[llvm] [SLP] Fix canConvertToFMA operand selection and fmul costing (PR #216425)

[Dmitry Sidorov via llvm-commits]

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@@ -14420,7 +14446,9 @@ static InstructionCost canConvertToFMA(ArrayRef<Value *> VL,
     ++NumOps;
     if (auto *FPCI = dyn_cast<FPMathOperator>(I))
       FMF &= FPCI->getFastMathFlags();
-    FMulPlusFAddCost += TTI.getInstructionCost(I, CostKind);
+    FMulPlusFAddCost += I->getOpcode() == Instruction::FMul
+                            ? GetUnfusedFMulCost(I)
+                            : TTI.getInstructionCost(I, CostKind);
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MrSidims wrote:

Yeah, totally forgot to update draft. Fixed, thanks!

https://github.com/llvm/llvm-project/pull/216425