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[PATCH 1/3] target/i386: Do not apply REX to MMX operands
From: |
Richard Henderson |
Subject: |
[PATCH 1/3] target/i386: Do not apply REX to MMX operands |
Date: |
Mon, 12 Aug 2024 12:58:42 +1000 |
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>
---
target/i386/tcg/decode-new.c.inc | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc
index b22210f45d..03138b3876 100644
--- a/target/i386/tcg/decode-new.c.inc
+++ b/target/i386/tcg/decode-new.c.inc
@@ -1979,7 +1979,10 @@ static bool decode_op(DisasContext *s, CPUX86State *env,
X86DecodedInsn *decode,
op->unit = X86_OP_SSE;
}
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;
case X86_TYPE_E: /* ALU modrm operand */
--
2.43.0
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