llvm-project

1484f82c - [VPlan] Add VPInstruction::StepVector and use it in VPWidenIntOrFpInductionRecipe (#129508)

[VPlan] Add VPInstruction::StepVector and use it in VPWidenIntOrFpInductionRecipe (#129508) Split off from #118638, this adds VPInstruction::StepVector, which generates integer step vectors (0,1,2,...,VF). This is a step towards eventually modelling all the separate parts of VPWidenIntOrFpInductionRecipe in VPlan. This is then used by VPWidenIntOrFpInductionRecipe, where we materialize it just before unrolling so the operands stay in a fixed position. The need for a separate operand in VPWidenIntOrFpInductionRecipe, as well as the need to update it in optimizeVectorInductionWidthForTCAndVFUF, should be removed with #118638 when everything is expanded in convertToConcreteRecipes.