[llvm] [ValueTracking] Add support for `trunc nuw/nsw` in isKnowNonZero (PR #89643)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 23 04:51:05 PDT 2024
================
@@ -2632,6 +2632,13 @@ static bool isKnownNonZeroFromOperator(const Operator *I,
Q.DL.getTypeSizeInBits(I->getType()).getFixedValue())
return isKnownNonZero(I->getOperand(0), Q, Depth);
break;
+ case Instruction::Trunc: {
+ auto *TI = cast<TruncInst>(I);
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nikic wrote:
This probably needs to be dyn_cast, as trunc can occur in constant expressions.
https://github.com/llvm/llvm-project/pull/89643
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