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ValueTracking: Small cleanup in ComputeNumSignBits 

Constant contains the isAllOnesValue and isNullValue predicates, not
ConstantInt.

llvm-svn: 224848
This commit is contained in:
David Majnemer 2014-12-26 09:20:17 +00:00
parent 54c2ca2539
commit a55027f68a
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/Analysis/ValueTracking.cpp
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@ -1768,7 +1768,7 @@ unsigned ComputeNumSignBits(Value *V, const DataLayout *TD,
if (Tmp == 1) return 1; // Early out. if (Tmp == 1) return 1; // Early out.
// Special case decrementing a value (ADD X, -1): // Special case decrementing a value (ADD X, -1):
if (ConstantInt *CRHS = dyn_cast<ConstantInt>(U->getOperand(1))) if (const auto *CRHS = dyn_cast<Constant>(U->getOperand(1)))
if (CRHS->isAllOnesValue()) { if (CRHS->isAllOnesValue()) {
APInt KnownZero(TyBits, 0), KnownOne(TyBits, 0); APInt KnownZero(TyBits, 0), KnownOne(TyBits, 0);
computeKnownBits(U->getOperand(0), KnownZero, KnownOne, TD, Depth+1, Q); computeKnownBits(U->getOperand(0), KnownZero, KnownOne, TD, Depth+1, Q);
@ -1793,7 +1793,7 @@ unsigned ComputeNumSignBits(Value *V, const DataLayout *TD,
if (Tmp2 == 1) return 1; if (Tmp2 == 1) return 1;
// Handle NEG. // Handle NEG.
if (ConstantInt *CLHS = dyn_cast<ConstantInt>(U->getOperand(0))) if (const auto *CLHS = dyn_cast<Constant>(U->getOperand(0)))
if (CLHS->isNullValue()) { if (CLHS->isNullValue()) {
APInt KnownZero(TyBits, 0), KnownOne(TyBits, 0); APInt KnownZero(TyBits, 0), KnownOne(TyBits, 0);
computeKnownBits(U->getOperand(1), KnownZero, KnownOne, TD, Depth+1, Q); computeKnownBits(U->getOperand(1), KnownZero, KnownOne, TD, Depth+1, Q);