diff mbox series

[Stable-7.2.14,37/40] target/i386: Do not apply REX to MMX operands

Message ID 20240906051633.10288-37-mjt@tls.msk.ru (mailing list archive)
State New, archived
Headers show
Series Patch Round-up for stable 7.2.14, freeze on 2024-09-16 | expand

Commit Message

Michael Tokarev Sept. 6, 2024, 5:16 a.m. UTC 
From: Richard Henderson <richard.henderson@linaro.org>

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>
(cherry picked from commit 416f2b16c02c618c0f233372ebfe343f9ee667d4)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff mbox series

Patch

diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc
index 1dfc368456..88de92ed16 100644
--- a/target/i386/tcg/decode-new.c.inc
+++ b/target/i386/tcg/decode-new.c.inc
@@ -1176,7 +1176,10 @@  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 */