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[ValueTracking][NFC] Use Log2(Align) instead of countTrailingZeroes

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The latter can probably be optimized to the same final code, but this might
help -O0 builds.
This commit is contained in:
Alex Richardson 2020-10-27 09:56:19 +00:00
parent 58c20890b0
commit ab6e2d9347
1 changed files with 1 additions and 1 deletions
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lib/Analysis/ValueTracking.cpp
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@ -2003,7 +2003,7 @@ void computeKnownBits(const Value *V, const APInt &DemandedElts,
// Aligned pointers have trailing zeros - refine Known.Zero set
if (isa<PointerType>(V->getType())) {
Align Alignment = V->getPointerAlignment(Q.DL);
Known.Zero.setLowBits(countTrailingZeros(Alignment.value()));
Known.Zero.setLowBits(Log2(Alignment));
}
// computeKnownBitsFromAssume strictly refines Known.