From: Julian Seward <jseward@acm.org>
Date: Thu, 20 Jan 2005 10:48:20 +0000 (+0000)
Subject: Fix performance hole exposed by profiling gzip.
X-Git-Tag: svn/VALGRIND_3_0_1^2~611
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ca81a4f6bbc2fa71c5f7c3f6173a6edca4f9d135;p=thirdparty%2Fvalgrind.git

Fix performance hole exposed by profiling gzip.


git-svn-id: svn://svn.valgrind.org/vex/trunk@723
---

diff --git a/VEX/priv/guest-x86/ghelpers.c b/VEX/priv/guest-x86/ghelpers.c
index 6735e13aea..14803b808b 100644
--- a/VEX/priv/guest-x86/ghelpers.c
+++ b/VEX/priv/guest-x86/ghelpers.c
@@ -711,6 +711,15 @@ IRExpr* guest_x86_spechelper ( Char* function_name,
          /* If the thunk is dec or inc, the cflag is supplied as CC_NDEP. */
          return cc_ndep;
       }
+      if (isU32(cc_op, X86G_CC_OP_COPY)) {
+         /* cflag after COPY is stored in DEP1. */
+         return
+            binop(
+               Iop_And32,
+               binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_C)),
+               mkU32(1)
+            );
+      }
 #     if 0
       if (cc_op->tag == Iex_Const) {
          vex_printf("CFLAG "); ppIRExpr(cc_op); vex_printf("\n");