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target/i386: Do not apply REX to MMX operands

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Cc: qemu-stable@nongnu.org
Fixes: b3e22b2318a ("target/i386: add core of new i386 decoder")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2495
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Link: https://lore.kernel.org/r/20240812025844.58956-2-richard.henderson@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard Henderson 2024-08-12 12:58:42 +10:00 committed by Paolo Bonzini
parent fe68cc0923
commit 416f2b16c0
1 changed files with 4 additions and 1 deletions
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target/i386/tcg/decode-new.c.inc
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@ -1979,7 +1979,10 @@ static bool decode_op(DisasContext *s, CPUX86State *env, X86DecodedInsn *decode,
op->unit = X86_OP_SSE; op->unit = X86_OP_SSE;
} }
get_reg: get_reg:
op->n = ((get_modrm(s, env) >> 3) & 7) | REX_R(s); op->n = ((get_modrm(s, env) >> 3) & 7);
if (op->unit != X86_OP_MMX) {
op->n |= REX_R(s);
}
break; break;
case X86_TYPE_E: /* ALU modrm operand */ case X86_TYPE_E: /* ALU modrm operand */