Avoid to assert on "(KnownZero & KnownOne) == 0".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35062 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index abb279f7740e592e5db9ce12857382248470d228..62a7a8dea4d1e372b4d51b397ebf55bb3215b59c 100644 (file)
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -979,7 +979,7 @@ static bool MaskedValueIsZero(Value *V, uint64_t Mask, unsigned Depth = 0) {
 /// this predicate to simplify operations downstream.  Mask is known to be zero
 /// for bits that V cannot have.
 static bool MaskedValueIsZero(Value *V, const APInt& Mask, unsigned Depth = 0) {
-  APInt KnownZero(Mask), KnownOne(Mask);
+  APInt KnownZero(Mask.getBitWidth(), 0), KnownOne(Mask.getBitWidth(), 0);
   ComputeMaskedBits(V, Mask, KnownZero, KnownOne, Depth);
   assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 
   return (KnownZero & Mask) == Mask;