[llvm] [VPlan] Compute cost for most opcodes in VPWidenRecipe (NFCI). (PR #98764)

[via llvm-commits]

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@@ -1140,6 +1140,80 @@ void VPWidenRecipe::execute(VPTransformState &State) {
 #endif
 }
 
+InstructionCost VPWidenRecipe::computeCost(ElementCount VF,
+                                           VPCostContext &Ctx) const {
+  TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput;
+  switch (Opcode) {
+  case Instruction::FNeg: {
+    Type *VectorTy =
+        ToVectorTy(Ctx.Types.inferScalarType(this->getVPSingleValue()), VF);
+    return Ctx.TTI.getArithmeticInstrCost(
+        Opcode, VectorTy, CostKind,
+        {TargetTransformInfo::OK_AnyValue, TargetTransformInfo::OP_None},
+        {TargetTransformInfo::OK_AnyValue, TargetTransformInfo::OP_None});
+  }
+
+  case Instruction::UDiv:
+  case Instruction::SDiv:
+  case Instruction::SRem:
+  case Instruction::URem:
+    // More complex computation, let the legacy cost-model handle this for now.
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ayalz wrote:

"// TODO: ..."

https://github.com/llvm/llvm-project/pull/98764