[llvm] [ConstantFold] Fold `erf` and `erff` when the input parameter is a constant value. (PR #113079)

[Matt Arsenault via llvm-commits]

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@@ -3624,6 +3628,10 @@ bool llvm::isMathLibCallNoop(const CallBase *Call,
       case LibFunc_sqrtf:
         return Op.isNaN() || Op.isZero() || !Op.isNegative();
 
+      case LibFunc_erf:
+      case LibFunc_erff:
+        return true;
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arsenm wrote:

You would have to enable strictfp support (which barely works in llvm), or avoid calling the host function in any of the edge cases that you are relying on the exception 

https://github.com/llvm/llvm-project/pull/113079