[flang-commits] [flang] [flang] Make more [HL]FIR operations Pure. (PR #191309)

[Slava Zakharin via flang-commits]

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@@ -526,7 +526,7 @@ def fir_CharConvertOp : fir_Op<"char_convert", []> {
   let hasVerifier = 1;
 }
 
-def fir_UndefOp : fir_OneResultOp<"undefined", [NoMemoryEffect]> {
+def fir_UndefOp : fir_OneResultOp<"undefined", [Pure]> {
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vzakhari wrote:

Thank you for the idea, Tom. Yes, I also saw the `ConstantLike` trait on those LLVM operations and had the same concern as Jean. I think it is good to have it for completeness, if we can make it work :)

https://github.com/llvm/llvm-project/pull/191309