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target-mips: optimize gen_arith() 

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7043 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-04-08 21:48:02 +00:00
parent 35fbce2c41
commit 460f00c4e1
1 changed files with 289 additions and 157 deletions
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446
target-mips/translate.c
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@ -1452,200 +1452,338 @@ static void gen_arith (CPUState *env, DisasContext *ctx, uint32_t opc,
int rd, int rs, int rt)
{
const char *opn = "arith";
TCGv t0 = tcg_temp_local_new();
TCGv t1 = tcg_temp_local_new();
if (rd == 0 && opc != OPC_ADD && opc != OPC_SUB
&& opc != OPC_DADD && opc != OPC_DSUB) {
/* If no destination, treat it as a NOP.
For add & sub, we must generate the overflow exception when needed. */
MIPS_DEBUG("NOP");
goto out;
return;
}
gen_load_gpr(t0, rs);
/* Specialcase the conventional move operation. */
if (rt == 0 && (opc == OPC_ADDU || opc == OPC_DADDU
|| opc == OPC_SUBU || opc == OPC_DSUBU)) {
gen_store_gpr(t0, rd);
goto out;
}
gen_load_gpr(t1, rt);
switch (opc) {
case OPC_ADD:
{
TCGv r_tmp1 = tcg_temp_new();
TCGv r_tmp2 = tcg_temp_new();
TCGv t0 = tcg_temp_local_new();
TCGv t1 = tcg_temp_new();
TCGv t2 = tcg_temp_new();
int l1 = gen_new_label();
save_cpu_state(ctx, 1);
tcg_gen_ext32s_tl(r_tmp1, t0);
tcg_gen_ext32s_tl(r_tmp2, t1);
tcg_gen_add_tl(t0, r_tmp1, r_tmp2);
tcg_gen_xor_tl(r_tmp1, r_tmp1, t1);
tcg_gen_xori_tl(r_tmp1, r_tmp1, -1);
tcg_gen_xor_tl(r_tmp2, t0, t1);
tcg_gen_and_tl(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_brcondi_tl(TCG_COND_GE, r_tmp1, 0, l1);
gen_load_gpr(t1, rs);
gen_load_gpr(t2, rt);
tcg_gen_add_tl(t0, t1, t2);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_xor_tl(t1, t1, t2);
tcg_gen_not_tl(t1, t1);
tcg_gen_xor_tl(t2, t0, t2);
tcg_gen_and_tl(t1, t1, t2);
tcg_temp_free(t2);
tcg_gen_brcondi_tl(TCG_COND_GE, t1, 0, l1);
tcg_temp_free(t1);
/* operands of same sign, result different sign */
generate_exception(ctx, EXCP_OVERFLOW);
gen_set_label(l1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
gen_store_gpr(t0, rd);
tcg_temp_free(t0);
}
opn = "add";
break;
case OPC_ADDU:
tcg_gen_add_tl(t0, t0, t1);
tcg_gen_ext32s_tl(t0, t0);
if (rs != 0 && rt != 0) {
tcg_gen_add_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
} else if (rs == 0 && rt != 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "addu";
break;
case OPC_SUB:
{
TCGv r_tmp1 = tcg_temp_new();
TCGv r_tmp2 = tcg_temp_new();
TCGv t0 = tcg_temp_local_new();
TCGv t1 = tcg_temp_new();
TCGv t2 = tcg_temp_new();
int l1 = gen_new_label();
save_cpu_state(ctx, 1);
tcg_gen_ext32s_tl(r_tmp1, t0);
tcg_gen_ext32s_tl(r_tmp2, t1);
tcg_gen_sub_tl(t0, r_tmp1, r_tmp2);
tcg_gen_xor_tl(r_tmp2, r_tmp1, t1);
tcg_gen_xor_tl(r_tmp1, r_tmp1, t0);
tcg_gen_and_tl(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_brcondi_tl(TCG_COND_GE, r_tmp1, 0, l1);
/* operands of different sign, first operand and result different sign */
gen_load_gpr(t1, rs);
gen_load_gpr(t2, rt);
tcg_gen_sub_tl(t0, t1, t2);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_xor_tl(t2, t1, t2);
tcg_gen_xor_tl(t1, t0, t1);
tcg_gen_and_tl(t1, t1, t2);
tcg_temp_free(t2);
tcg_gen_brcondi_tl(TCG_COND_GE, t1, 0, l1);
tcg_temp_free(t1);
/* operands of same sign, result different sign */
generate_exception(ctx, EXCP_OVERFLOW);
gen_set_label(l1);
tcg_temp_free(r_tmp1);
tcg_gen_ext32s_tl(t0, t0);
gen_store_gpr(t0, rd);
tcg_temp_free(t0);
}
opn = "sub";
break;
case OPC_SUBU:
tcg_gen_sub_tl(t0, t0, t1);
tcg_gen_ext32s_tl(t0, t0);
if (rs != 0 && rt != 0) {
tcg_gen_sub_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
} else if (rs == 0 && rt != 0) {
tcg_gen_neg_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "subu";
break;
#if defined(TARGET_MIPS64)
case OPC_DADD:
{
TCGv r_tmp1 = tcg_temp_new();
TCGv r_tmp2 = tcg_temp_new();
TCGv t0 = tcg_temp_local_new();
TCGv t1 = tcg_temp_new();
TCGv t2 = tcg_temp_new();
int l1 = gen_new_label();
save_cpu_state(ctx, 1);
tcg_gen_mov_tl(r_tmp1, t0);
tcg_gen_add_tl(t0, t0, t1);
tcg_gen_xor_tl(r_tmp1, r_tmp1, t1);
tcg_gen_xori_tl(r_tmp1, r_tmp1, -1);
tcg_gen_xor_tl(r_tmp2, t0, t1);
tcg_gen_and_tl(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_brcondi_tl(TCG_COND_GE, r_tmp1, 0, l1);
gen_load_gpr(t1, rs);
gen_load_gpr(t2, rt);
tcg_gen_add_tl(t0, t1, t2);
tcg_gen_xor_tl(t1, t1, t2);
tcg_gen_not_tl(t1, t1);
tcg_gen_xor_tl(t2, t0, t2);
tcg_gen_and_tl(t1, t1, t2);
tcg_temp_free(t2);
tcg_gen_brcondi_tl(TCG_COND_GE, t1, 0, l1);
tcg_temp_free(t1);
/* operands of same sign, result different sign */
generate_exception(ctx, EXCP_OVERFLOW);
gen_set_label(l1);
tcg_temp_free(r_tmp1);
gen_store_gpr(t0, rd);
tcg_temp_free(t0);
}
opn = "dadd";
break;
case OPC_DADDU:
tcg_gen_add_tl(t0, t0, t1);
if (rs != 0 && rt != 0) {
tcg_gen_add_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
} else if (rs == 0 && rt != 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "daddu";
break;
case OPC_DSUB:
{
TCGv r_tmp1 = tcg_temp_new();
TCGv r_tmp2 = tcg_temp_new();
TCGv t0 = tcg_temp_local_new();
TCGv t1 = tcg_temp_new();
TCGv t2 = tcg_temp_new();
int l1 = gen_new_label();
save_cpu_state(ctx, 1);
tcg_gen_mov_tl(r_tmp1, t0);
tcg_gen_sub_tl(t0, t0, t1);
tcg_gen_xor_tl(r_tmp2, r_tmp1, t1);
tcg_gen_xor_tl(r_tmp1, r_tmp1, t0);
tcg_gen_and_tl(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free(r_tmp2);
tcg_gen_brcondi_tl(TCG_COND_GE, r_tmp1, 0, l1);
/* operands of different sign, first operand and result different sign */
gen_load_gpr(t1, rs);
gen_load_gpr(t2, rt);
tcg_gen_sub_tl(t0, t1, t2);
tcg_gen_xor_tl(t2, t1, t2);
tcg_gen_xor_tl(t1, t0, t1);
tcg_gen_and_tl(t1, t1, t2);
tcg_temp_free(t2);
tcg_gen_brcondi_tl(TCG_COND_GE, t1, 0, l1);
tcg_temp_free(t1);
/* operands of same sign, result different sign */
generate_exception(ctx, EXCP_OVERFLOW);
gen_set_label(l1);
tcg_temp_free(r_tmp1);
gen_store_gpr(t0, rd);
tcg_temp_free(t0);
}
opn = "dsub";
break;
case OPC_DSUBU:
tcg_gen_sub_tl(t0, t0, t1);
if (rs != 0 && rt != 0) {
tcg_gen_sub_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
} else if (rs == 0 && rt != 0) {
tcg_gen_neg_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "dsubu";
break;
#endif
case OPC_SLT:
gen_op_lt(t0, t0, t1);
opn = "slt";
case OPC_MUL:
if (likely(rs != 0 && rt != 0)) {
tcg_gen_mul_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
tcg_gen_ext32s_tl(cpu_gpr[rd], cpu_gpr[rd]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "mul";
break;
case OPC_SLTU:
gen_op_ltu(t0, t0, t1);
opn = "sltu";
}
MIPS_DEBUG("%s %s, %s, %s", opn, regnames[rd], regnames[rs], regnames[rt]);
}
/* Conditional move */
static void gen_cond_move (CPUState *env, uint32_t opc, int rd, int rs, int rt)
{
const char *opn = "cond move";
int l1;
if (rd == 0) {
/* If no destination, treat it as a NOP.
For add & sub, we must generate the overflow exception when needed. */
MIPS_DEBUG("NOP");
return;
}
l1 = gen_new_label();
switch (opc) {
case OPC_MOVN:
if (likely(rt != 0))
tcg_gen_brcondi_tl(TCG_COND_EQ, cpu_gpr[rt], 0, l1);
else
tcg_gen_br(l1);
opn = "movn";
break;
case OPC_MOVZ:
if (likely(rt != 0))
tcg_gen_brcondi_tl(TCG_COND_NE, cpu_gpr[rt], 0, l1);
opn = "movz";
break;
}
if (rs != 0)
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
else
tcg_gen_movi_tl(cpu_gpr[rd], 0);
gen_set_label(l1);
MIPS_DEBUG("%s %s, %s, %s", opn, regnames[rd], regnames[rs], regnames[rt]);
}
/* Logic */
static void gen_logic (CPUState *env, uint32_t opc, int rd, int rs, int rt)
{
const char *opn = "logic";
if (rd == 0) {
/* If no destination, treat it as a NOP. */
MIPS_DEBUG("NOP");
return;
}
switch (opc) {
case OPC_AND:
tcg_gen_and_tl(t0, t0, t1);
if (likely(rs != 0 && rt != 0)) {
tcg_gen_and_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "and";
break;
case OPC_NOR:
tcg_gen_nor_tl(t0, t0, t1);
if (rs != 0 && rt != 0) {
tcg_gen_nor_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
} else if (rs == 0 && rt != 0) {
tcg_gen_not_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_not_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], ~((target_ulong)0));
}
opn = "nor";
break;
case OPC_OR:
tcg_gen_or_tl(t0, t0, t1);
if (likely(rs != 0 && rt != 0)) {
tcg_gen_or_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
} else if (rs == 0 && rt != 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "or";
break;
case OPC_XOR:
tcg_gen_xor_tl(t0, t0, t1);
if (likely(rs != 0 && rt != 0)) {
tcg_gen_xor_tl(cpu_gpr[rd], cpu_gpr[rs], cpu_gpr[rt]);
} else if (rs == 0 && rt != 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rt]);
} else if (rs != 0 && rt == 0) {
tcg_gen_mov_tl(cpu_gpr[rd], cpu_gpr[rs]);
} else {
tcg_gen_movi_tl(cpu_gpr[rd], 0);
}
opn = "xor";
break;
case OPC_MUL:
tcg_gen_mul_tl(t0, t0, t1);
tcg_gen_ext32s_tl(t0, t0);
opn = "mul";
}
MIPS_DEBUG("%s %s, %s, %s", opn, regnames[rd], regnames[rs], regnames[rt]);
}
/* Set on lower than */
static void gen_slt (CPUState *env, uint32_t opc, int rd, int rs, int rt)
{
const char *opn = "slt";
TCGv t0, t1;
if (rd == 0) {
/* If no destination, treat it as a NOP. */
MIPS_DEBUG("NOP");
return;
}
t0 = tcg_temp_new();
t1 = tcg_temp_new();
gen_load_gpr(t0, rs);
gen_load_gpr(t1, rt);
switch (opc) {
case OPC_SLT:
gen_op_lt(cpu_gpr[rd], t0, t1);
opn = "slt";
break;
case OPC_MOVN:
{
int l1 = gen_new_label();
case OPC_SLTU:
gen_op_ltu(cpu_gpr[rd], t0, t1);
opn = "sltu";
break;
}
MIPS_DEBUG("%s %s, %s, %s", opn, regnames[rd], regnames[rs], regnames[rt]);
tcg_temp_free(t0);
tcg_temp_free(t1);
}
tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, l1);
gen_store_gpr(t0, rd);
gen_set_label(l1);
}
opn = "movn";
goto print;
case OPC_MOVZ:
{
int l1 = gen_new_label();
/* Shifts */
static void gen_shift (CPUState *env, DisasContext *ctx, uint32_t opc,
int rd, int rs, int rt)
{
const char *opn = "shifts";
TCGv t0, t1;
tcg_gen_brcondi_tl(TCG_COND_NE, t1, 0, l1);
gen_store_gpr(t0, rd);
gen_set_label(l1);
}
opn = "movz";
goto print;
if (rd == 0) {
/* If no destination, treat it as a NOP.
For add & sub, we must generate the overflow exception when needed. */
MIPS_DEBUG("NOP");
return;
}
t0 = tcg_temp_new();
t1 = tcg_temp_new();
gen_load_gpr(t0, rs);
gen_load_gpr(t1, rt);
switch (opc) {
case OPC_SLLV:
tcg_gen_andi_tl(t0, t0, 0x1f);
tcg_gen_shl_tl(t0, t1, t0);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(cpu_gpr[rd], t0);
opn = "sllv";
break;
case OPC_SRAV:
tcg_gen_ext32s_tl(t1, t1);
tcg_gen_andi_tl(t0, t0, 0x1f);
tcg_gen_sar_tl(t0, t1, t0);
tcg_gen_sar_tl(cpu_gpr[rd], t1, t0);
opn = "srav";
break;
case OPC_SRLV:
@ -1654,37 +1792,28 @@ static void gen_arith (CPUState *env, DisasContext *ctx, uint32_t opc,
tcg_gen_ext32u_tl(t1, t1);
tcg_gen_andi_tl(t0, t0, 0x1f);
tcg_gen_shr_tl(t0, t1, t0);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(cpu_gpr[rd], t0);
opn = "srlv";
break;
case 1:
/* rotrv is decoded as srlv on non-R2 CPUs */
if (env->insn_flags & ISA_MIPS32R2) {
int l1 = gen_new_label();
int l2 = gen_new_label();
TCGv_i32 t2 = tcg_temp_new_i32();
TCGv_i32 t3 = tcg_temp_new_i32();
tcg_gen_andi_tl(t0, t0, 0x1f);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, l1);
{
TCGv_i32 r_tmp1 = tcg_temp_new_i32();
TCGv_i32 r_tmp2 = tcg_temp_new_i32();
tcg_gen_trunc_tl_i32(r_tmp1, t0);
tcg_gen_trunc_tl_i32(r_tmp2, t1);
tcg_gen_rotr_i32(r_tmp1, r_tmp1, r_tmp2);
tcg_temp_free_i32(r_tmp1);
tcg_temp_free_i32(r_tmp2);
tcg_gen_br(l2);
}
gen_set_label(l1);
tcg_gen_mov_tl(t0, t1);
gen_set_label(l2);
tcg_gen_trunc_tl_i32(t2, t0);
tcg_gen_trunc_tl_i32(t3, t1);
tcg_gen_andi_i32(t2, t2, 0x1f);
tcg_gen_rotr_i32(t2, t3, t2);
tcg_gen_ext_i32_tl(cpu_gpr[rd], t2);
tcg_temp_free_i32(t2);
tcg_temp_free_i32(t3);
opn = "rotrv";
} else {
tcg_gen_ext32u_tl(t1, t1);
tcg_gen_andi_tl(t0, t0, 0x1f);
tcg_gen_shr_tl(t0, t1, t0);
tcg_gen_ext32s_tl(t0, t0);
tcg_gen_ext32s_tl(cpu_gpr[rd], t0);
opn = "srlv";
}
break;
@ -1697,36 +1826,26 @@ static void gen_arith (CPUState *env, DisasContext *ctx, uint32_t opc,
#if defined(TARGET_MIPS64)
case OPC_DSLLV:
tcg_gen_andi_tl(t0, t0, 0x3f);
tcg_gen_shl_tl(t0, t1, t0);
tcg_gen_shl_tl(cpu_gpr[rd], t1, t0);
opn = "dsllv";
break;
case OPC_DSRAV:
tcg_gen_andi_tl(t0, t0, 0x3f);
tcg_gen_sar_tl(t0, t1, t0);
tcg_gen_sar_tl(cpu_gpr[rd], t1, t0);
opn = "dsrav";
break;
case OPC_DSRLV:
switch ((ctx->opcode >> 6) & 0x1f) {
case 0:
tcg_gen_andi_tl(t0, t0, 0x3f);
tcg_gen_shr_tl(t0, t1, t0);
tcg_gen_shr_tl(cpu_gpr[rd], t1, t0);
opn = "dsrlv";
break;
case 1:
/* drotrv is decoded as dsrlv on non-R2 CPUs */
if (env->insn_flags & ISA_MIPS32R2) {
int l1 = gen_new_label();
int l2 = gen_new_label();
tcg_gen_andi_tl(t0, t0, 0x3f);
tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, l1);
{
tcg_gen_rotr_tl(t0, t1, t0);
tcg_gen_br(l2);
}
gen_set_label(l1);
tcg_gen_mov_tl(t0, t1);
gen_set_label(l2);
tcg_gen_rotr_tl(cpu_gpr[rd], t1, t0);
opn = "drotrv";
} else {
tcg_gen_andi_tl(t0, t0, 0x3f);
@ -1741,15 +1860,8 @@ static void gen_arith (CPUState *env, DisasContext *ctx, uint32_t opc,
}
break;
#endif
default:
MIPS_INVAL(opn);
generate_exception(ctx, EXCP_RI);
goto out;
}
gen_store_gpr(t0, rd);
print:
MIPS_DEBUG("%s %s, %s, %s", opn, regnames[rd], regnames[rs], regnames[rt]);
out:
tcg_temp_free(t0);
tcg_temp_free(t1);
}
@ -7465,14 +7577,29 @@ static void decode_opc (CPUState *env, DisasContext *ctx)
case OPC_SRL ... OPC_SRA:
gen_arith_imm(env, ctx, op1, rd, rt, sa);
break;
case OPC_MOVZ ... OPC_MOVN:
case OPC_MOVN: /* Conditional move */
case OPC_MOVZ:
check_insn(env, ctx, ISA_MIPS4 | ISA_MIPS32);
case OPC_SLLV: /* Arithmetic */
case OPC_SRLV ... OPC_SRAV:
case OPC_ADD ... OPC_NOR:
case OPC_SLT ... OPC_SLTU:
gen_cond_move(env, op1, rd, rs, rt);
break;
case OPC_ADD ... OPC_SUBU:
gen_arith(env, ctx, op1, rd, rs, rt);
break;
case OPC_SLLV: /* Shifts */
case OPC_SRLV:
case OPC_SRAV:
gen_shift(env, ctx, op1, rd, rs, rt);
break;
case OPC_SLT: /* Set on less than */
case OPC_SLTU:
gen_slt(env, op1, rd, rs, rt);
break;
case OPC_AND: /* Logic*/
case OPC_OR:
case OPC_NOR:
case OPC_XOR:
gen_logic(env, op1, rd, rs, rt);
break;
case OPC_MULT ... OPC_DIVU:
if (sa) {
check_insn(env, ctx, INSN_VR54XX);
@ -7545,13 +7672,18 @@ static void decode_opc (CPUState *env, DisasContext *ctx)
check_mips_64(ctx);
gen_arith_imm(env, ctx, op1, rd, rt, sa);
break;
case OPC_DSLLV:
case OPC_DSRLV ... OPC_DSRAV:
case OPC_DADD ... OPC_DSUBU:
check_insn(env, ctx, ISA_MIPS3);
check_mips_64(ctx);
gen_arith(env, ctx, op1, rd, rs, rt);
break;
case OPC_DSLLV:
case OPC_DSRAV:
case OPC_DSRLV:
check_insn(env, ctx, ISA_MIPS3);
check_mips_64(ctx);
gen_shift(env, ctx, op1, rd, rs, rt);
break;
case OPC_DMULT ... OPC_DDIVU:
check_insn(env, ctx, ISA_MIPS3);
check_mips_64(ctx);