Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
target/i386/tcg/decode-new.c.inc | 116 ++++++++++++++++++
target/i386/tcg/decode-new.h | 3 +
target/i386/tcg/emit.c.inc | 203 +++++++++++++++++++++++++++++++
target/i386/tcg/translate.c | 2 +-
4 files changed, 323 insertions(+), 1 deletion(-)
diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc
index 2f614e2a6f0..dc596ba9f7a 100644
--- a/target/i386/tcg/decode-new.c.inc
+++ b/target/i386/tcg/decode-new.c.inc
@@ -102,6 +102,8 @@
#define X86_OP_GROUP2(op, op0, s0, op1, s1, ...) \
X86_OP_GROUP3(op, op0, s0, 2op, s0, op1, s1, ## __VA_ARGS__)
+#define X86_OP_GROUPw(op, op0, s0, ...) \
+ X86_OP_GROUP3(op, op0, s0, None, None, None, None, ## __VA_ARGS__)
#define X86_OP_GROUP0(op, ...) \
X86_OP_GROUP3(op, None, None, None, None, None, None, ## __VA_ARGS__)
@@ -127,10 +129,13 @@
X86_OP_ENTRY3(op, op0, s0, None, None, None, None, ## __VA_ARGS__)
#define X86_OP_ENTRYr(op, op0, s0, ...) \
X86_OP_ENTRY3(op, None, None, None, None, op0, s0, ## __VA_ARGS__)
+#define X86_OP_ENTRY1(op, op0, s0, ...) \
+ X86_OP_ENTRY3(op, op0, s0, 2op, s0, None, None, ## __VA_ARGS__)
#define X86_OP_ENTRY0(op, ...) \
X86_OP_ENTRY3(op, None, None, None, None, None, None, ## __VA_ARGS__)
#define cpuid(feat) .cpuid = X86_FEAT_##feat,
+#define nowb .special = X86_SPECIAL_NoWriteback,
#define xchg .special = X86_SPECIAL_Locked,
#define mmx .special = X86_SPECIAL_MMX,
#define zext0 .special = X86_SPECIAL_ZExtOp0,
@@ -1074,7 +1079,114 @@ static void decode_0F(DisasContext *s, CPUX86State *env, X86OpEntry *entry, uint
}
static const X86OpEntry opcodes_root[256] = {
+ [0x00] = X86_OP_ENTRY2(ADD, E,b, G,b),
+ [0x01] = X86_OP_ENTRY2(ADD, E,v, G,v),
+ [0x02] = X86_OP_ENTRY2(ADD, G,b, E,b),
+ [0x03] = X86_OP_ENTRY2(ADD, G,v, E,v),
+ [0x04] = X86_OP_ENTRY2(ADD, 0,b, I,b), /* AL, Ib */
+ [0x05] = X86_OP_ENTRY2(ADD, 0,v, I,z), /* rAX, Iz */
+ [0x06] = X86_OP_ENTRYr(PUSH, ES, w, chk(i64)),
+ [0x07] = X86_OP_ENTRYw(POP, ES, w, chk(i64)),
+
+ [0x10] = X86_OP_ENTRY2(ADC, E,b, G,b),
+ [0x11] = X86_OP_ENTRY2(ADC, E,v, G,v),
+ [0x12] = X86_OP_ENTRY2(ADC, G,b, E,b),
+ [0x13] = X86_OP_ENTRY2(ADC, G,v, E,v),
+ [0x14] = X86_OP_ENTRY2(ADC, 0,b, I,b), /* AL, Ib */
+ [0x15] = X86_OP_ENTRY2(ADC, 0,v, I,z), /* rAX, Iz */
+ [0x16] = X86_OP_ENTRYr(PUSH, SS, w, chk(i64)),
+ [0x17] = X86_OP_ENTRYw(POP, SS, w, chk(i64)),
+
+ [0x20] = X86_OP_ENTRY2(AND, E,b, G,b),
+ [0x21] = X86_OP_ENTRY2(AND, E,v, G,v),
+ [0x22] = X86_OP_ENTRY2(AND, G,b, E,b),
+ [0x23] = X86_OP_ENTRY2(AND, G,v, E,v),
+ [0x24] = X86_OP_ENTRY2(AND, 0,b, I,b), /* AL, Ib */
+ [0x25] = X86_OP_ENTRY2(AND, 0,v, I,z), /* rAX, Iz */
+ [0x26] = {},
+ [0x27] = X86_OP_ENTRY0(DAA, chk(i64)),
+
+ [0x30] = X86_OP_ENTRY2(XOR, E,b, G,b),
+ [0x31] = X86_OP_ENTRY2(XOR, E,v, G,v),
+ [0x32] = X86_OP_ENTRY2(XOR, G,b, E,b),
+ [0x33] = X86_OP_ENTRY2(XOR, G,v, E,v),
+ [0x34] = X86_OP_ENTRY2(XOR, 0,b, I,b), /* AL, Ib */
+ [0x35] = X86_OP_ENTRY2(XOR, 0,v, I,z), /* rAX, Iz */
+ [0x36] = {},
+ [0x37] = X86_OP_ENTRY0(AAA, chk(i64)),
+
+ [0x40] = X86_OP_ENTRY1(INC, 0,v, chk(i64)),
+ [0x41] = X86_OP_ENTRY1(INC, 1,v, chk(i64)),
+ [0x42] = X86_OP_ENTRY1(INC, 2,v, chk(i64)),
+ [0x43] = X86_OP_ENTRY1(INC, 3,v, chk(i64)),
+ [0x44] = X86_OP_ENTRY1(INC, 4,v, chk(i64)),
+ [0x45] = X86_OP_ENTRY1(INC, 5,v, chk(i64)),
+ [0x46] = X86_OP_ENTRY1(INC, 6,v, chk(i64)),
+ [0x47] = X86_OP_ENTRY1(INC, 7,v, chk(i64)),
+
+ [0x50] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x51] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x52] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x53] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x54] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x55] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x56] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+ [0x57] = X86_OP_ENTRYr(PUSH, LoBits,d64),
+
+
+ [0x08] = X86_OP_ENTRY2(OR, E,b, G,b),
+ [0x09] = X86_OP_ENTRY2(OR, E,v, G,v),
+ [0x0A] = X86_OP_ENTRY2(OR, G,b, E,b),
+ [0x0B] = X86_OP_ENTRY2(OR, G,v, E,v),
+ [0x0C] = X86_OP_ENTRY2(OR, 0,b, I,b), /* AL, Ib */
+ [0x0D] = X86_OP_ENTRY2(OR, 0,v, I,z), /* rAX, Iz */
+ [0x0E] = X86_OP_ENTRYr(PUSH, CS, w, chk(i64)),
[0x0F] = X86_OP_GROUP0(0F),
+
+ [0x18] = X86_OP_ENTRY2(SBB, E,b, G,b),
+ [0x19] = X86_OP_ENTRY2(SBB, E,v, G,v),
+ [0x1A] = X86_OP_ENTRY2(SBB, G,b, E,b),
+ [0x1B] = X86_OP_ENTRY2(SBB, G,v, E,v),
+ [0x1C] = X86_OP_ENTRY2(SBB, 0,b, I,b), /* AL, Ib */
+ [0x1D] = X86_OP_ENTRY2(SBB, 0,v, I,z), /* rAX, Iz */
+ [0x1E] = X86_OP_ENTRYr(PUSH, DS, w, chk(i64)),
+ [0x1F] = X86_OP_ENTRYw(POP, DS, w, chk(i64)),
+
+ [0x28] = X86_OP_ENTRY2(SUB, E,b, G,b),
+ [0x29] = X86_OP_ENTRY2(SUB, E,v, G,v),
+ [0x2A] = X86_OP_ENTRY2(SUB, G,b, E,b),
+ [0x2B] = X86_OP_ENTRY2(SUB, G,v, E,v),
+ [0x2C] = X86_OP_ENTRY2(SUB, 0,b, I,b), /* AL, Ib */
+ [0x2D] = X86_OP_ENTRY2(SUB, 0,v, I,z), /* rAX, Iz */
+ [0x2E] = {},
+ [0x2F] = X86_OP_ENTRY0(DAS, chk(i64)),
+
+ [0x38] = X86_OP_ENTRY2(SUB, E,b, G,b, nowb),
+ [0x39] = X86_OP_ENTRY2(SUB, E,v, G,v, nowb),
+ [0x3A] = X86_OP_ENTRY2(SUB, G,b, E,b, nowb),
+ [0x3B] = X86_OP_ENTRY2(SUB, G,v, E,v, nowb),
+ [0x3C] = X86_OP_ENTRY2(SUB, 0,b, I,b, nowb), /* AL, Ib */
+ [0x3D] = X86_OP_ENTRY2(SUB, 0,v, I,z, nowb), /* rAX, Iz */
+ [0x3E] = {},
+ [0x3F] = X86_OP_ENTRY0(AAS, chk(i64)),
+
+ [0x48] = X86_OP_ENTRY1(DEC, 0,v, chk(i64)),
+ [0x49] = X86_OP_ENTRY1(DEC, 1,v, chk(i64)),
+ [0x4A] = X86_OP_ENTRY1(DEC, 2,v, chk(i64)),
+ [0x4B] = X86_OP_ENTRY1(DEC, 3,v, chk(i64)),
+ [0x4C] = X86_OP_ENTRY1(DEC, 4,v, chk(i64)),
+ [0x4D] = X86_OP_ENTRY1(DEC, 5,v, chk(i64)),
+ [0x4E] = X86_OP_ENTRY1(DEC, 6,v, chk(i64)),
+ [0x4F] = X86_OP_ENTRY1(DEC, 7,v, chk(i64)),
+
+ [0x58] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x59] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x5A] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x5B] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x5C] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x5D] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x5E] = X86_OP_ENTRYw(POP, LoBits,d64),
+ [0x5F] = X86_OP_ENTRYw(POP, LoBits,d64),
};
#undef mmx
@@ -1898,6 +2010,10 @@ static void disas_insn_new(DisasContext *s, CPUState *cpu, int b)
}
break;
+ case X86_SPECIAL_NoWriteback:
+ decode.op[0].unit = X86_OP_SKIP;
+ break;
+
case X86_SPECIAL_ZExtOp0:
assert(decode.op[0].unit == X86_OP_INT);
if (!decode.op[0].has_ea) {
diff --git a/target/i386/tcg/decode-new.h b/target/i386/tcg/decode-new.h
index 15233fad62f..a3983794ac5 100644
--- a/target/i386/tcg/decode-new.h
+++ b/target/i386/tcg/decode-new.h
@@ -161,6 +161,9 @@ typedef enum X86InsnSpecial {
/* Always locked if it has a memory operand (XCHG) */
X86_SPECIAL_Locked,
+ /* Writeback not needed or done manually in the callback */
+ X86_SPECIAL_NoWriteback,
+
/*
* Register operand 0/2 is zero extended to 32 bits. Rd/Mb or Rd/Mw
* in the manual.
diff --git a/target/i386/tcg/emit.c.inc b/target/i386/tcg/emit.c.inc
index dd77a8c5511..6b9f518cc94 100644
--- a/target/i386/tcg/emit.c.inc
+++ b/target/i386/tcg/emit.c.inc
@@ -329,6 +329,27 @@ static void prepare_update1_cc(X86DecodedInsn *decode, DisasContext *s, CCOp op)
decode->cc_op = op;
}
+static void prepare_update2_cc(X86DecodedInsn *decode, DisasContext *s, CCOp op)
+{
+ decode->cc_src = s->T1;
+ decode->cc_dst = s->T0;
+ decode->cc_op = op;
+}
+
+static void prepare_update_cc_incdec(X86DecodedInsn *decode, DisasContext *s, CCOp op)
+{
+ gen_compute_eflags_c(s, s->T1);
+ prepare_update2_cc(decode, s, op);
+}
+
+static void prepare_update3_cc(X86DecodedInsn *decode, DisasContext *s, CCOp op, TCGv reg)
+{
+ decode->cc_src2 = reg;
+ decode->cc_src = s->T1;
+ decode->cc_dst = s->T0;
+ decode->cc_op = op;
+}
+
static void gen_store_sse(DisasContext *s, X86DecodedInsn *decode, int src_ofs)
{
MemOp ot = decode->op[0].ot;
@@ -1017,6 +1038,36 @@ static void gen_##uname(DisasContext *s, CPUX86State *env, X86DecodedInsn *decod
VSIB_AVX(VPGATHERD, vpgatherd)
VSIB_AVX(VPGATHERQ, vpgatherq)
+static void gen_AAA(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ gen_update_cc_op(s);
+ gen_helper_aaa(tcg_env);
+ set_cc_op(s, CC_OP_EFLAGS);
+}
+
+static void gen_AAS(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ gen_update_cc_op(s);
+ gen_helper_aas(tcg_env);
+ set_cc_op(s, CC_OP_EFLAGS);
+}
+
+static void gen_ADC(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ gen_compute_eflags_c(s, s->tmp4);
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_add_tl(s->T0, s->tmp4, s->T1);
+ tcg_gen_atomic_add_fetch_tl(s->T0, s->A0, s->T0,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_add_tl(s->T0, s->T0, s->T1);
+ tcg_gen_add_tl(s->T0, s->T0, s->tmp4);
+ }
+ prepare_update3_cc(decode, s, CC_OP_ADCB + ot, s->tmp4);
+}
+
/* ADCX/ADOX do not have memory operands and can use set_cc_op. */
static void gen_ADCOX(DisasContext *s, CPUX86State *env, MemOp ot, int cc_op)
{
@@ -1070,11 +1121,37 @@ static void gen_ADCX(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
gen_ADCOX(s, env, decode->op[0].ot, CC_OP_ADCX);
}
+static void gen_ADD(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_atomic_add_fetch_tl(s->T0, s->A0, s->T1,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_add_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update2_cc(decode, s, CC_OP_ADDB + ot);
+}
+
static void gen_ADOX(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
gen_ADCOX(s, env, decode->op[0].ot, CC_OP_ADOX);
}
+static void gen_AND(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_atomic_and_fetch_tl(s->T0, s->A0, s->T1,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_and_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update1_cc(decode, s, CC_OP_LOGICB + ot);
+}
+
static void gen_ANDN(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
MemOp ot = decode->op[0].ot;
@@ -1308,6 +1385,34 @@ static void gen_CVTTPx2PI(DisasContext *s, CPUX86State *env, X86DecodedInsn *dec
}
}
+static void gen_DAA(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ gen_update_cc_op(s);
+ gen_helper_daa(tcg_env);
+ set_cc_op(s, CC_OP_EFLAGS);
+}
+
+static void gen_DAS(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ gen_update_cc_op(s);
+ gen_helper_das(tcg_env);
+ set_cc_op(s, CC_OP_EFLAGS);
+}
+
+static void gen_DEC(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ tcg_gen_movi_tl(s->T1, -1);
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_atomic_add_fetch_tl(s->T0, s->A0, s->T1,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_add_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update_cc_incdec(decode, s, CC_OP_DECB + ot);
+}
+
static void gen_EMMS(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
gen_helper_emms(tcg_env);
@@ -1326,6 +1431,20 @@ static void gen_EXTRQ_r(DisasContext *s, CPUX86State *env, X86DecodedInsn *decod
gen_helper_extrq_r(tcg_env, OP_PTR0, OP_PTR2);
}
+static void gen_INC(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ tcg_gen_movi_tl(s->T1, 1);
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_atomic_add_fetch_tl(s->T0, s->A0, s->T1,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_add_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update_cc_incdec(decode, s, CC_OP_INCB + ot);
+}
+
static void gen_INSERTQ_i(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
TCGv_i32 length = tcg_constant_i32(decode->immediate & 63);
@@ -1477,6 +1596,19 @@ static void gen_MULX(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
}
+static void gen_OR(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_atomic_or_fetch_tl(s->T0, s->A0, s->T1,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_or_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update1_cc(decode, s, CC_OP_LOGICB + ot);
+}
+
static void gen_PALIGNR(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
TCGv_i32 imm = tcg_constant8u_i32(decode->immediate);
@@ -1728,6 +1860,18 @@ static void gen_PMOVMSKB(DisasContext *s, CPUX86State *env, X86DecodedInsn *deco
}
}
+static void gen_POP(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = gen_pop_T0(s);
+ if (decode->op[0].has_ea) {
+ /* NOTE: order is important for MMU exceptions */
+ gen_op_st_v(s, ot, s->T0, s->A0);
+ decode->op[0].unit = X86_OP_SKIP;
+ }
+ /* NOTE: writing back registers after update is important for pop %sp */
+ gen_pop_update(s, ot);
+}
+
static void gen_PSHUFW(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
TCGv_i32 imm = tcg_constant8u_i32(decode->immediate);
@@ -1874,6 +2018,11 @@ static void gen_PSLLDQ_i(DisasContext *s, CPUX86State *env, X86DecodedInsn *deco
}
}
+static void gen_PUSH(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ gen_push_v(s, s->T1);
+}
+
static void gen_RORX(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
MemOp ot = decode->op[0].ot;
@@ -1901,6 +2050,23 @@ static void gen_SARX(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
tcg_gen_sar_tl(s->T0, s->T0, s->T1);
}
+static void gen_SBB(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ gen_compute_eflags_c(s, s->tmp4);
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_add_tl(s->T0, s->T1, s->tmp4);
+ tcg_gen_neg_tl(s->T0, s->T0);
+ tcg_gen_atomic_add_fetch_tl(s->T0, s->A0, s->T0,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_sub_tl(s->T0, s->T0, s->T1);
+ tcg_gen_sub_tl(s->T0, s->T0, s->tmp4);
+ }
+ prepare_update3_cc(decode, s, CC_OP_SBBB + ot, s->tmp4);
+}
+
static void gen_SHA1NEXTE(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
gen_helper_sha1nexte(OP_PTR0, OP_PTR1, OP_PTR2);
@@ -1991,6 +2157,22 @@ static void gen_STMXCSR(DisasContext *s, CPUX86State *env, X86DecodedInsn *decod
tcg_gen_ld32u_tl(s->T0, tcg_env, offsetof(CPUX86State, mxcsr));
}
+static void gen_SUB(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ MemOp ot = decode->op[0].ot;
+
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_neg_tl(s->T0, s->T1);
+ tcg_gen_atomic_fetch_add_tl(s->cc_srcT, s->A0, s->T0,
+ s->mem_index, ot | MO_LE);
+ tcg_gen_sub_tl(s->T0, s->cc_srcT, s->T1);
+ } else {
+ tcg_gen_mov_tl(s->cc_srcT, s->T0);
+ tcg_gen_sub_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update2_cc(decode, s, CC_OP_SUBB + ot);
+}
+
static void gen_VAESIMC(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
{
assert(!s->vex_l);
@@ -2470,3 +2652,24 @@ static void gen_VZEROUPPER(DisasContext *s, CPUX86State *env, X86DecodedInsn *de
tcg_gen_gvec_dup_imm(MO_64, offset, 16, 16, 0);
}
}
+
+static void gen_XOR(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode)
+{
+ /* special case XOR reg, reg */
+ if (decode->op[1].unit == X86_OP_INT &&
+ decode->op[2].unit == X86_OP_INT &&
+ decode->op[1].n == decode->op[2].n) {
+ tcg_gen_movi_tl(s->T0, 0);
+ set_cc_op(s, CC_OP_CLR);
+ } else {
+ MemOp ot = decode->op[0].ot;
+
+ if (s->prefix & PREFIX_LOCK) {
+ tcg_gen_atomic_xor_fetch_tl(s->T0, s->A0, s->T1,
+ s->mem_index, ot | MO_LE);
+ } else {
+ tcg_gen_xor_tl(s->T0, s->T0, s->T1);
+ }
+ prepare_update1_cc(decode, s, CC_OP_LOGICB + ot);
+ }
+}
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 080b56840da..e13bf7df591 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -3156,7 +3156,7 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
#ifndef CONFIG_USER_ONLY
use_new &= b <= limit;
#endif
- if (use_new && 0) {
+ if (use_new && b <= 0x5f) {
disas_insn_new(s, cpu, b);
return true;
}
--
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