[llvm] [CodeGen] expand-fp: Change frem expansion criterion (PR #158285)

[Frederik Harwath via llvm-commits]

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@@ -587,7 +587,7 @@ SystemZTargetLowering::SystemZTargetLowering(const TargetMachine &TM,
       setOperationAction(ISD::FSIN, VT, Expand);
       setOperationAction(ISD::FCOS, VT, Expand);
       setOperationAction(ISD::FSINCOS, VT, Expand);
-      setOperationAction(ISD::FREM, VT, Expand);
+      setOperationAction(ISD::FREM, VT, LibCall);
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frederik-h wrote:

I agree that its strange to make an exception for FREM. I definitely felt an urge to add a comment explaining why it is being handled differently. I could try to unify the handling for all relevant instructions. Perhaps this could be left to a follow-up PR?

https://github.com/llvm/llvm-project/pull/158285