From a5bc618a916dec01739599a780beebcdd380a4aa Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 26 Nov 2009 22:08:06 +0000
Subject: [PATCH] fix crash on Transforms/InstCombine/intrinsics.ll introduced
 by r89970

llvm-svn: 89972
---
 llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
index f997d60a85ee..c7ab9df57224 100644
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -9877,12 +9877,15 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
     const IntegerType *IT = cast<IntegerType>(II->getOperand(1)->getType());
     uint32_t BitWidth = IT->getBitWidth();
     APInt Mask = APInt::getSignBit(BitWidth);
-    APInt LHSKnownZero, LHSKnownOne, RHSKnownZero, RHSKnownOne;
+    APInt LHSKnownZero(BitWidth, 0);
+    APInt LHSKnownOne(BitWidth, 0);
     ComputeMaskedBits(LHS, Mask, LHSKnownZero, LHSKnownOne);
     bool LHSKnownNegative = LHSKnownOne[BitWidth - 1];
     bool LHSKnownPositive = LHSKnownZero[BitWidth - 1];
 
     if (LHSKnownNegative || LHSKnownPositive) {
+      APInt RHSKnownZero(BitWidth, 0);
+      APInt RHSKnownOne(BitWidth, 0);
       ComputeMaskedBits(RHS, Mask, RHSKnownZero, RHSKnownOne);
       bool RHSKnownNegative = RHSKnownOne[BitWidth - 1];
       bool RHSKnownPositive = RHSKnownZero[BitWidth - 1];