[all-commits] [llvm/llvm-project] bb5f53: [DAG] isSplatValue - only treat binop splats with ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bb5f53c727419c90e3ad6ca7db49330c64a8f54c
      https://github.com/llvm/llvm-project/commit/bb5f53c727419c90e3ad6ca7db49330c64a8f54c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-04-16 (Wed, 16 Apr 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-buildvec-of-binop.ll
    M llvm/test/CodeGen/X86/pr134602.ll
    M llvm/test/CodeGen/X86/pr135917.ll
    M llvm/test/CodeGen/X86/vector-fshl-rot-sub128.ll
    M llvm/test/CodeGen/X86/vector-fshl-sub128.ll
    M llvm/test/CodeGen/X86/vector-fshr-rot-sub128.ll
    M llvm/test/CodeGen/X86/vector-fshr-sub128.ll

  Log Message:
  -----------
  [DAG] isSplatValue - only treat binop splats with repeated undef elements as undef (#135945)

#135597 didn't correctly fix the issue of binops with an undef element
from only one operand - only reporting the common undef elements could
incorrectly recognise splats where the (binop X, undef) fold might
actually be different - we need to ensure both operands have the same
demanded undefs for certainty.

Fixes #135917



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