[llvm] [SimplifyLibCalls] Constant fold `remquo` (PR #99647)

[Yingwei Zheng via llvm-commits]

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@@ -3018,6 +3018,39 @@ void LibCallSimplifier::classifyArgUse(
   }
 }
 
+/// Constant folds remquo
+Value *LibCallSimplifier::optimizeRemquo(CallInst *CI, IRBuilderBase &B) {
+  const APFloat *X, *Y;
+  if (!match(CI->getArgOperand(0), m_APFloat(X)) ||
+      !match(CI->getArgOperand(1), m_APFloat(Y)))
+    return nullptr;
+
+  if (X->isNaN() || Y->isNaN() || X->isInfinity() || Y->isZero())
+    return nullptr;
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dtcxzyw wrote:

It is guarded in
https://github.com/llvm/llvm-project/blob/e64e745e8fb802ffb06259b1a5ba3db713a17087/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp#L3819-L3826


https://github.com/llvm/llvm-project/pull/99647