/**

 * $Id: sh4x86.in,v 1.15 2007-09-20 08:37:19 nkeynes Exp $

 * 

 * SH4 => x86 translation. This version does no real optimization, it just

 * outputs straight-line x86 code - it mainly exists to provide a baseline

 * to test the optimizing versions against.

 *

 * Copyright (c) 2007 Nathan Keynes.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#include <assert.h>

#include <math.h>

#ifndef NDEBUG

#define DEBUG_JUMPS 1

#endif

#include "sh4/sh4core.h"

#include "sh4/sh4trans.h"

#include "sh4/sh4mmio.h"

#include "sh4/x86op.h"

#include "clock.h"

#define DEFAULT_BACKPATCH_SIZE 4096

/** 

 * Struct to manage internal translation state. This state is not saved -

 * it is only valid between calls to sh4_translate_begin_block() and

 * sh4_translate_end_block()

 */

struct sh4_x86_state {

    gboolean in_delay_slot;

    gboolean priv_checked; /* true if we've already checked the cpu mode. */

    gboolean fpuen_checked; /* true if we've already checked fpu enabled. */

    int exit_code;

    /* Allocated memory for the (block-wide) back-patch list */

    uint32_t **backpatch_list;

    uint32_t backpatch_posn;

    uint32_t backpatch_size;

};

#define EXIT_DATA_ADDR_READ 0

#define EXIT_DATA_ADDR_WRITE 7

#define EXIT_ILLEGAL 14

#define EXIT_SLOT_ILLEGAL 21

#define EXIT_FPU_DISABLED 28

#define EXIT_SLOT_FPU_DISABLED 35

static struct sh4_x86_state sh4_x86;

static uint32_t max_int = 0x7FFFFFFF;

static uint32_t min_int = 0x80000000;

static uint32_t save_fcw; /* save value for fpu control word */

static uint32_t trunc_fcw = 0x0F7F; /* fcw value for truncation mode */

void sh4_x86_init()

{

    sh4_x86.backpatch_list = malloc(DEFAULT_BACKPATCH_SIZE);

    sh4_x86.backpatch_size = DEFAULT_BACKPATCH_SIZE / sizeof(uint32_t *);

}

static void sh4_x86_add_backpatch( uint8_t *ptr )

{

    if( sh4_x86.backpatch_posn == sh4_x86.backpatch_size ) {

	sh4_x86.backpatch_size <<= 1;

	sh4_x86.backpatch_list = realloc( sh4_x86.backpatch_list, sh4_x86.backpatch_size * sizeof(uint32_t *) );

	assert( sh4_x86.backpatch_list != NULL );

    }

    sh4_x86.backpatch_list[sh4_x86.backpatch_posn++] = (uint32_t *)ptr;

}

static void sh4_x86_do_backpatch( uint8_t *reloc_base )

{

    unsigned int i;

    for( i=0; i<sh4_x86.backpatch_posn; i++ ) {

	*sh4_x86.backpatch_list[i] += (reloc_base - ((uint8_t *)sh4_x86.backpatch_list[i]) - 4);

    }

}

/**

 * Emit an instruction to load an SH4 reg into a real register

 */

static inline void load_reg( int x86reg, int sh4reg ) 

{

    /* mov [bp+n], reg */

    OP(0x8B);

    OP(0x45 + (x86reg<<3));

    OP(REG_OFFSET(r[sh4reg]));

}

static inline void load_reg16s( int x86reg, int sh4reg )

{

    OP(0x0F);

    OP(0xBF);

    MODRM_r32_sh4r(x86reg, REG_OFFSET(r[sh4reg]));

}

static inline void load_reg16u( int x86reg, int sh4reg )

{

    OP(0x0F);

    OP(0xB7);

    MODRM_r32_sh4r(x86reg, REG_OFFSET(r[sh4reg]));

}

#define load_spreg( x86reg, regoff ) MOV_sh4r_r32( regoff, x86reg )

#define store_spreg( x86reg, regoff ) MOV_r32_sh4r( x86reg, regoff )

/**

 * Emit an instruction to load an immediate value into a register

 */

static inline void load_imm32( int x86reg, uint32_t value ) {

    /* mov #value, reg */

    OP(0xB8 + x86reg);

    OP32(value);

}

/**

 * Emit an instruction to store an SH4 reg (RN)

 */

void static inline store_reg( int x86reg, int sh4reg ) {

    /* mov reg, [bp+n] */

    OP(0x89);

    OP(0x45 + (x86reg<<3));

    OP(REG_OFFSET(r[sh4reg]));

}

#define load_fr_bank(bankreg) load_spreg( bankreg, REG_OFFSET(fr_bank))

/**

 * Load an FR register (single-precision floating point) into an integer x86

 * register (eg for register-to-register moves)

 */

void static inline load_fr( int bankreg, int x86reg, int frm )

{

    OP(0x8B); OP(0x40+bankreg+(x86reg<<3)); OP((frm^1)<<2);

}

/**

 * Store an FR register (single-precision floating point) into an integer x86

 * register (eg for register-to-register moves)

 */

void static inline store_fr( int bankreg, int x86reg, int frn )

{

    OP(0x89);  OP(0x40+bankreg+(x86reg<<3)); OP((frn^1)<<2);

}

/**

 * Load a pointer to the back fp back into the specified x86 register. The

 * bankreg must have been previously loaded with FPSCR.

 * NB: 12 bytes

 */

static inline void load_xf_bank( int bankreg )

{

    NOT_r32( bankreg );

    SHR_imm8_r32( (21 - 6), bankreg ); // Extract bit 21 then *64 for bank size

    AND_imm8s_r32( 0x40, bankreg );    // Complete extraction

    OP(0x8D); OP(0x44+(bankreg<<3)); OP(0x28+bankreg); OP(REG_OFFSET(fr)); // LEA [ebp+bankreg+disp], bankreg

}

/**

 * Update the fr_bank pointer based on the current fpscr value.

 */

static inline void update_fr_bank( int fpscrreg )

{

    SHR_imm8_r32( (21 - 6), fpscrreg ); // Extract bit 21 then *64 for bank size

    AND_imm8s_r32( 0x40, fpscrreg );    // Complete extraction

    OP(0x8D); OP(0x44+(fpscrreg<<3)); OP(0x28+fpscrreg); OP(REG_OFFSET(fr)); // LEA [ebp+fpscrreg+disp], fpscrreg

    store_spreg( fpscrreg, REG_OFFSET(fr_bank) );

}

/**

 * Push FPUL (as a 32-bit float) onto the FPU stack

 */

static inline void push_fpul( )

{

    OP(0xD9); OP(0x45); OP(R_FPUL);

}

/**

 * Pop FPUL (as a 32-bit float) from the FPU stack

 */

static inline void pop_fpul( )

{

    OP(0xD9); OP(0x5D); OP(R_FPUL);

}

/**

 * Push a 32-bit float onto the FPU stack, with bankreg previously loaded

 * with the location of the current fp bank.

 */

static inline void push_fr( int bankreg, int frm ) 

{

    OP(0xD9); OP(0x40 + bankreg); OP((frm^1)<<2);  // FLD.S [bankreg + frm^1*4]

}

/**

 * Pop a 32-bit float from the FPU stack and store it back into the fp bank, 

 * with bankreg previously loaded with the location of the current fp bank.

 */

static inline void pop_fr( int bankreg, int frm )

{

    OP(0xD9); OP(0x58 + bankreg); OP((frm^1)<<2); // FST.S [bankreg + frm^1*4]

}

/**

 * Push a 64-bit double onto the FPU stack, with bankreg previously loaded

 * with the location of the current fp bank.

 */

static inline void push_dr( int bankreg, int frm )

{

    OP(0xDD); OP(0x40 + bankreg); OP(frm<<2); // FLD.D [bankreg + frm*4]

}

static inline void pop_dr( int bankreg, int frm )

{

    OP(0xDD); OP(0x58 + bankreg); OP(frm<<2); // FST.D [bankreg + frm*4]

}

/**

 * Note: clobbers EAX to make the indirect call - this isn't usually

 * a problem since the callee will usually clobber it anyway.

 */

static inline void call_func0( void *ptr )

{

    load_imm32(R_EAX, (uint32_t)ptr);

    CALL_r32(R_EAX);

}

static inline void call_func1( void *ptr, int arg1 )

{

    PUSH_r32(arg1);

    call_func0(ptr);

    ADD_imm8s_r32( 4, R_ESP );

}

static inline void call_func2( void *ptr, int arg1, int arg2 )

{

    PUSH_r32(arg2);

    PUSH_r32(arg1);

    call_func0(ptr);

    ADD_imm8s_r32( 8, R_ESP );

}

/**

 * Write a double (64-bit) value into memory, with the first word in arg2a, and

 * the second in arg2b

 * NB: 30 bytes

 */

static inline void MEM_WRITE_DOUBLE( int addr, int arg2a, int arg2b )

{

    ADD_imm8s_r32( 4, addr );

    PUSH_r32(arg2b);

    PUSH_r32(addr);

    ADD_imm8s_r32( -4, addr );

    PUSH_r32(arg2a);

    PUSH_r32(addr);

    call_func0(sh4_write_long);

    ADD_imm8s_r32( 8, R_ESP );

    call_func0(sh4_write_long);

    ADD_imm8s_r32( 8, R_ESP );

}

/**

 * Read a double (64-bit) value from memory, writing the first word into arg2a

 * and the second into arg2b. The addr must not be in EAX

 * NB: 27 bytes

 */

static inline void MEM_READ_DOUBLE( int addr, int arg2a, int arg2b )

{

    PUSH_r32(addr);

    call_func0(sh4_read_long);

    POP_r32(addr);

    PUSH_r32(R_EAX);

    ADD_imm8s_r32( 4, addr );

    PUSH_r32(addr);

    call_func0(sh4_read_long);

    ADD_imm8s_r32( 4, R_ESP );

    MOV_r32_r32( R_EAX, arg2b );

    POP_r32(arg2a);

}

/* Exception checks - Note that all exception checks will clobber EAX */

static void check_priv( )

{

    if( !sh4_x86.priv_checked ) {

	sh4_x86.priv_checked = TRUE;

	load_spreg( R_EAX, R_SR );

	AND_imm32_r32( SR_MD, R_EAX );

	if( sh4_x86.in_delay_slot ) {

	    JE_exit( EXIT_SLOT_ILLEGAL );

	} else {

	    JE_exit( EXIT_ILLEGAL );

	}

    }

}

static void check_fpuen( )

{

    if( !sh4_x86.fpuen_checked ) {

	sh4_x86.fpuen_checked = TRUE;

	load_spreg( R_EAX, R_SR );

	AND_imm32_r32( SR_FD, R_EAX );

	if( sh4_x86.in_delay_slot ) {

	    JNE_exit(EXIT_SLOT_FPU_DISABLED);

	} else {

	    JNE_exit(EXIT_FPU_DISABLED);

	}

    }

}

static void check_ralign16( int x86reg )

{

    TEST_imm32_r32( 0x00000001, x86reg );

    JNE_exit(EXIT_DATA_ADDR_READ);

}

static void check_walign16( int x86reg )

{

    TEST_imm32_r32( 0x00000001, x86reg );

    JNE_exit(EXIT_DATA_ADDR_WRITE);

}

static void check_ralign32( int x86reg )

{

    TEST_imm32_r32( 0x00000003, x86reg );

    JNE_exit(EXIT_DATA_ADDR_READ);

}

static void check_walign32( int x86reg )

{

    TEST_imm32_r32( 0x00000003, x86reg );

    JNE_exit(EXIT_DATA_ADDR_WRITE);

}

#define UNDEF()

#define MEM_RESULT(value_reg) if(value_reg != R_EAX) { MOV_r32_r32(R_EAX,value_reg); }

#define MEM_READ_BYTE( addr_reg, value_reg ) call_func1(sh4_read_byte, addr_reg ); MEM_RESULT(value_reg)

#define MEM_READ_WORD( addr_reg, value_reg ) call_func1(sh4_read_word, addr_reg ); MEM_RESULT(value_reg)

#define MEM_READ_LONG( addr_reg, value_reg ) call_func1(sh4_read_long, addr_reg ); MEM_RESULT(value_reg)

#define MEM_WRITE_BYTE( addr_reg, value_reg ) call_func2(sh4_write_byte, addr_reg, value_reg)

#define MEM_WRITE_WORD( addr_reg, value_reg ) call_func2(sh4_write_word, addr_reg, value_reg)

#define MEM_WRITE_LONG( addr_reg, value_reg ) call_func2(sh4_write_long, addr_reg, value_reg)

#define SLOTILLEGAL() JMP_exit(EXIT_SLOT_ILLEGAL); sh4_x86.in_delay_slot = FALSE; return 1;

/**

 * Emit the 'start of block' assembly. Sets up the stack frame and save

 * SI/DI as required

 */

void sh4_translate_begin_block() 

{

    PUSH_r32(R_EBP);

    /* mov &sh4r, ebp */

    load_imm32( R_EBP, (uint32_t)&sh4r );

    PUSH_r32(R_EDI);

    PUSH_r32(R_ESI);

    XOR_r32_r32(R_ESI, R_ESI);

    sh4_x86.in_delay_slot = FALSE;

    sh4_x86.priv_checked = FALSE;

    sh4_x86.fpuen_checked = FALSE;

    sh4_x86.backpatch_posn = 0;

    sh4_x86.exit_code = 1;

}

/**

 * Exit the block early (ie branch out), conditionally or otherwise

 */

void exit_block( )

{

    store_spreg( R_EDI, REG_OFFSET(pc) );

    MOV_moff32_EAX( (uint32_t)&sh4_cpu_period );

    load_spreg( R_ECX, REG_OFFSET(slice_cycle) );

    MUL_r32( R_ESI );

    ADD_r32_r32( R_EAX, R_ECX );

    store_spreg( R_ECX, REG_OFFSET(slice_cycle) );

    load_imm32( R_EAX, sh4_x86.exit_code );

    POP_r32(R_ESI);

    POP_r32(R_EDI);

    POP_r32(R_EBP);

    RET();

}

/**

 * Flush any open regs back to memory, restore SI/DI/, update PC, etc

 */

void sh4_translate_end_block( sh4addr_t pc ) {

    assert( !sh4_x86.in_delay_slot ); // should never stop here

    // Normal termination - save PC, cycle count

    exit_block( );

    if( sh4_x86.backpatch_posn != 0 ) {

	uint8_t *end_ptr = xlat_output;

	// Exception termination. Jump block for various exception codes:

	PUSH_imm32( EXC_DATA_ADDR_READ );

	JMP_rel8( 33, target1 );

	PUSH_imm32( EXC_DATA_ADDR_WRITE );

	JMP_rel8( 26, target2 );

	PUSH_imm32( EXC_ILLEGAL );

	JMP_rel8( 19, target3 );

	PUSH_imm32( EXC_SLOT_ILLEGAL ); 

	JMP_rel8( 12, target4 );

	PUSH_imm32( EXC_FPU_DISABLED ); 

	JMP_rel8( 5, target5 );

	PUSH_imm32( EXC_SLOT_FPU_DISABLED );

	// target

	JMP_TARGET(target1);

	JMP_TARGET(target2);

	JMP_TARGET(target3);

	JMP_TARGET(target4);

	JMP_TARGET(target5);

	load_spreg( R_ECX, REG_OFFSET(pc) );

	ADD_r32_r32( R_ESI, R_ECX );

	ADD_r32_r32( R_ESI, R_ECX );

	store_spreg( R_ECX, REG_OFFSET(pc) );

	MOV_moff32_EAX( (uint32_t)&sh4_cpu_period );

	load_spreg( R_ECX, REG_OFFSET(slice_cycle) );

	MUL_r32( R_ESI );

	ADD_r32_r32( R_EAX, R_ECX );

	store_spreg( R_ECX, REG_OFFSET(slice_cycle) );

	load_imm32( R_EAX, (uint32_t)sh4_raise_exception ); // 6

	CALL_r32( R_EAX ); // 2

	ADD_imm8s_r32( 4, R_ESP );

	POP_r32(R_ESI);

	POP_r32(R_EDI);

	POP_r32(R_EBP);

	RET();

	sh4_x86_do_backpatch( end_ptr );

    }

}

extern uint16_t *sh4_icache;

extern uint32_t sh4_icache_addr;

/**

 * Translate a single instruction. Delayed branches are handled specially

 * by translating both branch and delayed instruction as a single unit (as

 * 

 *

 * @return true if the instruction marks the end of a basic block

 * (eg a branch or 

 */

uint32_t sh4_x86_translate_instruction( uint32_t pc )

{

    uint32_t ir;

    /* Read instruction */

    uint32_t pageaddr = pc >> 12;

    if( sh4_icache != NULL && pageaddr == sh4_icache_addr ) {

	ir = sh4_icache[(pc&0xFFF)>>1];

    } else {

	sh4_icache = (uint16_t *)mem_get_page(pc);

	if( ((uint32_t)sh4_icache) < MAX_IO_REGIONS ) {

	    /* If someone's actually been so daft as to try to execute out of an IO

	     * region, fallback on the full-blown memory read

	     */

	    sh4_icache = NULL;

	    ir = sh4_read_word(pc);

	} else {

	    sh4_icache_addr = pageaddr;

	    ir = sh4_icache[(pc&0xFFF)>>1];

	}

    }

%%

/* ALU operations */

ADD Rm, Rn {:

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    ADD_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

:}

ADD #imm, Rn {:  

    load_reg( R_EAX, Rn );

    ADD_imm8s_r32( imm, R_EAX );

    store_reg( R_EAX, Rn );

:}

ADDC Rm, Rn {:

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    LDC_t();

    ADC_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

    SETC_t();

:}

ADDV Rm, Rn {:

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    ADD_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

    SETO_t();

:}

AND Rm, Rn {:

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    AND_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

:}

AND #imm, R0 {:  

    load_reg( R_EAX, 0 );

    AND_imm32_r32(imm, R_EAX); 

    store_reg( R_EAX, 0 );

:}

AND.B #imm, @(R0, GBR) {: 

    load_reg( R_EAX, 0 );

    load_spreg( R_ECX, R_GBR );

    ADD_r32_r32( R_EAX, R_ECX );

    PUSH_r32(R_ECX);

    call_func0(sh4_read_byte);

    POP_r32(R_ECX);

    AND_imm32_r32(imm, R_EAX );

    MEM_WRITE_BYTE( R_ECX, R_EAX );

:}

CMP/EQ Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    CMP_r32_r32( R_EAX, R_ECX );

    SETE_t();

:}

CMP/EQ #imm, R0 {:  

    load_reg( R_EAX, 0 );

    CMP_imm8s_r32(imm, R_EAX);

    SETE_t();

:}

CMP/GE Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    CMP_r32_r32( R_EAX, R_ECX );

    SETGE_t();

:}

CMP/GT Rm, Rn {: 

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    CMP_r32_r32( R_EAX, R_ECX );

    SETG_t();

:}

CMP/HI Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    CMP_r32_r32( R_EAX, R_ECX );

    SETA_t();

:}

CMP/HS Rm, Rn {: 

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    CMP_r32_r32( R_EAX, R_ECX );

    SETAE_t();

 :}

CMP/PL Rn {: 

    load_reg( R_EAX, Rn );

    CMP_imm8s_r32( 0, R_EAX );

    SETG_t();

:}

CMP/PZ Rn {:  

    load_reg( R_EAX, Rn );

    CMP_imm8s_r32( 0, R_EAX );

    SETGE_t();

:}

CMP/STR Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    XOR_r32_r32( R_ECX, R_EAX );

    TEST_r8_r8( R_AL, R_AL );

    JE_rel8(13, target1);

    TEST_r8_r8( R_AH, R_AH ); // 2

    JE_rel8(9, target2);

    SHR_imm8_r32( 16, R_EAX ); // 3

    TEST_r8_r8( R_AL, R_AL ); // 2

    JE_rel8(2, target3);

    TEST_r8_r8( R_AH, R_AH ); // 2

    JMP_TARGET(target1);

    JMP_TARGET(target2);

    JMP_TARGET(target3);

    SETE_t();

:}

DIV0S Rm, Rn {:

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    SHR_imm8_r32( 31, R_EAX );

    SHR_imm8_r32( 31, R_ECX );

    store_spreg( R_EAX, R_M );

    store_spreg( R_ECX, R_Q );

    CMP_r32_r32( R_EAX, R_ECX );

    SETNE_t();

:}

DIV0U {:  

    XOR_r32_r32( R_EAX, R_EAX );

    store_spreg( R_EAX, R_Q );

    store_spreg( R_EAX, R_M );

    store_spreg( R_EAX, R_T );

:}

DIV1 Rm, Rn {:

    load_spreg( R_ECX, R_M );

    load_reg( R_EAX, Rn );

    LDC_t();

    RCL1_r32( R_EAX );

    SETC_r8( R_DL ); // Q'

    CMP_sh4r_r32( R_Q, R_ECX );

    JE_rel8(5, mqequal);

    ADD_sh4r_r32( REG_OFFSET(r[Rm]), R_EAX );

    JMP_rel8(3, end);

    JMP_TARGET(mqequal);

    SUB_sh4r_r32( REG_OFFSET(r[Rm]), R_EAX );

    JMP_TARGET(end);

    store_reg( R_EAX, Rn ); // Done with Rn now

    SETC_r8(R_AL); // tmp1

    XOR_r8_r8( R_DL, R_AL ); // Q' = Q ^ tmp1

    XOR_r8_r8( R_AL, R_CL ); // Q'' = Q' ^ M

    store_spreg( R_ECX, R_Q );

    XOR_imm8s_r32( 1, R_AL );   // T = !Q'

    MOVZX_r8_r32( R_AL, R_EAX );

    store_spreg( R_EAX, R_T );

:}

DMULS.L Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    IMUL_r32(R_ECX);

    store_spreg( R_EDX, R_MACH );

    store_spreg( R_EAX, R_MACL );

:}

DMULU.L Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    MUL_r32(R_ECX);

    store_spreg( R_EDX, R_MACH );

    store_spreg( R_EAX, R_MACL );    

:}

DT Rn {:  

    load_reg( R_EAX, Rn );

    ADD_imm8s_r32( -1, R_EAX );

    store_reg( R_EAX, Rn );

    SETE_t();

:}

EXTS.B Rm, Rn {:  

    load_reg( R_EAX, Rm );

    MOVSX_r8_r32( R_EAX, R_EAX );

    store_reg( R_EAX, Rn );

:}

EXTS.W Rm, Rn {:  

    load_reg( R_EAX, Rm );

    MOVSX_r16_r32( R_EAX, R_EAX );

    store_reg( R_EAX, Rn );

:}

EXTU.B Rm, Rn {:  

    load_reg( R_EAX, Rm );

    MOVZX_r8_r32( R_EAX, R_EAX );

    store_reg( R_EAX, Rn );

:}

EXTU.W Rm, Rn {:  

    load_reg( R_EAX, Rm );

    MOVZX_r16_r32( R_EAX, R_EAX );

    store_reg( R_EAX, Rn );

:}

MAC.L @Rm+, @Rn+ {:  

    load_reg( R_ECX, Rm );

    check_ralign32( R_ECX );

    load_reg( R_ECX, Rn );

    check_ralign32( R_ECX );

    ADD_imm8s_sh4r( 4, REG_OFFSET(r[Rn]) );

    MEM_READ_LONG( R_ECX, R_EAX );

    PUSH_r32( R_EAX );

    load_reg( R_ECX, Rm );

    ADD_imm8s_sh4r( 4, REG_OFFSET(r[Rm]) );

    MEM_READ_LONG( R_ECX, R_EAX );

    POP_r32( R_ECX );

    IMUL_r32( R_ECX );

    ADD_r32_sh4r( R_EAX, R_MACL );

    ADC_r32_sh4r( R_EDX, R_MACH );

    load_spreg( R_ECX, R_S );

    TEST_r32_r32(R_ECX, R_ECX);

    JE_rel8( 7, nosat );

    call_func0( signsat48 );

    JMP_TARGET( nosat );

:}

MAC.W @Rm+, @Rn+ {:  

    load_reg( R_ECX, Rm );

    check_ralign16( R_ECX );

    load_reg( R_ECX, Rn );

    check_ralign16( R_ECX );

    ADD_imm8s_sh4r( 2, REG_OFFSET(r[Rn]) );

    MEM_READ_WORD( R_ECX, R_EAX );

    PUSH_r32( R_EAX );

    load_reg( R_ECX, Rm );

    ADD_imm8s_sh4r( 2, REG_OFFSET(r[Rm]) );

    MEM_READ_WORD( R_ECX, R_EAX );

    POP_r32( R_ECX );

    IMUL_r32( R_ECX );

    load_spreg( R_ECX, R_S );

    TEST_r32_r32( R_ECX, R_ECX );

    JE_rel8( 47, nosat );

    ADD_r32_sh4r( R_EAX, R_MACL );  // 6

    JNO_rel8( 51, end );            // 2

    load_imm32( R_EDX, 1 );         // 5

    store_spreg( R_EDX, R_MACH );   // 6

    JS_rel8( 13, positive );        // 2

    load_imm32( R_EAX, 0x80000000 );// 5

    store_spreg( R_EAX, R_MACL );   // 6

    JMP_rel8( 25, end2 );           // 2

    JMP_TARGET(positive);

    load_imm32( R_EAX, 0x7FFFFFFF );// 5

    store_spreg( R_EAX, R_MACL );   // 6

    JMP_rel8( 12, end3);            // 2

    JMP_TARGET(nosat);

    ADD_r32_sh4r( R_EAX, R_MACL );  // 6

    ADC_r32_sh4r( R_EDX, R_MACH );  // 6

    JMP_TARGET(end);

    JMP_TARGET(end2);

    JMP_TARGET(end3);

:}

MOVT Rn {:  

    load_spreg( R_EAX, R_T );

    store_reg( R_EAX, Rn );

:}

MUL.L Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    MUL_r32( R_ECX );

    store_spreg( R_EAX, R_MACL );

:}

MULS.W Rm, Rn {:

    load_reg16s( R_EAX, Rm );

    load_reg16s( R_ECX, Rn );

    MUL_r32( R_ECX );

    store_spreg( R_EAX, R_MACL );

:}

MULU.W Rm, Rn {:  

    load_reg16u( R_EAX, Rm );

    load_reg16u( R_ECX, Rn );

    MUL_r32( R_ECX );

    store_spreg( R_EAX, R_MACL );

:}

NEG Rm, Rn {:

    load_reg( R_EAX, Rm );

    NEG_r32( R_EAX );

    store_reg( R_EAX, Rn );

:}

NEGC Rm, Rn {:  

    load_reg( R_EAX, Rm );

    XOR_r32_r32( R_ECX, R_ECX );

    LDC_t();

    SBB_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

    SETC_t();

:}

NOT Rm, Rn {:  

    load_reg( R_EAX, Rm );

    NOT_r32( R_EAX );

    store_reg( R_EAX, Rn );

:}

OR Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    OR_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

:}

OR #imm, R0 {:

    load_reg( R_EAX, 0 );

    OR_imm32_r32(imm, R_EAX);

    store_reg( R_EAX, 0 );

:}

OR.B #imm, @(R0, GBR) {:  

    load_reg( R_EAX, 0 );

    load_spreg( R_ECX, R_GBR );

    ADD_r32_r32( R_EAX, R_ECX );

    PUSH_r32(R_ECX);

    call_func0(sh4_read_byte);

    POP_r32(R_ECX);

    OR_imm32_r32(imm, R_EAX );

    MEM_WRITE_BYTE( R_ECX, R_EAX );

:}

ROTCL Rn {:

    load_reg( R_EAX, Rn );

    LDC_t();

    RCL1_r32( R_EAX );

    store_reg( R_EAX, Rn );

    SETC_t();

:}

ROTCR Rn {:  

    load_reg( R_EAX, Rn );

    LDC_t();

    RCR1_r32( R_EAX );

    store_reg( R_EAX, Rn );

    SETC_t();

:}

ROTL Rn {:  

    load_reg( R_EAX, Rn );

    ROL1_r32( R_EAX );

    store_reg( R_EAX, Rn );

    SETC_t();

:}

ROTR Rn {:  

    load_reg( R_EAX, Rn );

    ROR1_r32( R_EAX );

    store_reg( R_EAX, Rn );

    SETC_t();

:}

SHAD Rm, Rn {:

    /* Annoyingly enough, not directly convertible */

    load_reg( R_EAX, Rn );

    load_reg( R_ECX, Rm );

    CMP_imm32_r32( 0, R_ECX );

    JGE_rel8(16, doshl);

    NEG_r32( R_ECX );      // 2

    AND_imm8_r8( 0x1F, R_CL ); // 3

    JE_rel8( 4, emptysar);     // 2

    SAR_r32_CL( R_EAX );       // 2

    JMP_rel8(10, end);          // 2

    JMP_TARGET(emptysar);

    SAR_imm8_r32(31, R_EAX );  // 3

    JMP_rel8(5, end2);

    JMP_TARGET(doshl);

    AND_imm8_r8( 0x1F, R_CL ); // 3

    SHL_r32_CL( R_EAX );       // 2

    JMP_TARGET(end);

    JMP_TARGET(end2);

    store_reg( R_EAX, Rn );

:}

SHLD Rm, Rn {:  

    load_reg( R_EAX, Rn );

    load_reg( R_ECX, Rm );

    CMP_imm32_r32( 0, R_ECX );

    JGE_rel8(15, doshl);

    NEG_r32( R_ECX );      // 2

    AND_imm8_r8( 0x1F, R_CL ); // 3

    JE_rel8( 4, emptyshr );

    SHR_r32_CL( R_EAX );       // 2

    JMP_rel8(9, end);          // 2

    JMP_TARGET(emptyshr);

    XOR_r32_r32( R_EAX, R_EAX );

    JMP_rel8(5, end2);

    JMP_TARGET(doshl);

    AND_imm8_r8( 0x1F, R_CL ); // 3

    SHL_r32_CL( R_EAX );       // 2

    JMP_TARGET(end);

    JMP_TARGET(end2);

    store_reg( R_EAX, Rn );

:}

SHAL Rn {: 

    load_reg( R_EAX, Rn );

    SHL1_r32( R_EAX );

    SETC_t();

    store_reg( R_EAX, Rn );

:}

SHAR Rn {:  

    load_reg( R_EAX, Rn );

    SAR1_r32( R_EAX );

    SETC_t();

    store_reg( R_EAX, Rn );

:}

SHLL Rn {:  

    load_reg( R_EAX, Rn );

    SHL1_r32( R_EAX );

    SETC_t();

    store_reg( R_EAX, Rn );

:}

SHLL2 Rn {:

    load_reg( R_EAX, Rn );

    SHL_imm8_r32( 2, R_EAX );

    store_reg( R_EAX, Rn );

:}

SHLL8 Rn {:  

    load_reg( R_EAX, Rn );

    SHL_imm8_r32( 8, R_EAX );

    store_reg( R_EAX, Rn );

:}

SHLL16 Rn {:  

    load_reg( R_EAX, Rn );

    SHL_imm8_r32( 16, R_EAX );

    store_reg( R_EAX, Rn );

:}

SHLR Rn {:  

    load_reg( R_EAX, Rn );

    SHR1_r32( R_EAX );

    SETC_t();

    store_reg( R_EAX, Rn );

:}

SHLR2 Rn {:  

    load_reg( R_EAX, Rn );

    SHR_imm8_r32( 2, R_EAX );

    store_reg( R_EAX, Rn );

:}

SHLR8 Rn {:  

    load_reg( R_EAX, Rn );

    SHR_imm8_r32( 8, R_EAX );

    store_reg( R_EAX, Rn );

:}

SHLR16 Rn {:  

    load_reg( R_EAX, Rn );

    SHR_imm8_r32( 16, R_EAX );

    store_reg( R_EAX, Rn );

:}

SUB Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    SUB_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

:}

SUBC Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    LDC_t();

    SBB_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

    SETC_t();

:}

SUBV Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    SUB_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

    SETO_t();

:}

SWAP.B Rm, Rn {:  

    load_reg( R_EAX, Rm );

    XCHG_r8_r8( R_AL, R_AH );

    store_reg( R_EAX, Rn );

:}

SWAP.W Rm, Rn {:  

    load_reg( R_EAX, Rm );

    MOV_r32_r32( R_EAX, R_ECX );

    SHL_imm8_r32( 16, R_ECX );

    SHR_imm8_r32( 16, R_EAX );

    OR_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

:}

TAS.B @Rn {:  

    load_reg( R_ECX, Rn );

    MEM_READ_BYTE( R_ECX, R_EAX );

    TEST_r8_r8( R_AL, R_AL );

    SETE_t();

    OR_imm8_r8( 0x80, R_AL );

    load_reg( R_ECX, Rn );

    MEM_WRITE_BYTE( R_ECX, R_EAX );

:}

TST Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    TEST_r32_r32( R_EAX, R_ECX );

    SETE_t();

:}

TST #imm, R0 {:  

    load_reg( R_EAX, 0 );

    TEST_imm32_r32( imm, R_EAX );

    SETE_t();

:}

TST.B #imm, @(R0, GBR) {:  

    load_reg( R_EAX, 0);

    load_reg( R_ECX, R_GBR);

    ADD_r32_r32( R_EAX, R_ECX );

    MEM_READ_BYTE( R_ECX, R_EAX );

    TEST_imm8_r8( imm, R_AL );

    SETE_t();

:}

XOR Rm, Rn {:  

    load_reg( R_EAX, Rm );

    load_reg( R_ECX, Rn );

    XOR_r32_r32( R_EAX, R_ECX );

    store_reg( R_ECX, Rn );

:}