From: Julian Seward <jseward@acm.org>
Date: Wed, 22 Nov 2006 23:31:37 +0000 (+0000)
Subject: Specialise computation of carry flag after ADDL.
X-Git-Tag: svn/VALGRIND_3_3_1^2~80
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=14c999d4fe801db09587fd936efc698202e207f2;p=thirdparty%2Fvalgrind.git

Specialise computation of carry flag after ADDL.


git-svn-id: svn://svn.valgrind.org/vex/trunk@1683
---

diff --git a/VEX/priv/guest-x86/ghelpers.c b/VEX/priv/guest-x86/ghelpers.c
index ef9273dd02..3a490f2372 100644
--- a/VEX/priv/guest-x86/ghelpers.c
+++ b/VEX/priv/guest-x86/ghelpers.c
@@ -1263,6 +1263,13 @@ IRExpr* guest_x86_spechelper ( HChar* function_name,
                mkU32(1)
             );
       }
+      if (isU32(cc_op, X86G_CC_OP_ADDL)) {
+         /* C after add denotes sum <u either arg */
+         return unop(Iop_1Uto32,
+                     binop(Iop_CmpLT32U, 
+                           binop(Iop_Add32, cc_dep1, cc_dep2), 
+                           cc_dep1));
+      }
 #     if 0
       if (cc_op->tag == Iex_Const) {
          vex_printf("CFLAG "); ppIRExpr(cc_op); vex_printf("\n");