[llvm] [VPlan] Compute cost of some VPWidenIntOrFpInductions in VPlan (PR #202232)

[David Sherwood via llvm-commits]

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@@ -2850,6 +2850,26 @@ bool VPWidenIntOrFpInductionRecipe::isCanonical() const {
          getScalarType() == getRegion()->getCanonicalIVType();
 }
 
+InstructionCost
+VPWidenIntOrFpInductionRecipe::computeCost(ElementCount VF,
+                                           VPCostContext &Ctx) const {
+  // A widened induction generates a vector phi and increments it by the
+  // splatted step each iteration.
+  // TODO: Also handle truncated inductions.
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david-arm wrote:

Might this now be possible after VPInstructionWithType::computeCost function is filled in?

https://github.com/llvm/llvm-project/pull/202232