From: Julian Seward <jseward@acm.org>
Date: Wed, 6 Apr 2005 01:45:44 +0000 (+0000)
Subject: As per r1121, avoid WaW stalls writing the guest state for movss mem->reg.
X-Git-Tag: svn/VALGRIND_3_0_1^2~211
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4ee879ef2e75d11b7f6387718f054801e56fd7b5;p=thirdparty%2Fvalgrind.git

As per r1121, avoid WaW stalls writing the guest state for movss mem->reg.


git-svn-id: svn://svn.valgrind.org/vex/trunk@1123
---

diff --git a/VEX/priv/guest-x86/toIR.c b/VEX/priv/guest-x86/toIR.c
index 5dd7638fe6..1b4681fd1b 100644
--- a/VEX/priv/guest-x86/toIR.c
+++ b/VEX/priv/guest-x86/toIR.c
@@ -7805,7 +7805,11 @@ DisResult disInstr ( /*IN*/  Bool       resteerOK,
          delta += 3+1;
       } else {
          addr = disAMode ( &alen, sorb, delta+3, dis_buf );
-         putXMMReg( gregOfRM(modrm), mkV128(0) );
+         /* zero bits 127:64 */
+         putXMMRegLane64( gregOfRM(modrm), 1, mkU64(0) ); 
+         /* zero bits 63:32 */
+         putXMMRegLane32( gregOfRM(modrm), 1, mkU32(0) ); 
+         /* write bits 31:0 */
          putXMMRegLane32( gregOfRM(modrm), 0,
                           loadLE(Ity_I32, mkexpr(addr)) );
          DIP("movss %s,%s\n", dis_buf,
@@ -9278,7 +9282,9 @@ DisResult disInstr ( /*IN*/  Bool       resteerOK,
          delta += 3+1;
       } else {
          addr = disAMode ( &alen, sorb, delta+3, dis_buf );
+         /* zero bits 127:64 */
          putXMMRegLane64( gregOfRM(modrm), 1, mkU64(0) );
+         /* write bits 63:0 */
          putXMMRegLane64( gregOfRM(modrm), 0,
                           loadLE(Ity_I64, mkexpr(addr)) );
          DIP("movsd %s,%s\n", dis_buf,