Florian Hahn aa24029319 [VPlan] Unroll VPReplicateRecipe by VF. (#142433) ...

Explicitly unroll VPReplicateRecipes outside replicate regions by VF,
replacing them by VF single-scalar recipes. Extracts for operands are
added as needed and the scalar results are combined to a vector using a
new BuildVector VPInstruction.

It also adds a few folds to simplify unnecessary extracts/BuildVectors.

It also adds a BuildStructVector opcode for handling of calls that have
struct return types.

VPReplicateRecipe in replicate regions can will be unrolled as follow
up, turing non-single-scalar VPReplicateRecipes into 'abstract', i.e.
not executable.

PR: https://github.com/llvm/llvm-project/pull/142433

2025-06-26 11:19:09 +01:00

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