[llvm] [SimplifyLibCalls] Move constant folding logic in `ConstantFoldLibCall2` (PR #172139)

[Yingwei Zheng via llvm-commits]

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@@ -3391,6 +3392,20 @@ static Constant *ConstantFoldLibCall2(StringRef Name, Type *Ty,
     if (TLI->has(Func))
       return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
     break;
+  case LibFunc_fdim:
+  case LibFunc_fdimf:
+  case LibFunc_fdiml:
+    if (TLI->has(Func)) {
+        // C99 fdim(x, y) = (x > y) ? x - y : +0.
+      if (!Op1V.isNaN() && !Op2V.isNaN() &&
+          Op1V.compare(Op2V) != APFloat::cmpGreaterThan){
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dtcxzyw wrote:

Drop braces.


https://github.com/llvm/llvm-project/pull/172139