[all-commits] [llvm/llvm-project] 4981f8: [PowerPC] Fix vector_shuffle combines when inputs ...

[Amy Kwan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4981f8cb72ea7d04da601c868763b38bdc11e74e
      https://github.com/llvm/llvm-project/commit/4981f8cb72ea7d04da601c868763b38bdc11e74e
  Author: Amy Kwan <amy.kwan1 at ibm.com>
  Date:   2024-11-11 (Mon, 11 Nov 2024)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/test/CodeGen/PowerPC/p8-scalar_vector_conversions.ll
    M llvm/test/CodeGen/PowerPC/v16i8_scalar_to_vector_shuffle.ll
    M llvm/test/CodeGen/PowerPC/v2i64_scalar_to_vector_shuffle.ll
    M llvm/test/CodeGen/PowerPC/v4i32_scalar_to_vector_shuffle.ll
    M llvm/test/CodeGen/PowerPC/v8i16_scalar_to_vector_shuffle.ll

  Log Message:
  -----------
  [PowerPC] Fix vector_shuffle combines when inputs are scalar_to_vector of differing types. (#80784)

This patch fixes the combines for vector_shuffles when either or both of
its left and right hand side inputs are scalar_to_vector nodes.

Previously, when both left and right side inputs are scalar_to_vector
nodes, the current combine could not handle this situation, as the shuffle
mask was updated incorrectly. To temporarily solve this solution, this combine
was simply disabled and not performed.

Now, not only does this patch aim to resolve the previous issue of the
incorrect shuffle mask adjustments respectively, but it also updates any test
cases that are affected by this change.

Patch migrated from https://reviews.llvm.org/D130487.



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