[all-commits] [llvm/llvm-project] f15b6b: [AArch64] Add target hook for preferPredicateOverE...

[david-arm via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f15b6b2907ef9da20a015be131fba9409db0670d
      https://github.com/llvm/llvm-project/commit/f15b6b2907ef9da20a015be131fba9409db0670d
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2022-07-21 (Thu, 21 Jul 2022)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfo.h
    M llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    M llvm/include/llvm/CodeGen/BasicTTIImpl.h
    M llvm/lib/Analysis/TargetTransformInfo.cpp
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.h
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    A llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding-option.ll

  Log Message:
  -----------
  [AArch64] Add target hook for preferPredicateOverEpilogue

This patch adds the AArch64 hook for preferPredicateOverEpilogue,
which currently returns true if SVE is enabled and one of the
following conditions (non-exhaustive) is met:

1. The "sve-tail-folding" option is set to "all", or
2. The "sve-tail-folding" option is set to "all+noreductions"
and the loop does not contain reductions,
3. The "sve-tail-folding" option is set to "all+norecurrences"
and the loop has no first-order recurrences.

Currently the default option is "disabled", but this will be
changed in a later patch.

I've added new tests to show the options behave as expected here:

  Transforms/LoopVectorize/AArch64/sve-tail-folding-option.ll

Differential Revision: https://reviews.llvm.org/D129560