8*)&m68k_dreg(regs, %s))[3];\n", name, reg);
#else
                printf ("\tuae_s8 %s = m68k_dreg(regs, %s);\n", name, reg);
#endif
                break;
             case sz_word:
#if defined(AMIGA) && !defined(WARPUP)
                printf ("\tuae_s16 %s = ((uae_s16*)&m68k_dreg(regs, %s))[1];\n", name, reg);
#else
                printf ("\tuae_s16 %s = m68k_dreg(regs, %s);\n", name, reg);
#endif
                break;
             case sz_long:
                printf ("\tuae_s32 %s = m68k_dreg(regs, %s);\n", name, reg);
                break;
             default:
                abort ();
            }
        return;
     case Areg:
        if (movem)
            abort ();
        if (getv == 1)
            switch (size) {
             case sz_word:
                printf ("\tuae_s16 %s = m68k_areg(regs, %s);\n", name, reg);
                break;
             case sz_long:
                printf ("\tuae_s32 %s = m68k_areg(regs, %s);\n", name, reg);
                break;
             default:
                abort ();
            }
        return;
     case Aind:
        printf ("\tuaecptr %sa = m68k_areg(regs, %s);\n", name, reg);
        break;
     case Aipi:
        printf ("\tuaecptr %sa = m68k_areg(regs, %s);\n", name, reg);
        break;
     case Apdi:
        switch (size) {
         case sz_byte:
            if (movem)
                printf ("\tuaecptr %sa = m68k_areg(regs, %s);\n", name, reg);
            else
                printf ("\tuaecptr %sa = m68k_areg(regs, %s) - areg_byteinc[%s];\n", name, reg, reg);
            break;
         case sz_word:
            printf ("\tuaecptr %sa = m68k_areg(regs, %s) - %d;\n", name, reg, movem ? 0 : 2);
            break;
         case sz_long:
            printf ("\tuaecptr %sa = m68k_areg(regs, %s) - %d;\n", name, reg, movem ? 0 : 4);
            break;
         default:
            abort ();
        }
        break;
     case Ad16:
        printf ("\tuaecptr %sa = m68k_areg(regs, %s) + (uae_s32)(uae_s16)%s;\n", name, reg, gen_nextiword ());
        break;
     case Ad8r:
        if (cpu_level > 1) {
            if (next_cpu_level < 1)
                next_cpu_level = 1;
            sync_m68k_pc ();
            start_brace ();
            printf ("\tuaecptr %sa = get_disp_ea_020(m68k_areg(regs, %s), next_iword());\n", name, reg);
        } else
            printf ("\tuaecptr %sa = get_disp_ea_000(m68k_areg(regs, %s), %s);\n", name, reg, gen_nextiword ());

        break;
     case PC16:
        printf ("\tuaecptr %sa = m68k_getpc () + %d;\n", name, m68k_pc_offset);
        printf ("\t%sa += (uae_s32)(uae_s16)%s;\n", name, gen_nextiword ());
        break;
     case PC8r:
        if (cpu_level > 1) {
            if (next_cpu_level < 1)
                next_cpu_level = 1;
            sync_m68k_pc ();
            start_brace ();
            printf ("\tuaecptr tmppc = m68k_getpc();\n");
            printf ("\tuaecptr %sa = get_disp_ea_020(tmppc, next_iword());\n", name);
        } else {
            printf ("\tuaecptr tmppc = m68k_getpc() + %d;\n", m68k_pc_offset);
            printf ("\tuaecptr %sa = get_disp_ea_000(tmppc, %s);\n", name, gen_nextiword ());
        }

        break;
     case absw:
        printf ("\tuaecptr %sa = (uae_s32)(uae_s16)%s;\n", name, gen_nextiword ());
        break;
     case absl:
        printf ("\tuaecptr %sa = %s;\n", name, gen_nextilong ());
        break;
     case imm:
        if (getv != 1)
            abort ();
        switch (size) {
         case sz_byte:
            printf ("\tuae_s8 %s = %s;\n", name, gen_nextibyte ());
            break;
         case sz_word:
            printf ("\tuae_s16 %s = %s;\n", name, gen_nextiword ());
            break;
         case sz_long:
            printf ("\tuae_s32 %s = %s;\n", name, gen_nextilong ());
            break;
         default:
            abort ();
        }
        return;
     case imm0:
        if (getv != 1)
            abort ();
        printf ("\tuae_s8 %s = %s;\n", name, gen_nextibyte ());
        return;
     case imm1:
        if (getv != 1)
            abort ();
        printf ("\tuae_s16 %s = %s;\n", name, gen_nextiword ());
        return;
     case imm2:
        if (getv != 1)
            abort ();
        printf ("\tuae_s32 %s = %s;\n", name, gen_nextilong ());
        return;
     case immi:
        if (getv != 1)
            abort ();
        printf ("\tuae_u32 %s = %s;\n", name, reg);
        return;
     default:
        abort ();
    }

    /* We get here for all non-reg non-immediate addressing modes to
     * actually fetch the value. */

    if (using_exception_3 && getv != 0 && size != sz_byte) {        
        printf ("\tif ((%sa & 1) != 0) {\n", name);
        printf ("\t\tlast_fault_for_exception_3 = %sa;\n", name);
        printf ("\t\tlast_op_for_exception_3 = opcode;\n");
        printf ("\t\tlast_addr_for_exception_3 = m68k_getpc() + %d;\n", m68k_pc_offset);
        printf ("\t\tException(3, 0);\n");
        printf ("\t\tgoto %s;\n", endlabelstr);
        printf ("\t}\n");
        need_endlabel = 1;
        start_brace ();
    }

    if (getv == 1) {
        switch (size) {
         case sz_byte: insn_n_cycles += 2; break;
         case sz_word: insn_n_cycles += 2; break;
         case sz_long: insn_n_cycles += 4; break;
         default: abort ();
        }
        start_brace ();
        switch (size) {
         case sz_byte: printf ("\tuae_s8 %s = get_byte(%sa);\n", name, name); break;
         case sz_word: printf ("\tuae_s16 %s = get_word(%sa);\n", name, name); break;
         case sz_long: printf ("\tuae_s32 %s = get_long(%sa);\n", name, name); break;
         default: abort ();
        }
    }

    /* We now might have to fix up the register for pre-dec or post-inc
     * addressing modes. */
    if (!movem)
        switch (mode) {
         case Aipi:
            switch (size) {
             case sz_byte:
                printf ("\tm68k_areg(regs, %s) += areg_byteinc[%s];\n", reg, reg);
                break;
             case sz_word:
                printf ("\tm68k_areg(regs, %s) += 2;\n", reg);
                break;
             case sz_long:
                printf ("\tm68k_areg(regs, %s) += 4;\n", reg);
                break;
             default:
                abort ();
            }
            break;
         case Apdi:
            printf ("\tm68k_areg (regs, %s) = %sa;\n", reg, name);
            break;
         default:
            break;
        }
}

static void genastore (char *from, amodes mode, char *reg, wordsizes size, char *to)
{
    switch (mode) {
     case Dreg:
        switch (size) {
         case sz_byte:
            printf ("\tm68k_dreg(regs, %s) = (m68k_dreg(regs, %s) & ~0xff) | ((%s) & 0xff);\n", reg, reg, from);
            break;
         case sz_word:
            printf ("\tm68k_dreg(regs, %s) = (m68k_dreg(regs, %s) & ~0xffff) | ((%s) & 0xffff);\n", reg, reg, from);
            break;
         case sz_long:
            printf ("\tm68k_dreg(regs, %s) = (%s);\n", reg, from);
            break;
         default:
            abort ();
        }
        break;
     case Areg:
        switch (size) {
         case sz_word:
            fprintf (stderr, "Foo\n");
            printf ("\tm68k_areg(regs, %s) = (uae_s32)(uae_s16)(%s);\n", reg, from);
            break;
         case sz_long:
            printf ("\tm68k_areg(regs, %s) = (%s);\n", reg, from);
            break;
         default:
            abort ();
        }
        break;
     case Aind:
     case Aipi:
     case Apdi:
     case Ad16:
     case Ad8r:
     case absw:
     case absl:
     case PC16:
     case PC8r:
        if (using_prefetch)
            sync_m68k_pc ();
        switch (size) {
         case sz_byte:
            insn_n_cycles += 2;
            printf ("\tput_byte(%sa,%s);\n", to, from);
            break;
         case sz_word:
            insn_n_cycles += 2;
            if (cpu_level < 2 && (mode == PC16 || mode == PC8r))
                abort ();
            printf ("\tput_word(%sa,%s);\n", to, from);
            break;
         case sz_long:
            insn_n_cycles += 4;
            if (cpu_level < 2 && (mode == PC16 || mode == PC8r))
                abort ();
            printf ("\tput_long(%sa,%s);\n", to, from);
            break;
         default:
            abort ();
        }
        break;
     case imm:
     case imm0:
     case imm1:
     case imm2:
     case immi:
        abort ();
        break;
     default:
        abort ();
    }
}

static void genmovemel (uae_u16 opcode)
{
    char getcode[100];
    int size = table68k[opcode].size == sz_long ? 4 : 2;

    if (table68k[opcode].size == sz_long) {
        strcpy (getcode, "get_long(srca)");
    } else {
        strcpy (getcode, "(uae_s32)(uae_s16)get_word(srca)");
    }

    printf ("\tuae_u16 mask = %s;\n", gen_nextiword ());
    printf ("\tunsigned int dmask = mask & 0xff, amask = (mask >> 8) & 0xff;\n");
    genamode (table68k[opcode].dmode, "dstreg", table68k[opcode].size, "src", 2, 1);
    start_brace ();
    printf ("\twhile (dmask) { m68k_dreg(regs, movem_index1[dmask]) = %s; srca += %d; dmask = movem_next[dmask]; }\n",
            getcode, size);
    printf ("\twhile (amask) { m68k_areg(regs, movem_index1[amask]) = %s; srca += %d; amask = movem_next[amask]; }\n",
            getcode, size);

    if (table68k[opcode].dmode == Aipi)
        printf ("\tm68k_areg(regs, dstreg) = srca;\n");
}

static void genmovemle (uae_u16 opcode)
{
    char putcode[100];
    int size = table68k[opcode].size == sz_long ? 4 : 2;
    if (table68k[opcode].size == sz_long) {
        strcpy (putcode, "put_long(srca,");
    } else {
        strcpy (putcode, "put_word(srca,");
    }

    printf ("\tuae_u16 mask = %s;\n", gen_nextiword ());
    genamode (table68k[opcode].dmode, "dstreg", table68k[opcode].size, "src", 2, 1);
    if (using_prefetch)
        sync_m68k_pc ();

    start_brace ();
    if (table68k[opcode].dmode == Apdi) {
        printf ("\tuae_u16 amask = mask & 0xff, dmask = (mask >> 8) & 0xff;\n");
        printf ("\twhile (amask) { srca -= %d; %s m68k_areg(regs, movem_index2[amask])); amask = movem_next[amask]; }\n",
                size, putcode);
        printf ("\twhile (dmask) { srca -= %d; %s m68k_dreg(regs, movem_index2[dmask])); dmask = movem_next[dmask]; }\n",
                size, putcode);
        printf ("\tm68k_areg(regs, dstreg) = srca;\n");
    } else {
        printf ("\tuae_u16 dmask = mask & 0xff, amask = (mask >> 8) & 0xff;\n");
        printf ("\twhile (dmask) { %s m68k_dreg(regs, movem_index1[dmask])); srca += %d; dmask = movem_next[dmask]; }\n",
                putcode, size);
        printf ("\twhile (amask) { %s m68k_areg(regs, movem_index1[amask])); srca += %d; amask = movem_next[amask]; }\n",
                putcode, size);
    }
}

static void duplicate_carry (void)
{
    printf ("\tCOPY_CARRY;\n");
}

typedef enum {
    flag_logical_noclobber, flag_logical, flag_add, flag_sub, flag_cmp, flag_addx, flag_subx, flag_zn,
    flag_av, flag_sv
} flagtypes;

static void genflags_normal (flagtypes type, wordsizes size, char *value, char *src, char *dst)
{
    char vstr[100], sstr[100], dstr[100];
    char usstr[100], udstr[100];
    char unsstr[100], undstr[100];

    switch (size) {
     case sz_byte:
        strcpy (vstr, "((uae_s8)(");
        strcpy (usstr, "((uae_u8)(");
        break;
     case sz_word:
        strcpy (vstr, "((uae_s16)(");
        strcpy (usstr, "((uae_u16)(");
        break;
     case sz_long:
        strcpy (vstr, "((uae_s32)(");
        strcpy (usstr, "((uae_u32)(");
        break;
     default:
        abort ();
    }
    strcpy (unsstr, usstr);

    strcpy (sstr, vstr);
    strcpy (dstr, vstr);
    strcat (vstr, value);
    strcat (vstr, "))");
    strcat (dstr, dst);
    strcat (dstr, "))");
    strcat (sstr, src);
    strcat (sstr, "))");

    strcpy (udstr, usstr);
    strcat (udstr, dst);
    strcat (udstr, "))");
    strcat (usstr, src);
    strcat (usstr, "))");

    strcpy (undstr, unsstr);
    strcat (unsstr, "-");
    strcat (undstr, "~");
    strcat (undstr, dst);
    strcat (undstr, "))");
    strcat (unsstr, src);
    strcat (unsstr, "))");

    switch (type) {
     case flag_logical_noclobber:
     case flag_logical:
     case flag_zn:
     case flag_av:
     case flag_sv:
     case flag_addx:
     case flag_subx:
        break;

     case flag_add:
        start_brace ();
        printf ("uae_u32 %s = %s + %s;\n", value, dstr, sstr);
        break;
     case flag_sub:
     case flag_cmp:
        start_brace ();
        printf ("uae_u32 %s = %s - %s;\n", value, dstr, sstr);
        break;
    }

    switch (type) {
     case flag_logical_noclobber:
     case flag_logical:
     case flag_zn:
        break;

     case flag_add:
     case flag_sub:
     case flag_addx:
     case flag_subx:
     case flag_cmp:
     case flag_av:
     case flag_sv:
        start_brace ();
        printf ("\t" BOOL_TYPE " flgs = %s < 0;\n", sstr);
        printf ("\t" BOOL_TYPE " flgo = %s < 0;\n", dstr);
        printf ("\t" BOOL_TYPE " flgn = %s < 0;\n", vstr);
        break;
    }

    switch (type) {
     case flag_logical:
        printf ("\tCLEAR_CZNV;\n");
        printf ("\tSET_ZFLG (%s == 0);\n", vstr);
        printf ("\tSET_NFLG (%s < 0);\n", vstr);
        break;
     case flag_logical_noclobber:
        printf ("\tSET_ZFLG (%s == 0);\n", vstr);
        printf ("\tSET_NFLG (%s < 0);\n", vstr);
        break;
     case flag_av:
        printf ("\tSET_VFLG ((flgs ^ flgn) & (flgo ^ flgn));\n");
        break;
     case flag_sv:
        printf ("\tSET_VFLG ((flgs ^ flgo) & (flgn ^ flgo));\n");
        break;
     case flag_zn:
        printf ("\tSET_ZFLG (GET_ZFLG & (%s == 0));\n", vstr);
        printf ("\tSET_NFLG (%s < 0);\n", vstr);
        break;
     case flag_add:
        printf ("\tSET_ZFLG (%s == 0);\n", vstr);
        printf ("\tSET_VFLG ((flgs ^ flgn) & (flgo ^ flgn));\n");
        printf ("\tSET_CFLG (%s < %s);\n", undstr, usstr);
        duplicate_carry ();
        printf ("\tSET_NFLG (flgn != 0);\n");
        break;
     case flag_sub:
        printf ("\tSET_ZFLG (%s == 0);\n", vstr);
        printf ("\tSET_VFLG ((flgs ^ flgo) & (flgn ^ flgo));\n");
        printf ("\tSET_CFLG (%s > %s);\n", usstr, udstr);
        duplicate_carry ();
        printf ("\tSET_NFLG (flgn != 0);\n");
        break;
     case flag_addx:
        printf ("\tSET_VFLG ((flgs ^ flgn) & (flgo ^ flgn));\n"); /* minterm SON: 0x42 */
        printf ("\tSET_CFLG (flgs ^ ((flgs ^ flgo) & (flgo ^ flgn)));\n"); /* minterm SON: 0xD4 */
        duplicate_carry ();
        break;
     case flag_subx:
        printf ("\tSET_VFLG ((flgs ^ flgo) & (flgo ^ flgn));\n"); /* minterm SON: 0x24 */
        printf ("\tSET_CFLG (flgs ^ ((flgs ^ flgn) & (flgo ^ flgn)));\n"); /* minterm SON: 0xB2 */
        duplicate_carry ();
        break;
     case flag_cmp:
        printf ("\tSET_ZFLG (%s == 0);\n", vstr);
        printf ("\tSET_VFLG ((flgs != flgo) && (flgn != flgo));\n");
        printf ("\tSET_CFLG (%s > %s);\n", usstr, udstr);
        printf ("\tSET_NFLG (flgn != 0);\n");
        break;
    }
}

static void genflags (flagtypes type, wordsizes size, char *value, char *src, char *dst)
{
    /* Temporarily deleted 68k/ARM flag optimizations.  I'd prefer to have
       them in the appropriate m68k.h files and use just one copy of this
       code here.  The API can be changed if necessary.  */
#ifdef OPTIMIZED_FLAGS
    switch (type) {
     case flag_add:
     case flag_sub:
        start_brace ();
        printf ("\tuae_u32 %s;\n", value);
        break;
     default:
        break;
    }

    /* At least some of those casts are fairly important! */
    switch (type) {
     case flag_logical_noclobber:
        printf ("\t{uae_u32 oldcznv = GET_CZNV & ~(FLAGVAL_Z | FLAGVAL_N);\n");
        if (strcmp (value, "0") == 0) {
            printf ("\tSET_CZNV (olcznv | FLAGVAL_Z);\n");
        } else {
            switch (size) {
             case sz_byte: printf ("\toptflag_testb ((uae_s8)(%s));\n", value); break;
             case sz_word: printf ("\toptflag_testw ((uae_s16)(%s));\n", value); break;
             case sz_long: printf ("\toptflag_testl ((uae_s32)(%s));\n", value); break;
            }
            printf ("\tIOR_CZNV (oldcznv);\n");
        }
        printf ("\t}\n");
        return;
        
     case flag_logical:
        if (strcmp (value, "0") == 0) {
            printf ("\tSET_CZNV (FLAGVAL_Z);\n");
        } else {
            switch (size) {
             case sz_byte: printf ("\toptflag_testb ((uae_s8)(%s));\n", value); break;
             case sz_word: printf ("\toptflag_testw ((uae_s16)(%s));\n", value); break;
             case sz_long: printf ("\toptflag_testl ((uae_s32)(%s));\n", value); break;
            }
        }
        return;

     case flag_add:
        switch (size) {
         case sz_byte: printf ("\toptflag_addb (%s, (uae_s8)(%s), (uae_s8)(%s));\n", value, src, dst); break;
         case sz_word: printf ("\toptflag_addw (%s, (uae_s16)(%s), (uae_s16)(%s));\n", value, src, dst); break;
         case sz_long: printf ("\toptflag_addl (%s, (uae_s32)(%s), (uae_s32)(%s));\n", value, src, dst); break;
        }
        return;

     case flag_sub:
        switch (size) {
         case sz_byte: printf ("\toptflag_subb (%s, (uae_s8)(%s), (uae_s8)(%s));\n", value, src, dst); break;
         case sz_word: printf ("\toptflag_subw (%s, (uae_s16)(%s), (uae_s16)(%s));\n", value, src, dst); break;
         case sz_long: printf ("\toptflag_subl (%s, (uae_s32)(%s), (uae_s32)(%s));\n", value, src, dst); break;
        }
        return;

     case flag_cmp:
        switch (size) {
         case sz_byte: printf ("\toptflag_cmpb ((uae_s8)(%s), (uae_s8)(%s));\n", src, dst); break;
         case sz_word: printf ("\toptflag_cmpw ((uae_s16)(%s), (uae_s16)(%s));\n", src, dst); break;
         case sz_long: printf ("\toptflag_cmpl ((uae_s32)(%s), (uae_s32)(%s));\n", src, dst); break;
        }
        return;
        
     default:
        break;
    }
#endif
    genflags_normal (type, size, value, src, dst);
}

static void force_range_for_rox (const char *var, wordsizes size)
{
    /* Could do a modulo operation here... which one is faster? */
    switch (size) {
     case sz_long:
        printf ("\tif (%s >= 33) %s -= 33;\n", var, var);
        break;
     case sz_word:
        printf ("\tif (%s >= 34) %s -= 34;\n", var, var);
        printf ("\tif (%s >= 17) %s -= 17;\n", var, var);
        break;
     case sz_byte:
        printf ("\tif (%s >= 36) %s -= 36;\n", var, var);
        printf ("\tif (%s >= 18) %s -= 18;\n", var, var);
        printf ("\tif (%s >= 9) %s -= 9;\n", var, var);
        break;
    }
}

static const char *cmask (wordsizes size)
{
    switch (size) {
     case sz_byte: return "0x80";
     case sz_word: return "0x8000";
     case sz_long: return "0x80000000";
     default: abort ();
    }
}

static int source_is_imm1_8 (struct instr *i)
{
    return i->stype == 3;
}

static const char * cflow_string_of(uae_u32 opcode)
{
        const char * cflow_type_str;
        
        int cflow_type = table68k[opcode].cflow & ~fl_trap;
        switch (cflow_type) {
                case fl_branch:         cflow_type_str = "CFLOW_BRANCH";                break;
                case fl_jump:           cflow_type_str = "CFLOW_JUMP";                  break;
                case fl_return:         cflow_type_str = "CFLOW_RETURN";                break;
                default:                        cflow_type_str = "CFLOW_NORMAL";
        }
        
        /* Patch M68K_EXEC_RETURN instruction */
        if (table68k[opcode].mnemo == i_EMULOP_RETURN)
                cflow_type_str = "CFLOW_EXEC_RETURN";
        
        return cflow_type_str;
}

static void gen_opcode (unsigned long int opcode)
{
    struct instr *curi = table68k + opcode;
    insn_n_cycles = 2;

    start_brace ();
#if 0
    printf ("uae_u8 *m68k_pc = regs.pc_p;\n");
#endif
    m68k_pc_offset = 2;
    switch (curi->plev) {
     case 0: /* not privileged */
        break;
     case 1: /* unprivileged only on 68000 */
        if (cpu_level == 0)
            break;
        if (next_cpu_level < 0)
            next_cpu_level = 0;

        /* fall through */
     case 2: /* priviledged */
        printf ("if (!regs.s) { Exception(8,0); goto %s; }\n", endlabelstr);
        need_endlabel = 1;
        start_brace ();
        break;
     case 3: /* privileged if size == word */
        if (curi->size == sz_byte)
            break;
        printf ("if (!regs.s) { Exception(8,0); goto %s; }\n", endlabelstr);
        need_endlabel = 1;
        start_brace ();
        break;
    }
    switch (curi->mnemo) {
     case i_OR:
     case i_AND:
     case i_EOR:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        printf ("\tsrc %c= dst;\n", curi->mnemo == i_OR ? '|' : curi->mnemo == i_AND ? '&' : '^');
        genflags (flag_logical, curi->size, "src", "", "");
        genastore ("src", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_ORSR:
     case i_EORSR:
        printf ("\tMakeSR();\n");
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        if (curi->size == sz_byte) {
            printf ("\tsrc &= 0xFF;\n");
        }
        printf ("\tregs.sr %c= src;\n", curi->mnemo == i_EORSR ? '^' : '|');
        printf ("\tMakeFromSR();\n");
        break;
     case i_ANDSR:
        printf ("\tMakeSR();\n");
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        if (curi->size == sz_byte) {
            printf ("\tsrc |= 0xFF00;\n");
        }
        printf ("\tregs.sr &= src;\n");
        printf ("\tMakeFromSR();\n");
        break;
     case i_SUB:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        genflags (flag_sub, curi->size, "newv", "src", "dst");
        genastore ("newv", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_SUBA:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_long, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = dst - src;\n");
        genastore ("newv", curi->dmode, "dstreg", sz_long, "dst");
        break;
     case i_SUBX:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = dst - src - (GET_XFLG ? 1 : 0);\n");
        genflags (flag_subx, curi->size, "newv", "src", "dst");
        genflags (flag_zn, curi->size, "newv", "", "");
        genastore ("newv", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_SBCD:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u16 newv_lo = (dst & 0xF) - (src & 0xF) - (GET_XFLG ? 1 : 0);\n");
        printf ("\tuae_u16 newv_hi = (dst & 0xF0) - (src & 0xF0);\n");
        printf ("\tuae_u16 newv, tmp_newv;\n");
        printf ("\tint bcd = 0;\n");
        printf ("\tnewv = tmp_newv = newv_hi + newv_lo;\n");
        printf ("\tif (newv_lo & 0xF0) { newv -= 6; bcd = 6; };\n");
        printf ("\tif ((((dst & 0xFF) - (src & 0xFF) - (GET_XFLG ? 1 : 0)) & 0x100) > 0xFF) { newv -= 0x60; }\n");
        printf ("\tSET_CFLG ((((dst & 0xFF) - (src & 0xFF) - bcd - (GET_XFLG ? 1 : 0)) & 0x300) > 0xFF);\n");
        duplicate_carry ();
        genflags (flag_zn, curi->size, "newv", "", "");
        printf ("\tSET_VFLG ((tmp_newv & 0x80) != 0 && (newv & 0x80) == 0);\n");
        genastore ("newv", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_ADD:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        genflags (flag_add, curi->size, "newv", "src", "dst");
        genastore ("newv", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_ADDA:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_long, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = dst + src;\n");
        genastore ("newv", curi->dmode, "dstreg", sz_long, "dst");
        break;
     case i_ADDX:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = dst + src + (GET_XFLG ? 1 : 0);\n");
        genflags (flag_addx, curi->size, "newv", "src", "dst");
        genflags (flag_zn, curi->size, "newv", "", "");
        genastore ("newv", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_ABCD:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u16 newv_lo = (src & 0xF) + (dst & 0xF) + (GET_XFLG ? 1 : 0);\n");
        printf ("\tuae_u16 newv_hi = (src & 0xF0) + (dst & 0xF0);\n");
        printf ("\tuae_u16 newv, tmp_newv;\n");
        printf ("\tint cflg;\n");
        printf ("\tnewv = tmp_newv = newv_hi + newv_lo;\n");
        printf ("\tif (newv_lo > 9) { newv += 6; }\n");
        printf ("\tcflg = (newv & 0x3F0) > 0x90;\n");
        printf ("\tif (cflg) newv += 0x60;\n");
        printf ("\tSET_CFLG (cflg);\n");
        duplicate_carry ();
        genflags (flag_zn, curi->size, "newv", "", "");
        printf ("\tSET_VFLG ((tmp_newv & 0x80) == 0 && (newv & 0x80) != 0);\n");
        genastore ("newv", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_NEG:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        start_brace ();
        genflags (flag_sub, curi->size, "dst", "src", "0");
        genastore ("dst", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_NEGX:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = 0 - src - (GET_XFLG ? 1 : 0);\n");
        genflags (flag_subx, curi->size, "newv", "src", "0");
        genflags (flag_zn, curi->size, "newv", "", "");
        genastore ("newv", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_NBCD:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        start_brace ();
        printf ("\tuae_u16 newv_lo = - (src & 0xF) - (GET_XFLG ? 1 : 0);\n");
        printf ("\tuae_u16 newv_hi = - (src & 0xF0);\n");
        printf ("\tuae_u16 newv;\n");
        printf ("\tint cflg;\n");
        printf ("\tif (newv_lo > 9) { newv_lo -= 6; }\n");
        printf ("\tnewv = newv_hi + newv_lo;\n");
        printf ("\tcflg = (newv & 0x1F0) > 0x90;\n");
        printf ("\tif (cflg) newv -= 0x60;\n");
        printf ("\tSET_CFLG (cflg);\n");
        duplicate_carry();
        genflags (flag_zn, curi->size, "newv", "", "");
        genastore ("newv", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_CLR:
        genamode (curi->smode, "srcreg", curi->size, "src", 2, 0);
        genflags (flag_logical, curi->size, "0", "", "");
        genastore ("0", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_NOT:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        start_brace ();
        printf ("\tuae_u32 dst = ~src;\n");
        genflags (flag_logical, curi->size, "dst", "", "");
        genastore ("dst", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_TST:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genflags (flag_logical, curi->size, "src", "", "");
        break;
     case i_BTST:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        if (curi->size == sz_byte)
            printf ("\tsrc &= 7;\n");
        else
            printf ("\tsrc &= 31;\n");
        printf ("\tSET_ZFLG (1 ^ ((dst >> src) & 1));\n");
        break;
     case i_BCHG:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        if (curi->size == sz_byte)
            printf ("\tsrc &= 7;\n");
        else
            printf ("\tsrc &= 31;\n");
        printf ("\tdst ^= (1 << src);\n");
        printf ("\tSET_ZFLG (((uae_u32)dst & (1 << src)) >> src);\n");
        genastore ("dst", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_BCLR:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        if (curi->size == sz_byte)
            printf ("\tsrc &= 7;\n");
        else
            printf ("\tsrc &= 31;\n");
        printf ("\tSET_ZFLG (1 ^ ((dst >> src) & 1));\n");
        printf ("\tdst &= ~(1 << src);\n");
        genastore ("dst", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_BSET:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        if (curi->size == sz_byte)
            printf ("\tsrc &= 7;\n");
        else
            printf ("\tsrc &= 31;\n");
        printf ("\tSET_ZFLG (1 ^ ((dst >> src) & 1));\n");
        printf ("\tdst |= (1 << src);\n");
        genastore ("dst", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_CMPM:
     case i_CMP:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        start_brace ();
        genflags (flag_cmp, curi->size, "newv", "src", "dst");
        break;
     case i_CMPA:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_long, "dst", 1, 0);
        start_brace ();
        genflags (flag_cmp, sz_long, "newv", "src", "dst");
        break;
        /* The next two are coded a little unconventional, but they are doing
         * weird things... */
     case i_MVPRM:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);

        printf ("\tuaecptr memp = m68k_areg(regs, dstreg) + (uae_s32)(uae_s16)%s;\n", gen_nextiword ());
        if (curi->size == sz_word) {
            printf ("\tput_byte(memp, src >> 8); put_byte(memp + 2, src);\n");
        } else {
            printf ("\tput_byte(memp, src >> 24); put_byte(memp + 2, src >> 16);\n");
            printf ("\tput_byte(memp + 4, src >> 8); put_byte(memp + 6, src);\n");
        }
        break;
     case i_MVPMR:
        printf ("\tuaecptr memp = m68k_areg(regs, srcreg) + (uae_s32)(uae_s16)%s;\n", gen_nextiword ());
        genamode (curi->dmode, "dstreg", curi->size, "dst", 2, 0);
        if (curi->size == sz_word) {
            printf ("\tuae_u16 val = (get_byte(memp) << 8) + get_byte(memp + 2);\n");
        } else {
            printf ("\tuae_u32 val = (get_byte(memp) << 24) + (get_byte(memp + 2) << 16)\n");
            printf ("              + (get_byte(memp + 4) << 8) + get_byte(memp + 6);\n");
        }
        genastore ("val", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_MOVE:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 2, 0);
        genflags (flag_logical, curi->size, "src", "", "");
        genastore ("src", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_MOVEA:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 2, 0);
        if (curi->size == sz_word) {
            printf ("\tuae_u32 val = (uae_s32)(uae_s16)src;\n");
        } else {
            printf ("\tuae_u32 val = src;\n");
        }
        genastore ("val", curi->dmode, "dstreg", sz_long, "dst");
        break;
     case i_MVSR2:
        genamode (curi->smode, "srcreg", sz_word, "src", 2, 0);
        printf ("\tMakeSR();\n");
        if (curi->size == sz_byte)
            genastore ("regs.sr & 0xff", curi->smode, "srcreg", sz_word, "src");
        else
            genastore ("regs.sr", curi->smode, "srcreg", sz_word, "src");
        break;
     case i_MV2SR:
        genamode (curi->smode, "srcreg", sz_word, "src", 1, 0);
        if (curi->size == sz_byte)
            printf ("\tMakeSR();\n\tregs.sr &= 0xFF00;\n\tregs.sr |= src & 0xFF;\n");
        else {
            printf ("\tregs.sr = src;\n");
        }
        printf ("\tMakeFromSR();\n");
        break;
     case i_SWAP:
        genamode (curi->smode, "srcreg", sz_long, "src", 1, 0);
        start_brace ();
        printf ("\tuae_u32 dst = ((src >> 16)&0xFFFF) | ((src&0xFFFF)<<16);\n");
        genflags (flag_logical, sz_long, "dst", "", "");
        genastore ("dst", curi->smode, "srcreg", sz_long, "src");
        break;
     case i_EXG:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        genastore ("dst", curi->smode, "srcreg", curi->size, "src");
        genastore ("src", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_EXT:
        genamode (curi->smode, "srcreg", sz_long, "src", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 dst = (uae_s32)(uae_s8)src;\n"); break;
         case sz_word: printf ("\tuae_u16 dst = (uae_s16)(uae_s8)src;\n"); break;
         case sz_long: printf ("\tuae_u32 dst = (uae_s32)(uae_s16)src;\n"); break;
         default: abort ();
        }
        genflags (flag_logical,
                  curi->size == sz_word ? sz_word : sz_long, "dst", "", "");
        genastore ("dst", curi->smode, "srcreg",
                   curi->size == sz_word ? sz_word : sz_long, "src");
        break;
     case i_MVMEL:
        genmovemel (opcode);
        break;
     case i_MVMLE:
        genmovemle (opcode);
        break;
     case i_TRAP:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        sync_m68k_pc ();
        printf ("\tException(src+32,0);\n");
        m68k_pc_offset = 0;
        break;
     case i_MVR2USP:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        printf ("\tregs.usp = src;\n");
        break;
     case i_MVUSP2R:
        genamode (curi->smode, "srcreg", curi->size, "src", 2, 0);
        genastore ("regs.usp", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_RESET:
        break;
     case i_NOP:
        break;
     case i_STOP:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        printf ("\tregs.sr = src;\n");
        printf ("\tMakeFromSR();\n");
        printf ("\tm68k_setstopped(1);\n");
        break;
     case i_RTE:
        if (cpu_level == 0) {
            genamode (Aipi, "7", sz_word, "sr", 1, 0);
            genamode (Aipi, "7", sz_long, "pc", 1, 0);
            printf ("\tregs.sr = sr; m68k_setpc_rte(pc);\n");
            fill_prefetch_0 ();
            printf ("\tMakeFromSR();\n");
        } else {
            int old_brace_level = n_braces;
            if (next_cpu_level < 0)
                next_cpu_level = 0;
            printf ("\tuae_u16 newsr; uae_u32 newpc; for (;;) {\n");
            genamode (Aipi, "7", sz_word, "sr", 1, 0);
            genamode (Aipi, "7", sz_long, "pc", 1, 0);
            genamode (Aipi, "7", sz_word, "format", 1, 0);
            printf ("\tnewsr = sr; newpc = pc;\n");
            printf ("\tif ((format & 0xF000) == 0x0000) { break; }\n");
            printf ("\telse if ((format & 0xF000) == 0x1000) { ; }\n");
            printf ("\telse if ((format & 0xF000) == 0x2000) { m68k_areg(regs, 7) += 4; break; }\n");
            /* gb-- the next two lines are deleted in Bernie's gencpu.c */
            printf ("\telse if ((format & 0xF000) == 0x3000) { m68k_areg(regs, 7) += 4; break; }\n");
            printf ("\telse if ((format & 0xF000) == 0x7000) { m68k_areg(regs, 7) += 52; break; }\n");
            printf ("\telse if ((format & 0xF000) == 0x8000) { m68k_areg(regs, 7) += 50; break; }\n");
            printf ("\telse if ((format & 0xF000) == 0x9000) { m68k_areg(regs, 7) += 12; break; }\n");
            printf ("\telse if ((format & 0xF000) == 0xa000) { m68k_areg(regs, 7) += 24; break; }\n");
            printf ("\telse if ((format & 0xF000) == 0xb000) { m68k_areg(regs, 7) += 84; break; }\n");
            printf ("\telse { Exception(14,0); goto %s; }\n", endlabelstr);
            printf ("\tregs.sr = newsr; MakeFromSR();\n}\n");
            pop_braces (old_brace_level);
            printf ("\tregs.sr = newsr; MakeFromSR();\n");
            printf ("\tm68k_setpc_rte(newpc);\n");
            fill_prefetch_0 ();
            need_endlabel = 1;
        }
        /* PC is set and prefetch filled. */
        m68k_pc_offset = 0;
        break;
     case i_RTD:
        genamode (Aipi, "7", sz_long, "pc", 1, 0);
        genamode (curi->smode, "srcreg", curi->size, "offs", 1, 0);
        printf ("\tm68k_areg(regs, 7) += offs;\n");
        printf ("\tm68k_setpc_rte(pc);\n");
        fill_prefetch_0 ();
        /* PC is set and prefetch filled. */
        m68k_pc_offset = 0;
        break;
     case i_LINK:
        genamode (Apdi, "7", sz_long, "old", 2, 0);
        genamode (curi->smode, "srcreg", sz_long, "src", 1, 0);
        genastore ("src", Apdi, "7", sz_long, "old");
        genastore ("m68k_areg(regs, 7)", curi->smode, "srcreg", sz_long, "src");
        genamode (curi->dmode, "dstreg", curi->size, "offs", 1, 0);
        printf ("\tm68k_areg(regs, 7) += offs;\n");
        break;
     case i_UNLK:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        printf ("\tm68k_areg(regs, 7) = src;\n");
        genamode (Aipi, "7", sz_long, "old", 1, 0);
        genastore ("old", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_RTS:
        printf ("\tm68k_do_rts();\n");
        fill_prefetch_0 ();
        m68k_pc_offset = 0;
        break;
     case i_TRAPV:
        sync_m68k_pc ();
        printf ("\tif (GET_VFLG) { Exception(7,m68k_getpc()); goto %s; }\n", endlabelstr);
        need_endlabel = 1;
        break;
     case i_RTR:
        printf ("\tMakeSR();\n");
        genamode (Aipi, "7", sz_word, "sr", 1, 0);
        genamode (Aipi, "7", sz_long, "pc", 1, 0);
        printf ("\tregs.sr &= 0xFF00; sr &= 0xFF;\n");
        printf ("\tregs.sr |= sr; m68k_setpc(pc);\n");
        fill_prefetch_0 ();
        printf ("\tMakeFromSR();\n");
        m68k_pc_offset = 0;
        break;
     case i_JSR:
        genamode (curi->smode, "srcreg", curi->size, "src", 0, 0);
        printf ("\tm68k_do_jsr(m68k_getpc() + %d, srca);\n", m68k_pc_offset);
        fill_prefetch_0 ();
        m68k_pc_offset = 0;
        break;
     case i_JMP:
        genamode (curi->smode, "srcreg", curi->size, "src", 0, 0);
        printf ("\tm68k_setpc(srca);\n");
        fill_prefetch_0 ();
        m68k_pc_offset = 0;
        break;
     case i_BSR:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        printf ("\tuae_s32 s = (uae_s32)src + 2;\n");
        if (using_exception_3) {
            printf ("\tif (src & 1) {\n");
            printf ("\tlast_addr_for_exception_3 = m68k_getpc() + 2;\n");
            printf ("\t\tlast_fault_for_exception_3 = m68k_getpc() + s;\n");
            printf ("\t\tlast_op_for_exception_3 = opcode; Exception(3,0); goto %s;\n", endlabelstr);
            printf ("\t}\n");
            need_endlabel = 1;
        }
        printf ("\tm68k_do_bsr(m68k_getpc() + %d, s);\n", m68k_pc_offset);
        fill_prefetch_0 ();
        m68k_pc_offset = 0;
        break;
     case i_Bcc:
        if (0 && !using_prefetch && !using_exception_3 && (cpu_level >= 2)) {
        /* gb-- variant probably more favorable to compiler optimizations
                    also assumes no prefetch buffer is used
        Hmm, that would make sense with processors capable of conditional moves */
        if (curi->size == sz_long && next_cpu_level < 1)
                next_cpu_level = 1;
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        printf ("\tm68k_incpc (cctrue(%d) ? ((uae_s32)src + 2) : %d);\n", curi->cc, m68k_pc_offset);
        m68k_pc_offset = 0;
        }
        else {
        /* original code for branch instructions */
        if (curi->size == sz_long) {
            if (cpu_level < 2) {
                printf ("\tm68k_incpc(2);\n");
                printf ("\tif (!cctrue(%d)) goto %s;\n", curi->cc, endlabelstr);
                printf ("\t\tlast_addr_for_exception_3 = m68k_getpc() + 2;\n");
                printf ("\t\tlast_fault_for_exception_3 = m68k_getpc() + 1;\n");
                printf ("\t\tlast_op_for_exception_3 = opcode; Exception(3,0); goto %s;\n", endlabelstr);
                need_endlabel = 1;
            } else {
                if (next_cpu_level < 1)
                    next_cpu_level = 1;
            }
        }
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        printf ("\tif (!cctrue(%d)) goto didnt_jump;\n", curi->cc);
        if (using_exception_3) {
            printf ("\tif (src & 1) {\n");
            printf ("\t\tlast_addr_for_exception_3 = m68k_getpc() + 2;\n");
            printf ("\t\tlast_fault_for_exception_3 = m68k_getpc() + 2 + (uae_s32)src;\n");
            printf ("\t\tlast_op_for_exception_3 = opcode; Exception(3,0); goto %s;\n", endlabelstr);
            printf ("\t}\n");
            need_endlabel = 1;
        }
        printf ("\tm68k_incpc ((uae_s32)src + 2);\n");
        fill_prefetch_0 ();
        printf ("cpuop_return(%s);\n", cflow_string_of(opcode));
        printf ("didnt_jump:;\n");
        need_endlabel = 1;
        }
        break;
     case i_LEA:
        genamode (curi->smode, "srcreg", curi->size, "src", 0, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 2, 0);
        genastore ("srca", curi->dmode, "dstreg", curi->size, "dst");
        break;
     case i_PEA:
        genamode (curi->smode, "srcreg", curi->size, "src", 0, 0);
        genamode (Apdi, "7", sz_long, "dst", 2, 0);
        genastore ("srca", Apdi, "7", sz_long, "dst");
        break;
     case i_DBcc:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "offs", 1, 0);

        printf ("\tif (!cctrue(%d)) {\n", curi->cc);
        genastore ("(src-1)", curi->smode, "srcreg", curi->size, "src");

        printf ("\t\tif (src) {\n");
        if (using_exception_3) {
            printf ("\t\t\tif (offs & 1) {\n");
            printf ("\t\t\tlast_addr_for_exception_3 = m68k_getpc() + 2;\n");
            printf ("\t\t\tlast_fault_for_exception_3 = m68k_getpc() + 2 + (uae_s32)offs + 2;\n");
            printf ("\t\t\tlast_op_for_exception_3 = opcode; Exception(3,0); goto %s;\n", endlabelstr);
            printf ("\t\t}\n");
            need_endlabel = 1;
        }
        printf ("\t\t\tm68k_incpc((uae_s32)offs + 2);\n");
        fill_prefetch_0 ();
        printf ("cpuop_return(%s);\n", cflow_string_of(opcode));
        printf ("\t\t}\n");
        printf ("\t}\n");
        need_endlabel = 1;
        break;
     case i_Scc:
        genamode (curi->smode, "srcreg", curi->size, "src", 2, 0);
        start_brace ();
        printf ("\tint val = cctrue(%d) ? 0xff : 0;\n", curi->cc);
        genastore ("val", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_DIVU:
        printf ("\tuaecptr oldpc = m68k_getpc();\n");
        genamode (curi->smode, "srcreg", sz_word, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_long, "dst", 1, 0);
        sync_m68k_pc ();
        /* Clear V flag when dividing by zero - Alcatraz Odyssey demo depends
         * on this (actually, it's doing a DIVS).  */
        printf ("\tif (src == 0) { SET_VFLG (0); Exception (5, oldpc); goto %s; } else {\n", endlabelstr);
        printf ("\tuae_u32 newv = (uae_u32)dst / (uae_u32)(uae_u16)src;\n");
        printf ("\tuae_u32 rem = (uae_u32)dst %% (uae_u32)(uae_u16)src;\n");
        /* The N flag appears to be set each time there is an overflow.
         * Weird. */
        printf ("\tif (newv > 0xffff) { SET_VFLG (1); SET_NFLG (1); SET_CFLG (0); } else\n\t{\n");
        genflags (flag_logical, sz_word, "newv", "", "");
        printf ("\tnewv = (newv & 0xffff) | ((uae_u32)rem << 16);\n");
        genastore ("newv", curi->dmode, "dstreg", sz_long, "dst");
        printf ("\t}\n");
        printf ("\t}\n");
        insn_n_cycles += 68;
        need_endlabel = 1;
        break;
     case i_DIVS:
        printf ("\tuaecptr oldpc = m68k_getpc();\n");
        genamode (curi->smode, "srcreg", sz_word, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_long, "dst", 1, 0);
        sync_m68k_pc ();
        printf ("\tif (src == 0) { SET_VFLG (0); Exception(5,oldpc); goto %s; } else {\n", endlabelstr);
        printf ("\tuae_s32 newv = (uae_s32)dst / (uae_s32)(uae_s16)src;\n");
        printf ("\tuae_u16 rem = (uae_s32)dst %% (uae_s32)(uae_s16)src;\n");
        printf ("\tif ((newv & 0xffff8000) != 0 && (newv & 0xffff8000) != 0xffff8000) { SET_VFLG (1); SET_NFLG (1); SET_CFLG (0); } else\n\t{\n");
        printf ("\tif (((uae_s16)rem < 0) != ((uae_s32)dst < 0)) rem = -rem;\n");
        genflags (flag_logical, sz_word, "newv", "", "");
        printf ("\tnewv = (newv & 0xffff) | ((uae_u32)rem << 16);\n");
        genastore ("newv", curi->dmode, "dstreg", sz_long, "dst");
        printf ("\t}\n");
        printf ("\t}\n");
        insn_n_cycles += 72;
        need_endlabel = 1;
        break;
     case i_MULU:
        genamode (curi->smode, "srcreg", sz_word, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_word, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = (uae_u32)(uae_u16)dst * (uae_u32)(uae_u16)src;\n");
        genflags (flag_logical, sz_long, "newv", "", "");
        genastore ("newv", curi->dmode, "dstreg", sz_long, "dst");
        insn_n_cycles += 32;
        break;
     case i_MULS:
        genamode (curi->smode, "srcreg", sz_word, "src", 1, 0);
        genamode (curi->dmode, "dstreg", sz_word, "dst", 1, 0);
        start_brace ();
        printf ("\tuae_u32 newv = (uae_s32)(uae_s16)dst * (uae_s32)(uae_s16)src;\n");
        genflags (flag_logical, sz_long, "newv", "", "");
        genastore ("newv", curi->dmode, "dstreg", sz_long, "dst");
        insn_n_cycles += 32;
        break;
     case i_CHK:
        printf ("\tuaecptr oldpc = m68k_getpc();\n");
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        printf ("\tif ((uae_s32)dst < 0) { SET_NFLG (1); Exception(6,oldpc); goto %s; }\n", endlabelstr);
        printf ("\telse if (dst > src) { SET_NFLG (0); Exception(6,oldpc); goto %s; }\n", endlabelstr);
        need_endlabel = 1;
        break;

     case i_CHK2:
        printf ("\tuaecptr oldpc = m68k_getpc();\n");
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 2, 0);
        printf ("\t{uae_s32 upper,lower,reg = regs.regs[(extra >> 12) & 15];\n");
        switch (curi->size) {
         case sz_byte:
            printf ("\tlower=(uae_s32)(uae_s8)get_byte(dsta); upper = (uae_s32)(uae_s8)get_byte(dsta+1);\n");
            printf ("\tif ((extra & 0x8000) == 0) reg = (uae_s32)(uae_s8)reg;\n");
            break;
         case sz_word:
            printf ("\tlower=(uae_s32)(uae_s16)get_word(dsta); upper = (uae_s32)(uae_s16)get_word(dsta+2);\n");
            printf ("\tif ((extra & 0x8000) == 0) reg = (uae_s32)(uae_s16)reg;\n");
            break;
         case sz_long:
            printf ("\tlower=get_long(dsta); upper = get_long(dsta+4);\n");
            break;
         default:
            abort ();
        }
        printf ("\tSET_ZFLG (upper == reg || lower == reg);\n");
        printf ("\tSET_CFLG_ALWAYS (lower <= upper ? reg < lower || reg > upper : reg > upper || reg < lower);\n");
        printf ("\tif ((extra & 0x800) && GET_CFLG) { Exception(6,oldpc); goto %s; }\n}\n", endlabelstr);
        need_endlabel = 1;
        break;

     case i_ASR:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 sign = (%s & val) >> %d;\n", cmask (curi->size), bit_size (curi->size) - 1);
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        printf ("\tif (cnt >= %d) {\n", bit_size (curi->size));
        printf ("\t\tval = %s & (uae_u32)-sign;\n", bit_mask (curi->size));
        printf ("\t\tSET_CFLG (sign);\n");
        duplicate_carry ();
        if (source_is_imm1_8 (curi))
            printf ("\t} else {\n");
        else
            printf ("\t} else if (cnt > 0) {\n");
        printf ("\t\tval >>= cnt - 1;\n");
        printf ("\t\tSET_CFLG (val & 1);\n");
        duplicate_carry ();
        printf ("\t\tval >>= 1;\n");
        printf ("\t\tval |= (%s << (%d - cnt)) & (uae_u32)-sign;\n",
                bit_mask (curi->size),
                bit_size (curi->size));
        printf ("\t\tval &= %s;\n", bit_mask (curi->size));
        printf ("\t}\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_ASL:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        printf ("\tif (cnt >= %d) {\n", bit_size (curi->size));
        printf ("\t\tSET_VFLG (val != 0);\n");
        printf ("\t\tSET_CFLG (cnt == %d ? val & 1 : 0);\n",
                bit_size (curi->size));
        duplicate_carry ();
        printf ("\t\tval = 0;\n");
        if (source_is_imm1_8 (curi))
            printf ("\t} else {\n");
        else
            printf ("\t} else if (cnt > 0) {\n");
        printf ("\t\tuae_u32 mask = (%s << (%d - cnt)) & %s;\n",
                bit_mask (curi->size),
                bit_size (curi->size) - 1,
                bit_mask (curi->size));
        printf ("\t\tSET_VFLG ((val & mask) != mask && (val & mask) != 0);\n");
        printf ("\t\tval <<= cnt - 1;\n");
        printf ("\t\tSET_CFLG ((val & %s) >> %d);\n", cmask (curi->size), bit_size (curi->size) - 1);
        duplicate_carry ();
        printf ("\t\tval <<= 1;\n");
        printf ("\t\tval &= %s;\n", bit_mask (curi->size));
        printf ("\t}\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_LSR:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        printf ("\tif (cnt >= %d) {\n", bit_size (curi->size));
        printf ("\t\tSET_CFLG ((cnt == %d) & (val >> %d));\n",
                bit_size (curi->size), bit_size (curi->size) - 1);
        duplicate_carry ();
        printf ("\t\tval = 0;\n");
        if (source_is_imm1_8 (curi))
            printf ("\t} else {\n");
        else
            printf ("\t} else if (cnt > 0) {\n");
        printf ("\t\tval >>= cnt - 1;\n");
        printf ("\t\tSET_CFLG (val & 1);\n");
        duplicate_carry ();
        printf ("\t\tval >>= 1;\n");
        printf ("\t}\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_LSL:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        printf ("\tif (cnt >= %d) {\n", bit_size (curi->size));
        printf ("\t\tSET_CFLG (cnt == %d ? val & 1 : 0);\n",
                bit_size (curi->size));
        duplicate_carry ();
        printf ("\t\tval = 0;\n");
        if (source_is_imm1_8 (curi))
            printf ("\t} else {\n");
        else
            printf ("\t} else if (cnt > 0) {\n");
        printf ("\t\tval <<= (cnt - 1);\n");
        printf ("\t\tSET_CFLG ((val & %s) >> %d);\n", cmask (curi->size), bit_size (curi->size) - 1);
        duplicate_carry ();
        printf ("\t\tval <<= 1;\n");
        printf ("\tval &= %s;\n", bit_mask (curi->size));
        printf ("\t}\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_ROL:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        if (source_is_imm1_8 (curi))
            printf ("{");
        else
            printf ("\tif (cnt > 0) {\n");
        printf ("\tuae_u32 loval;\n");
        printf ("\tcnt &= %d;\n", bit_size (curi->size) - 1);
        printf ("\tloval = val >> (%d - cnt);\n", bit_size (curi->size));
        printf ("\tval <<= cnt;\n");
        printf ("\tval |= loval;\n");
        printf ("\tval &= %s;\n", bit_mask (curi->size));
        printf ("\tSET_CFLG (val & 1);\n");
        printf ("}\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_ROR:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        if (source_is_imm1_8 (curi))
            printf ("{");
        else
            printf ("\tif (cnt > 0) {");
        printf ("\tuae_u32 hival;\n");
        printf ("\tcnt &= %d;\n", bit_size (curi->size) - 1);
        printf ("\thival = val << (%d - cnt);\n", bit_size (curi->size));
        printf ("\tval >>= cnt;\n");
        printf ("\tval |= hival;\n");
        printf ("\tval &= %s;\n", bit_mask (curi->size));
        printf ("\tSET_CFLG ((val & %s) >> %d);\n", cmask (curi->size), bit_size (curi->size) - 1);
        printf ("\t}\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_ROXL:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        if (source_is_imm1_8 (curi))
            printf ("{");
        else {
            force_range_for_rox ("cnt", curi->size);
            printf ("\tif (cnt > 0) {\n");
        }
        printf ("\tcnt--;\n");
        printf ("\t{\n\tuae_u32 carry;\n");
        printf ("\tuae_u32 loval = val >> (%d - cnt);\n", bit_size (curi->size) - 1);
        printf ("\tcarry = loval & 1;\n");
        printf ("\tval = (((val << 1) | GET_XFLG) << cnt) | (loval >> 1);\n");
        printf ("\tSET_XFLG (carry);\n");
        printf ("\tval &= %s;\n", bit_mask (curi->size));
        printf ("\t} }\n");
        printf ("\tSET_CFLG (GET_XFLG);\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_ROXR:
        genamode (curi->smode, "srcreg", curi->size, "cnt", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tcnt &= 63;\n");
        printf ("\tCLEAR_CZNV;\n");
        if (source_is_imm1_8 (curi))
            printf ("{");
        else {
            force_range_for_rox ("cnt", curi->size);
            printf ("\tif (cnt > 0) {\n");
        }
        printf ("\tcnt--;\n");
        printf ("\t{\n\tuae_u32 carry;\n");
        printf ("\tuae_u32 hival = (val << 1) | GET_XFLG;\n");
        printf ("\thival <<= (%d - cnt);\n", bit_size (curi->size) - 1);
        printf ("\tval >>= cnt;\n");
        printf ("\tcarry = val & 1;\n");
        printf ("\tval >>= 1;\n");
        printf ("\tval |= hival;\n");
        printf ("\tSET_XFLG (carry);\n");
        printf ("\tval &= %s;\n", bit_mask (curi->size));
        printf ("\t} }\n");
        printf ("\tSET_CFLG (GET_XFLG);\n");
        genflags (flag_logical_noclobber, curi->size, "val", "", "");
        genastore ("val", curi->dmode, "dstreg", curi->size, "data");
        break;
     case i_ASRW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 sign = %s & val;\n", cmask (curi->size));
        printf ("\tuae_u32 cflg = val & 1;\n");
        printf ("\tval = (val >> 1) | sign;\n");
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("\tSET_CFLG (cflg);\n");
        duplicate_carry ();
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_ASLW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 sign = %s & val;\n", cmask (curi->size));
        printf ("\tuae_u32 sign2;\n");
        printf ("\tval <<= 1;\n");
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("\tsign2 = %s & val;\n", cmask (curi->size));
        printf ("\tSET_CFLG (sign != 0);\n");
        duplicate_carry ();

        printf ("\tSET_VFLG (GET_VFLG | (sign2 != sign));\n");
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_LSRW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u32 val = (uae_u8)data;\n"); break;
         case sz_word: printf ("\tuae_u32 val = (uae_u16)data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 carry = val & 1;\n");
        printf ("\tval >>= 1;\n");
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("SET_CFLG (carry);\n");
        duplicate_carry ();
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_LSLW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u8 val = data;\n"); break;
         case sz_word: printf ("\tuae_u16 val = data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 carry = val & %s;\n", cmask (curi->size));
        printf ("\tval <<= 1;\n");
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("SET_CFLG (carry >> %d);\n", bit_size (curi->size) - 1);
        duplicate_carry ();
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_ROLW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u8 val = data;\n"); break;
         case sz_word: printf ("\tuae_u16 val = data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 carry = val & %s;\n", cmask (curi->size));
        printf ("\tval <<= 1;\n");
        printf ("\tif (carry)  val |= 1;\n");
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("SET_CFLG (carry >> %d);\n", bit_size (curi->size) - 1);
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_RORW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u8 val = data;\n"); break;
         case sz_word: printf ("\tuae_u16 val = data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 carry = val & 1;\n");
        printf ("\tval >>= 1;\n");
        printf ("\tif (carry) val |= %s;\n", cmask (curi->size));
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("SET_CFLG (carry);\n");
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_ROXLW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u8 val = data;\n"); break;
         case sz_word: printf ("\tuae_u16 val = data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 carry = val & %s;\n", cmask (curi->size));
        printf ("\tval <<= 1;\n");
        printf ("\tif (GET_XFLG) val |= 1;\n");
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("SET_CFLG (carry >> %d);\n", bit_size (curi->size) - 1);
        duplicate_carry ();
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_ROXRW:
        genamode (curi->smode, "srcreg", curi->size, "data", 1, 0);
        start_brace ();
        switch (curi->size) {
         case sz_byte: printf ("\tuae_u8 val = data;\n"); break;
         case sz_word: printf ("\tuae_u16 val = data;\n"); break;
         case sz_long: printf ("\tuae_u32 val = data;\n"); break;
         default: abort ();
        }
        printf ("\tuae_u32 carry = val & 1;\n");
        printf ("\tval >>= 1;\n");
        printf ("\tif (GET_XFLG) val |= %s;\n", cmask (curi->size));
        genflags (flag_logical, curi->size, "val", "", "");
        printf ("SET_CFLG (carry);\n");
        duplicate_carry ();
        genastore ("val", curi->smode, "srcreg", curi->size, "data");
        break;
     case i_MOVEC2:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        start_brace ();
        printf ("\tint regno = (src >> 12) & 15;\n");
        printf ("\tuae_u32 *regp = regs.regs + regno;\n");
        printf ("\tif (! m68k_movec2(src & 0xFFF, regp)) goto %s;\n", endlabelstr);
        break;
     case i_MOVE2C:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        start_brace ();
        printf ("\tint regno = (src >> 12) & 15;\n");
        printf ("\tuae_u32 *regp = regs.regs + regno;\n");
        printf ("\tif (! m68k_move2c(src & 0xFFF, regp)) goto %s;\n", endlabelstr);
        break;
     case i_CAS:
        {
            int old_brace_level;
            genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace ();
            printf ("\tint ru = (src >> 6) & 7;\n");
            printf ("\tint rc = src & 7;\n");
            genflags (flag_cmp, curi->size, "newv", "m68k_dreg(regs, rc)", "dst");
            printf ("\tif (GET_ZFLG)");
            old_brace_level = n_braces;
            start_brace ();
            genastore ("(m68k_dreg(regs, ru))", curi->dmode, "dstreg", curi->size, "dst");
            pop_braces (old_brace_level);
            printf ("else");
            start_brace ();
            printf ("m68k_dreg(regs, rc) = dst;\n");
            pop_braces (old_brace_level);
        }
        break;
     case i_CAS2:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        printf ("\tuae_u32 rn1 = regs.regs[(extra >> 28) & 15];\n");
        printf ("\tuae_u32 rn2 = regs.regs[(extra >> 12) & 15];\n");
        if (curi->size == sz_word) {
            int old_brace_level = n_braces;
            printf ("\tuae_u16 dst1 = get_word(rn1), dst2 = get_word(rn2);\n");
            genflags (flag_cmp, curi->size, "newv", "m68k_dreg(regs, (extra >> 16) & 7)", "dst1");
            printf ("\tif (GET_ZFLG) {\n");
            genflags (flag_cmp, curi->size, "newv", "m68k_dreg(regs, extra & 7)", "dst2");
            printf ("\tif (GET_ZFLG) {\n");
            printf ("\tput_word(rn1, m68k_dreg(regs, (extra >> 22) & 7));\n");
            printf ("\tput_word(rn1, m68k_dreg(regs, (extra >> 6) & 7));\n");
            printf ("\t}}\n");
            pop_braces (old_brace_level);
            printf ("\tif (! GET_ZFLG) {\n");
            printf ("\tm68k_dreg(regs, (extra >> 22) & 7) = (m68k_dreg(regs, (extra >> 22) & 7) & ~0xffff) | (dst1 & 0xffff);\n");
            printf ("\tm68k_dreg(regs, (extra >> 6) & 7) = (m68k_dreg(regs, (extra >> 6) & 7) & ~0xffff) | (dst2 & 0xffff);\n");
            printf ("\t}\n");
        } else {
            int old_brace_level = n_braces;
            printf ("\tuae_u32 dst1 = get_long(rn1), dst2 = get_long(rn2);\n");
            genflags (flag_cmp, curi->size, "newv", "m68k_dreg(regs, (extra >> 16) & 7)", "dst1");
            printf ("\tif (GET_ZFLG) {\n");
            genflags (flag_cmp, curi->size, "newv", "m68k_dreg(regs, extra & 7)", "dst2");
            printf ("\tif (GET_ZFLG) {\n");
            printf ("\tput_long(rn1, m68k_dreg(regs, (extra >> 22) & 7));\n");
            printf ("\tput_long(rn1, m68k_dreg(regs, (extra >> 6) & 7));\n");
            printf ("\t}}\n");
            pop_braces (old_brace_level);
            printf ("\tif (! GET_ZFLG) {\n");
            printf ("\tm68k_dreg(regs, (extra >> 22) & 7) = dst1;\n");
            printf ("\tm68k_dreg(regs, (extra >> 6) & 7) = dst2;\n");
            printf ("\t}\n");
        }
        break;
     case i_MOVES:              /* ignore DFC and SFC because we have no MMU */
        {
            int old_brace_level;
            genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
            printf ("\tif (extra & 0x800)\n");
            old_brace_level = n_braces;
            start_brace ();
            printf ("\tuae_u32 src = regs.regs[(extra >> 12) & 15];\n");
            genamode (curi->dmode, "dstreg", curi->size, "dst", 2, 0);
            genastore ("src", curi->dmode, "dstreg", curi->size, "dst");
            pop_braces (old_brace_level);
            printf ("else");
            start_brace ();
            genamode (curi->dmode, "dstreg", curi->size, "src", 1, 0);
            printf ("\tif (extra & 0x8000) {\n");
            switch (curi->size) {
             case sz_byte: printf ("\tm68k_areg(regs, (extra >> 12) & 7) = (uae_s32)(uae_s8)src;\n"); break;
             case sz_word: printf ("\tm68k_areg(regs, (extra >> 12) & 7) = (uae_s32)(uae_s16)src;\n"); break;
             case sz_long: printf ("\tm68k_areg(regs, (extra >> 12) & 7) = src;\n"); break;
             default: abort ();
            }
            printf ("\t} else {\n");
            genastore ("src", Dreg, "(extra >> 12) & 7", curi->size, "");
            printf ("\t}\n");
            pop_braces (old_brace_level);
        }
        break;
     case i_BKPT:               /* only needed for hardware emulators */
        sync_m68k_pc ();
        printf ("\top_illg(opcode);\n");
        break;
     case i_CALLM:              /* not present in 68030 */
        sync_m68k_pc ();
        printf ("\top_illg(opcode);\n");
        break;
     case i_RTM:                /* not present in 68030 */
        sync_m68k_pc ();
        printf ("\top_illg(opcode);\n");
        break;
     case i_TRAPcc:
        if (curi->smode != am_unknown && curi->smode != am_illg)
            genamode (curi->smode, "srcreg", curi->size, "dummy", 1, 0);
        printf ("\tif (cctrue(%d)) { Exception(7,m68k_getpc()); goto %s; }\n", curi->cc, endlabelstr);
        need_endlabel = 1;
        break;
     case i_DIVL:
        sync_m68k_pc ();
        start_brace ();
        printf ("\tuaecptr oldpc = m68k_getpc();\n");
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        sync_m68k_pc ();
        printf ("\tm68k_divl(opcode, dst, extra, oldpc);\n");
        break;
     case i_MULL:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        genamode (curi->dmode, "dstreg", curi->size, "dst", 1, 0);
        sync_m68k_pc ();
        printf ("\tm68k_mull(opcode, dst, extra);\n");
        break;
     case i_BFTST:
     case i_BFEXTU:
     case i_BFCHG:
     case i_BFEXTS:
     case i_BFCLR:
     case i_BFFFO:
     case i_BFSET:
     case i_BFINS:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        genamode (curi->dmode, "dstreg", sz_long, "dst", 2, 0);
        start_brace ();
        printf ("\tuae_s32 offset = extra & 0x800 ? m68k_dreg(regs, (extra >> 6) & 7) : (extra >> 6) & 0x1f;\n");
        printf ("\tint width = (((extra & 0x20 ? m68k_dreg(regs, extra & 7) : extra) -1) & 0x1f) +1;\n");
        if (curi->dmode == Dreg) {
            printf ("\tuae_u32 tmp = m68k_dreg(regs, dstreg) << (offset & 0x1f);\n");
        } else {
            printf ("\tuae_u32 tmp,bf0,bf1;\n");
            printf ("\tdsta += (offset >> 3) | (offset & 0x80000000 ? ~0x1fffffff : 0);\n");
            printf ("\tbf0 = get_long(dsta);bf1 = get_byte(dsta+4) & 0xff;\n");
            printf ("\ttmp = (bf0 << (offset & 7)) | (bf1 >> (8 - (offset & 7)));\n");
        }
        printf ("\ttmp >>= (32 - width);\n");
        printf ("\tSET_NFLG_ALWAYS (tmp & (1 << (width-1)) ? 1 : 0);\n");
        printf ("\tSET_ZFLG (tmp == 0); SET_VFLG (0); SET_CFLG (0);\n");
        switch (curi->mnemo) {
         case i_BFTST:
            break;
         case i_BFEXTU:
            printf ("\tm68k_dreg(regs, (extra >> 12) & 7) = tmp;\n");
            break;
         case i_BFCHG:
            printf ("\ttmp = ~tmp;\n");
            break;
         case i_BFEXTS:
            printf ("\tif (GET_NFLG) tmp |= width == 32 ? 0 : (-1 << width);\n");
            printf ("\tm68k_dreg(regs, (extra >> 12) & 7) = tmp;\n");
            break;
         case i_BFCLR:
            printf ("\ttmp = 0;\n");
            break;
         case i_BFFFO:
            printf ("\t{ uae_u32 mask = 1 << (width-1);\n");
            printf ("\twhile (mask) { if (tmp & mask) break; mask >>= 1; offset++; }}\n");
            printf ("\tm68k_dreg(regs, (extra >> 12) & 7) = offset;\n");
            break;
         case i_BFSET:
            printf ("\ttmp = 0xffffffff;\n");
            break;
         case i_BFINS:
            printf ("\ttmp = m68k_dreg(regs, (extra >> 12) & 7);\n");
            printf ("\tSET_NFLG_ALWAYS (tmp & (1 << (width - 1)) ? 1 : 0);\n");
            printf ("\tSET_ZFLG (tmp == 0);\n");
            break;
         default:
            break;
        }
        if (curi->mnemo == i_BFCHG
            || curi->mnemo == i_BFCLR
            || curi->mnemo == i_BFSET
            || curi->mnemo == i_BFINS)
        {
            printf ("\ttmp <<= (32 - width);\n");
            if (curi->dmode == Dreg) {
                printf ("\tm68k_dreg(regs, dstreg) = (m68k_dreg(regs, dstreg) & ((offset & 0x1f) == 0 ? 0 :\n");
                printf ("\t\t(0xffffffff << (32 - (offset & 0x1f))))) |\n");
                printf ("\t\t(tmp >> (offset & 0x1f)) |\n");
                printf ("\t\t(((offset & 0x1f) + width) >= 32 ? 0 :\n");
                printf (" (m68k_dreg(regs, dstreg) & ((uae_u32)0xffffffff >> ((offset & 0x1f) + width))));\n");
            } else {
                printf ("\tbf0 = (bf0 & (0xff000000 << (8 - (offset & 7)))) |\n");
                printf ("\t\t(tmp >> (offset & 7)) |\n");
                printf ("\t\t(((offset & 7) + width) >= 32 ? 0 :\n");
                printf ("\t\t (bf0 & ((uae_u32)0xffffffff >> ((offset & 7) + width))));\n");
                printf ("\tput_long(dsta,bf0 );\n");
                printf ("\tif (((offset & 7) + width) > 32) {\n");
                printf ("\t\tbf1 = (bf1 & (0xff >> (width - 32 + (offset & 7)))) |\n");
                printf ("\t\t\t(tmp << (8 - (offset & 7)));\n");
                printf ("\t\tput_byte(dsta+4,bf1);\n");
                printf ("\t}\n");
            }
        }
        break;
     case i_PACK:
        if (curi->smode == Dreg) {
            printf ("\tuae_u16 val = m68k_dreg(regs, srcreg) + %s;\n", gen_nextiword ());
            printf ("\tm68k_dreg(regs, dstreg) = (m68k_dreg(regs, dstreg) & 0xffffff00) | ((val >> 4) & 0xf0) | (val & 0xf);\n");
        } else {
            printf ("\tuae_u16 val;\n");
            printf ("\tm68k_areg(regs, srcreg) -= areg_byteinc[srcreg];\n");
            printf ("\tval = (uae_u16)get_byte(m68k_areg(regs, srcreg));\n");
            printf ("\tm68k_areg(regs, srcreg) -= areg_byteinc[srcreg];\n");
            printf ("\tval = (val | ((uae_u16)get_byte(m68k_areg(regs, srcreg)) << 8)) + %s;\n", gen_nextiword ());
            printf ("\tm68k_areg(regs, dstreg) -= areg_byteinc[dstreg];\n");
            printf ("\tput_byte(m68k_areg(regs, dstreg),((val >> 4) & 0xf0) | (val & 0xf));\n");
        }
        break;
     case i_UNPK:
        if (curi->smode == Dreg) {
            printf ("\tuae_u16 val = m68k_dreg(regs, srcreg);\n");
            printf ("\tval = (((val << 4) & 0xf00) | (val & 0xf)) + %s;\n", gen_nextiword ());
            printf ("\tm68k_dreg(regs, dstreg) = (m68k_dreg(regs, dstreg) & 0xffff0000) | (val & 0xffff);\n");
        } else {
            printf ("\tuae_u16 val;\n");
            printf ("\tm68k_areg(regs, srcreg) -= areg_byteinc[srcreg];\n");
            printf ("\tval = (uae_u16)get_byte(m68k_areg(regs, srcreg));\n");
            printf ("\tval = (((val << 4) & 0xf00) | (val & 0xf)) + %s;\n", gen_nextiword ());
            printf ("\tm68k_areg(regs, dstreg) -= areg_byteinc[dstreg];\n");
            printf ("\tput_byte(m68k_areg(regs, dstreg),val);\n");
            printf ("\tm68k_areg(regs, dstreg) -= areg_byteinc[dstreg];\n");
            printf ("\tput_byte(m68k_areg(regs, dstreg),val >> 8);\n");
        }
        break;
     case i_TAS:
        genamode (curi->smode, "srcreg", curi->size, "src", 1, 0);
        genflags (flag_logical, curi->size, "src", "", "");
        printf ("\tsrc |= 0x80;\n");
        genastore ("src", curi->smode, "srcreg", curi->size, "src");
        break;
     case i_FPP:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tfpp_opp(opcode,extra);\n");
        break;
     case i_FDBcc:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tfdbcc_opp(opcode,extra);\n");
        break;
     case i_FScc:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tfscc_opp(opcode,extra);\n");
        break;
     case i_FTRAPcc:
        sync_m68k_pc ();
        start_brace ();
        printf ("\tuaecptr oldpc = m68k_getpc();\n");
        if (curi->smode != am_unknown && curi->smode != am_illg)
            genamode (curi->smode, "srcreg", curi->size, "dummy", 1, 0);
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tftrapcc_opp(opcode,oldpc);\n");
        break;
     case i_FBcc:
        sync_m68k_pc ();
        start_brace ();
        printf ("\tuaecptr pc = m68k_getpc();\n");
        genamode (curi->dmode, "srcreg", curi->size, "extra", 1, 0);
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tfbcc_opp(opcode,pc,extra);\n");
        break;
     case i_FSAVE:
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tfsave_opp(opcode);\n");
        break;
     case i_FRESTORE:
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tfrestore_opp(opcode);\n");
        break;
     case i_CINVL:
     case i_CINVP:
     case i_CINVA:
     case i_CPUSHL:
     case i_CPUSHP:
     case i_CPUSHA:
        break;
     case i_MOVE16:
        if ((opcode & 0xfff8) == 0xf620) {
                /* MOVE16 (Ax)+,(Ay)+ */
                printf ("\tuaecptr mems = m68k_areg(regs, srcreg) & ~15, memd;\n");
                printf ("\tdstreg = (%s >> 12) & 7;\n", gen_nextiword());
                printf ("\tmemd = m68k_areg(regs, dstreg) & ~15;\n");
                printf ("\tput_long(memd, get_long(mems));\n");
                printf ("\tput_long(memd+4, get_long(mems+4));\n");
                printf ("\tput_long(memd+8, get_long(mems+8));\n");
                printf ("\tput_long(memd+12, get_long(mems+12));\n");
                printf ("\tif (srcreg != dstreg)\n");
                printf ("\tm68k_areg(regs, srcreg) += 16;\n");
                printf ("\tm68k_areg(regs, dstreg) += 16;\n");
        }
        else {
                /* Other variants */
                genamode (curi->smode, "srcreg", curi->size, "mems", 0, 2);
                genamode (curi->dmode, "dstreg", curi->size, "memd", 0, 2);
                printf ("\tmemsa &= ~15;\n");
                printf ("\tmemda &= ~15;\n");
                printf ("\tput_long(memda, get_long(memsa));\n");
                printf ("\tput_long(memda+4, get_long(memsa+4));\n");
                printf ("\tput_long(memda+8, get_long(memsa+8));\n");
                printf ("\tput_long(memda+12, get_long(memsa+12));\n");
                if ((opcode & 0xfff8) == 0xf600)
                printf ("\tm68k_areg(regs, srcreg) += 16;\n");
                else if ((opcode & 0xfff8) == 0xf608)
                printf ("\tm68k_areg(regs, dstreg) += 16;\n");
        }
        break;
     case i_MMUOP:
        genamode (curi->smode, "srcreg", curi->size, "extra", 1, 0);
        sync_m68k_pc ();
        swap_opcode ();
        printf ("\tmmu_op(opcode,extra);\n");
        break;
        
        case i_EMULOP_RETURN:
        printf ("\tm68k_emulop_return();\n");
        m68k_pc_offset = 0;
        break;
        
        case i_EMULOP:
        printf ("\n");
        swap_opcode ();
        printf ("\tm68k_emulop(opcode);\n");
        break;
        
     default:
        abort ();
        break;
    }
    finish_braces ();
    sync_m68k_pc ();
}

static void generate_includes (FILE * f)
{
    fprintf (f, "#include \"sysdeps.h\"\n");
        
    fprintf (f, "#include \"m68k.h\"\n");
    fprintf (f, "#include \"memory.h\"\n");
    fprintf (f, "#include \"readcpu.h\"\n");
    fprintf (f, "#include \"newcpu.h\"\n");
    fprintf (f, "#include \"cputbl.h\"\n");
        
        fprintf (f, "#define SET_CFLG_ALWAYS(x) SET_CFLG(x)\n");
        fprintf (f, "#define SET_NFLG_ALWAYS(x) SET_NFLG(x)\n");
        fprintf (f, "#define CPUFUNC_FF(x) x##_ff\n");
        fprintf (f, "#define CPUFUNC_NF(x) x##_nf\n");
        fprintf (f, "#define CPUFUNC(x) CPUFUNC_FF(x)\n");
        
        fprintf (f, "#ifdef NOFLAGS\n");
        fprintf (f, "# include \"noflags.h\"\n");
        fprintf (f, "#endif\n");
}

static int postfix;

static void generate_one_opcode (int rp)
{
    int i;
    uae_u16 smsk, dmsk;
    long int opcode = opcode_map[rp];

    if (table68k[opcode].mnemo == i_ILLG
        || table68k[opcode].clev > cpu_level)
        return;

    for (i = 0; lookuptab[i].name[0]; i++) {
        if (table68k[opcode].mnemo == lookuptab[i].mnemo)
            break;
    }

    if (table68k[opcode].handler != -1)
        return;

    if (opcode_next_clev[rp] != cpu_level) {
        fprintf (stblfile, "{ CPUFUNC(op_%lx_%d), 0, %ld }, /* %s */\n", opcode, opcode_last_postfix[rp],
                 opcode, lookuptab[i].name);
        return;
    }
        
        if (table68k[opcode].flagdead == 0)
        /* force to the "ff" variant since the instruction doesn't set at all the condition codes */
    fprintf (stblfile, "{ CPUFUNC_FF(op_%lx_%d), 0, %ld }, /* %s */\n", opcode, postfix, opcode, lookuptab[i].name);
        else
    fprintf (stblfile, "{ CPUFUNC(op_%lx_%d), 0, %ld }, /* %s */\n", opcode, postfix, opcode, lookuptab[i].name);

    fprintf (headerfile, "extern cpuop_func op_%lx_%d_nf;\n", opcode, postfix);
    fprintf (headerfile, "extern cpuop_func op_%lx_%d_ff;\n", opcode, postfix);
    printf ("cpuop_rettype REGPARAM2 CPUFUNC(op_%lx_%d)(uae_u32 opcode) /* %s */\n{\n", opcode, postfix, lookuptab[i].name);
        printf ("\tcpuop_begin();\n");
        
        /* gb-- The "nf" variant for an instruction that doesn't set the condition
           codes at all is the same as the "ff" variant, so we don't need the "nf"
           variant to be compiled since it is mapped to the "ff" variant in the
           smalltbl. */
        if (table68k[opcode].flagdead == 0)
        printf ("#ifndef NOFLAGS\n");

    switch (table68k[opcode].stype) {
     case 0: smsk = 7; break;
     case 1: smsk = 255; break;
     case 2: smsk = 15; break;
     case 3: smsk = 7; break;
     case 4: smsk = 7; break;
     case 5: smsk = 63; break;
         case 6: smsk = 255; break;
         case 7: smsk = 3; break;
     default: abort ();
    }
    dmsk = 7;

    next_cpu_level = -1;
    if (table68k[opcode].suse
        && table68k[opcode].smode != imm && table68k[opcode].smode != imm0
        && table68k[opcode].smode != imm1 && table68k[opcode].smode != imm2
        && table68k[opcode].smode != absw && table68k[opcode].smode != absl
        && table68k[opcode].smode != PC8r && table68k[opcode].smode != PC16
        /* gb-- We don't want to fetch the EmulOp code since the EmulOp()
           routine uses the whole opcode value. Maybe all the EmulOps
           could be expanded out but I don't think it is an improvement */
        && table68k[opcode].stype != 6
        )
    {
        if (table68k[opcode].spos == -1) {
            if (((int) table68k[opcode].sreg) >= 128)
                printf ("\tuae_u32 srcreg = (uae_s32)(uae_s8)%d;\n", (int) table68k[opcode].sreg);
            else
                printf ("\tuae_u32 srcreg = %d;\n", (int) table68k[opcode].sreg);
        } else {
            char source[100];
            int pos = table68k[opcode].spos;

#if 0
            /* Check that we can do the little endian optimization safely.  */
            if (pos < 8 && (smsk >> (8 - pos)) != 0)
                abort ();
#endif
            printf ("#ifdef HAVE_GET_WORD_UNSWAPPED\n");

            if (pos < 8 && (smsk >> (8 - pos)) != 0)
                sprintf (source, "(((opcode >> %d) | (opcode << %d)) & %d)",
                        pos ^ 8, 8 - pos, dmsk);
            else if (pos != 8)
                sprintf (source, "((opcode >> %d) & %d)", pos ^ 8, smsk);
            else
                sprintf (source, "(opcode & %d)", smsk);

            if (table68k[opcode].stype == 3)
                printf ("\tuae_u32 srcreg = imm8_table[%s];\n", source);
            else if (table68k[opcode].stype == 1)
                printf ("\tuae_u32 srcreg = (uae_s32)(uae_s8)%s;\n", source);
            else
                printf ("\tuae_u32 srcreg = %s;\n", source);

            printf ("#else\n");

            if (pos)
                sprintf (source, "((opcode >> %d) & %d)", pos, smsk);
            else
                sprintf (source, "(opcode & %d)", smsk);

            if (table68k[opcode].stype == 3)
                printf ("\tuae_u32 srcreg = imm8_table[%s];\n", source);
            else if (table68k[opcode].stype == 1)
                printf ("\tuae_u32 srcreg = (uae_s32)(uae_s8)%s;\n", source);
            else
                printf ("\tuae_u32 srcreg = %s;\n", source);

            printf ("#endif\n");
        }
    }
    if (table68k[opcode].duse
        /* Yes, the dmode can be imm, in case of LINK or DBcc */
        && table68k[opcode].dmode != imm && table68k[opcode].dmode != imm0
        && table68k[opcode].dmode != imm1 && table68k[opcode].dmode != imm2
        && table68k[opcode].dmode != absw && table68k[opcode].dmode != absl)
    {
        if (table68k[opcode].dpos == -1) {
            if (((int) table68k[opcode].dreg) >= 128)
                printf ("\tuae_u32 dstreg = (uae_s32)(uae_s8)%d;\n", (int) table68k[opcode].dreg);
            else
                printf ("\tuae_u32 dstreg = %d;\n", (int) table68k[opcode].dreg);
        } else {
            int pos = table68k[opcode].dpos;
#if 0
            /* Check that we can do the little endian optimization safely.  */
            if (pos < 8 && (dmsk >> (8 - pos)) != 0)
                abort ();
#endif      
            printf ("#ifdef HAVE_GET_WORD_UNSWAPPED\n");

            if (pos < 8 && (dmsk >> (8 - pos)) != 0)
                printf ("\tuae_u32 dstreg = ((opcode >> %d) | (opcode << %d)) & %d;\n",
                        pos ^ 8, 8 - pos, dmsk);
            else if (pos != 8)
                printf ("\tuae_u32 dstreg = (opcode >> %d) & %d;\n",
                        pos ^ 8, dmsk);
            else
                printf ("\tuae_u32 dstreg = opcode & %d;\n", dmsk);

            printf ("#else\n");

            if (pos)
                printf ("\tuae_u32 dstreg = (opcode >> %d) & %d;\n",
                        pos, dmsk);
            else
                printf ("\tuae_u32 dstreg = opcode & %d;\n", dmsk);

            printf ("#endif\n");
        }
    }
    need_endlabel = 0;
    endlabelno++;
    sprintf (endlabelstr, "endlabel%d", endlabelno);
    gen_opcode (opcode);
    if (need_endlabel)
        printf ("%s: ;\n", endlabelstr);
        if (table68k[opcode].flagdead == 0)
        printf ("\n#endif\n");
        printf ("\tcpuop_end(%s);\n", cflow_string_of(opcode));
    printf ("}\n");
    opcode_next_clev[rp] = next_cpu_level;
    opcode_last_postfix[rp] = postfix;
}

static void generate_func (void)
{
    int i, j, rp;

    using_prefetch = 0;
    using_exception_3 = 0;
#if !USE_PREFETCH_BUFFER
        /* gb-- No need for a prefetch buffer, nor exception 3 handling */
        /* Anyway, Basilisk2 does not use the op_smalltbl_5 table... */
    for (i = 0; i <= 4; i++) {
#else
    for (i = 0; i < 6; i++) {
#endif
        cpu_level = 4 - i;
        if (i == 5) {
            cpu_level = 0;
            using_prefetch = 1;
            using_exception_3 = 1;
            for (rp = 0; rp < nr_cpuop_funcs; rp++)
                opcode_next_clev[rp] = 0;
        }
        postfix = i;
        fprintf (stblfile, "struct cputbl CPUFUNC(op_smalltbl_%d)[] = {\n", postfix);

        /* sam: this is for people with low memory (eg. me :)) */
        printf ("\n"
                "#if !defined(PART_1) && !defined(PART_2) && "
                    "!defined(PART_3) && !defined(PART_4) && "
                    "!defined(PART_5) && !defined(PART_6) && "
                    "!defined(PART_7) && !defined(PART_8)"
                "\n"
                "#define PART_1 1\n"
                "#define PART_2 1\n"
                "#define PART_3 1\n"
                "#define PART_4 1\n"
                "#define PART_5 1\n"
                "#define PART_6 1\n"
                "#define PART_7 1\n"
                "#define PART_8 1\n"
                "#endif\n\n");
        
        rp = 0;
        for(j=1;j<=8;++j) {
                int k = (j*nr_cpuop_funcs)/8;
                printf ("#ifdef PART_%d\n",j);
                for (; rp < k; rp++)
                   generate_one_opcode (rp);
                printf ("#endif\n\n");
        }

        fprintf (stblfile, "{ 0, 0, 0 }};\n");
    }
}

int main (int argc, char **argv)
{
    read_table68k ();
    do_merges ();

    opcode_map = (int *) malloc (sizeof (int) * nr_cpuop_funcs);
    opcode_last_postfix = (int *) malloc (sizeof (int) * nr_cpuop_funcs);
    opcode_next_clev = (int *) malloc (sizeof (int) * nr_cpuop_funcs);
    counts = (unsigned long *) malloc (65536 * sizeof (unsigned long));
    read_counts ();

    /* It would be a lot nicer to put all in one file (we'd also get rid of
     * cputbl.h that way), but cpuopti can't cope.  That could be fixed, but
     * I don't dare to touch the 68k version.  */

    headerfile = fopen ("cputbl.h", "wb");
    stblfile = fopen ("cpustbl.cpp", "wb");
    freopen ("cpuemu.cpp", "wb", stdout);

    generate_includes (stdout);
    generate_includes (stblfile);

    generate_func ();

    free (table68k);
    return 0;
}
Revision:	1.17
Committed:	2002-09-01T15:17:13Z (21 years, 9 months ago) by gbeauche
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+94 -23 lines
Log Message:	- Merge with Basilisk II/JIT cpu core, interpretive part for now - Clean use of USE_PREFETCH_BUFFER macro and dependent bits