From 117477e28b8bf3b0f00ff5ce57e65c3162af8862 Mon Sep 17 00:00:00 2001
From: Zhou Sheng <zhousheng00@gmail.com>
Date: Wed, 28 Mar 2007 17:38:21 +0000
Subject: [PATCH] Avoid unnecessary APInt construction.

llvm-svn: 35431
---
 llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
index 907e8dc87ad0..d72783a0de69 100644
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -734,11 +734,10 @@ static void ComputeMaskedBits(Value *V, const APInt &Mask, APInt& KnownZero,
 
     // If the sign bit of the input is known set or clear, then we know the
     // top bits of the result.
-    APInt NewBits(APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth));
     if (KnownZero[SrcBitWidth-1])             // Input sign bit known zero
-      KnownZero |= NewBits;
+      KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
     else if (KnownOne[SrcBitWidth-1])           // Input sign bit known set
-      KnownOne |= NewBits;
+      KnownOne |= APInt::getHighBitsSet(BitWidth, BitWidth - SrcBitWidth);
     return;
   }
   case Instruction::Shl: