From 9f927af3d53aee387c9a930b010da8c15e1e2fb5 Mon Sep 17 00:00:00 2001
From: Florian Krohm <florian@eich-krohm.de>
Date: Sun, 1 Sep 2013 20:17:23 +0000
Subject: [PATCH] Add an optimisation for Iop_Left64.

git-svn-id: svn://svn.valgrind.org/vex/trunk@2747
---
 VEX/priv/ir_opt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/VEX/priv/ir_opt.c b/VEX/priv/ir_opt.c
index f368ce5e38..5982495e94 100644
--- a/VEX/priv/ir_opt.c
+++ b/VEX/priv/ir_opt.c
@@ -5065,6 +5065,11 @@ static IRExpr* fold_IRExpr_Unop ( IROp op, IRExpr* aa )
       if (is_Unop(aa, Iop_Left32))
          return IRExpr_Unop( Iop_Left32, aa->Iex.Unop.arg );
       break;
+   case Iop_Left64:
+      /* Left64( Left64(x) ) --> Left64(x) */
+      if (is_Unop(aa, Iop_Left64))
+         return IRExpr_Unop( Iop_Left64, aa->Iex.Unop.arg );
+      break;
    case Iop_32to1:
       /* 32to1( 1Uto32 ( x ) ) --> x */
       if (is_Unop(aa, Iop_1Uto32))
-- 
2.47.2