From: Julian Seward <jseward@acm.org>
Date: Wed, 20 Jul 2005 01:12:48 +0000 (+0000)
Subject: Specialise NZ after ANDL/ORL/XORL.  This fixes #109314.
X-Git-Tag: svn/VALGRIND_3_0_1^2~54
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=218719fbd3e8f232567846348298bfa500f27a2c;p=thirdparty%2Fvalgrind.git

Specialise NZ after ANDL/ORL/XORL.  This fixes #109314.


git-svn-id: svn://svn.valgrind.org/vex/trunk@1280
---

diff --git a/VEX/priv/guest-amd64/ghelpers.c b/VEX/priv/guest-amd64/ghelpers.c
index 77022f0ded..5ffc209287 100644
--- a/VEX/priv/guest-amd64/ghelpers.c
+++ b/VEX/priv/guest-amd64/ghelpers.c
@@ -996,6 +996,14 @@ IRExpr* guest_amd64_spechelper ( HChar* function_name,
                            mkU64(0)));
       }
 
+      if (isU64(cc_op, AMD64G_CC_OP_LOGICL) && isU64(cond, AMD64CondNZ)) {
+         /* long and/or/xor, then NZ --> test dst!=0 */
+         return unop(Iop_1Uto64,
+                     binop(Iop_CmpNE64, 
+                           binop(Iop_Shl64,cc_dep1,mkU8(32)), 
+                           mkU64(0)));
+      }
+
 //..       if (isU32(cc_op, AMD64G_CC_OP_LOGICL) && isU32(cond, X86CondS)) {
 //..          /* long and/or/xor, then S --> test dst <s 0 */
 //..          return unop(Iop_1Uto32,binop(Iop_CmpLT32S, cc_dep1, mkU32(0)));