From: Aurelien Jarno <aurelien@aurel32.net>
Date: Tue, 26 Mar 2013 18:56:02 +0000 (+0100)
Subject: target-i386: SSE4.2: fix pcmpXstrX instructions with "Masked(-)" polarity
X-Git-Tag: v1.5.0-rc0~367
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e4eba27e29114842978234a44c92b2a945a6b46d;p=thirdparty%2Fqemu.git

target-i386: SSE4.2: fix pcmpXstrX instructions with "Masked(-)" polarity

valids can equals to -1 if the reg/mem string is empty. Change the
expression to have an empty xor mask in that case.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---

diff --git a/target-i386/ops_sse.h b/target-i386/ops_sse.h
index 77ab410b9ea..a0bac07ba3c 100644
--- a/target-i386/ops_sse.h
+++ b/target-i386/ops_sse.h
@@ -2050,7 +2050,7 @@ static inline unsigned pcmpxstrx(CPUX86State *env, Reg *d, Reg *s,
         res ^= (2 << upper) - 1;
         break;
     case 3:
-        res ^= (2 << valids) - 1;
+        res ^= (1 << (valids + 1)) - 1;
         break;
     }