================
@@ -1140,6 +1148,15 @@ void PromoteMem2Reg::RenamePass(BasicBlock *BB,
BasicBlock *Pred,
if (isa<FPMathOperator>(APN) && NoSignedZeros)
APN->setHasNoSignedZeros(true);
+ // This allows select instruction folding relevant to floating point
+ // reductions whose operand is a PHI.
+ if (isa<FPMathOperator>(APN) && NoNaNs)
+ APN->setHasNoNaNs(true);
+
+ // Handle NoInfs flag too.
+ if (isa<FPMathOperator>(APN) && NoInfs)
+ APN->setHasNoInfs(true);
----------------
nikic wrote:
I'd suggest to extract a common `if (isa<FPMathOperator>(APN))` around all
three.
https://github.com/llvm/llvm-project/pull/114271
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