[llvm] [SLP] Make getSameOpcode support interchangeable instructions. (PR #127450)

[Alexey Bataev via llvm-commits]

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@@ -1085,6 +1294,29 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
     return InstructionsState::invalid();
   }
 
+  if (IsBinOp) {
+    auto FindOp =
+        [&](ArrayRef<std::unique_ptr<InterchangeableInstruction>> Candidate) {
+          for (const std::unique_ptr<InterchangeableInstruction> &I :
+               Candidate) {
+            unsigned InterchangeableInstructionOpcode =
+                I->getInterchangeableInstructionOpcode();
+            for (Value *V : VL) {
+              if (isa<PoisonValue>(V))
+                continue;
+              if (cast<Instruction>(V)->getOpcode() ==
+                  InterchangeableInstructionOpcode)
+                return cast<Instruction>(V);
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alexey-bataev wrote:

Avoid double cast

https://github.com/llvm/llvm-project/pull/127450