Florian Hahn 54b33eba16 [VPlan] Add opcode to create step for wide inductions. (#119284) ...

This patch adds a WideIVStep opcode that can be used to create a vector
with the steps to increment a wide induction. The opcode has 2 operands
* the vector step
* the scale of the vector step

The opcode is later converted into a sequence of recipes that convert
the scale and step to the target type, if needed, and then multiply
vector step by scale.

This simplifies code that needs to materialize step vectors, e.g.
replacing wide IVs as follow up to
https://github.com/llvm/llvm-project/pull/108378 with an increment of
the wide IV step.

PR: https://github.com/llvm/llvm-project/pull/119284

2025-04-14 23:20:44 +02:00

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