[all-commits] [llvm/llvm-project] 937cfd: [X86] combineGatherScatter - split non-constant (a...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 937cfdc7be56cb5cb46c098eecdb8e4f524add0d
      https://github.com/llvm/llvm-project/commit/937cfdc7be56cb5cb46c098eecdb8e4f524add0d
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-04-11 (Fri, 11 Apr 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/masked_gather_scatter.ll

  Log Message:
  -----------
  [X86] combineGatherScatter - split non-constant (add v, (splat b)) indices patterns and add the splat into the (scalar) base address (#135201)

We already did this for constant cases, this patch generalizes the existing fold to attempt to extract the splat from either operand of a ADD node for the gather/scatter index value

This cleanup should also make it easier to add support for splitting vXi32 indices on x86_64 64-bit pointer targets in the future as well.

Noticed while reviewing #134979



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