[ValueTracking] Replace all uses of ComputeSignBit with computeKnownBits.
This patch finishes off the conversion of ComputeSignBit to computeKnownBits.
Differential Revision: https://reviews.llvm.org/D33166
llvm-svn: 303035
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 9de053f..8613d3c 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -6661,13 +6661,12 @@
// {K,ashr,<positive-constant>} stabilizes to signum(K) in at most
// bitwidth(K) iterations.
Value *FirstValue = PN->getIncomingValueForBlock(Predecessor);
- bool KnownZero, KnownOne;
- ComputeSignBit(FirstValue, KnownZero, KnownOne, DL, 0, nullptr,
- Predecessor->getTerminator(), &DT);
+ KnownBits Known = computeKnownBits(FirstValue, DL, 0, nullptr,
+ Predecessor->getTerminator(), &DT);
auto *Ty = cast<IntegerType>(RHS->getType());
- if (KnownZero)
+ if (Known.isNonNegative())
StableValue = ConstantInt::get(Ty, 0);
- else if (KnownOne)
+ else if (Known.isNegative())
StableValue = ConstantInt::get(Ty, -1, true);
else
return getCouldNotCompute();