[llvm] [AMDGPU] Implement IR expansion for frem instruction (PR #130988)

[Matt Arsenault via llvm-commits]

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@@ -672,36 +1095,68 @@ static bool runImpl(Function &F, const TargetLowering &TLI) {
 
 namespace {
 class ExpandFpLegacyPass : public FunctionPass {
+  CodeGenOptLevel OptLevel;
+
 public:
   static char ID;
 
-  ExpandFpLegacyPass() : FunctionPass(ID) {
+  ExpandFpLegacyPass(CodeGenOptLevel OptLevel)
+      : FunctionPass(ID), OptLevel(OptLevel) {
     initializeExpandFpLegacyPassPass(*PassRegistry::getPassRegistry());
   }
 
+  ExpandFpLegacyPass() : ExpandFpLegacyPass(CodeGenOptLevel::None) {};
+
   bool runOnFunction(Function &F) override {
+    if (skipFunction(F))
+      return false;
+
     auto *TM = &getAnalysis<TargetPassConfig>().getTM<TargetMachine>();
     auto *TLI = TM->getSubtargetImpl(F)->getTargetLowering();
-    return runImpl(F, *TLI);
+    AssumptionCache *AC = nullptr;
+
+    if (OptLevel != CodeGenOptLevel::None || F.hasOptNone())
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arsenm wrote:

It is invalid to use skipFunction in mandatory lowering passes 

https://github.com/llvm/llvm-project/pull/130988