[all-commits] [llvm/llvm-project] c4e772: [Thumb2] Add regression test from #92576

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c4e77280f00370bb942098c13902f04c89033784
      https://github.com/llvm/llvm-project/commit/c4e77280f00370bb942098c13902f04c89033784
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-08 (Thu, 08 Aug 2024)

  Changed paths:
    A llvm/test/CodeGen/Thumb2/abds-crash.ll

  Log Message:
  -----------
  [Thumb2] Add regression test from #92576

Ensure abds doesn't get truncated after type legalisation


  Commit: 13d04fa560e156797c21f16b05e950649bfb9dff
      https://github.com/llvm/llvm-project/commit/13d04fa560e156797c21f16b05e950649bfb9dff
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-08-08 (Thu, 08 Aug 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/AArch64/abds-neg.ll
    M llvm/test/CodeGen/AArch64/abds.ll
    M llvm/test/CodeGen/AArch64/abdu-neg.ll
    M llvm/test/CodeGen/AArch64/abdu.ll
    M llvm/test/CodeGen/AArch64/arm64-vabs.ll
    M llvm/test/CodeGen/AArch64/neon-abd.ll
    M llvm/test/CodeGen/AArch64/sve-aba.ll
    M llvm/test/CodeGen/AArch64/sve-abd.ll
    M llvm/test/CodeGen/AMDGPU/sad.ll
    M llvm/test/CodeGen/ARM/neon_vabd.ll
    M llvm/test/CodeGen/PowerPC/ppc64-P9-vabsd.ll
    M llvm/test/CodeGen/PowerPC/vec-zext-abdu.ll
    M llvm/test/CodeGen/RISCV/abds-neg.ll
    M llvm/test/CodeGen/RISCV/abds.ll
    M llvm/test/CodeGen/RISCV/abdu-neg.ll
    M llvm/test/CodeGen/RISCV/abdu.ll
    M llvm/test/CodeGen/RISCV/rvv/abd.ll
    M llvm/test/CodeGen/Thumb2/abds-crash.ll
    M llvm/test/CodeGen/Thumb2/mve-vabdus.ll
    M llvm/test/CodeGen/X86/abds-neg.ll
    M llvm/test/CodeGen/X86/abds.ll
    M llvm/test/CodeGen/X86/abdu-neg.ll
    M llvm/test/CodeGen/X86/abdu.ll

  Log Message:
  -----------
  [DAG] Add legalization handling for ABDS/ABDU (#92576) (REAPPLIED)

Always match ABD patterns pre-legalization, and use TargetLowering::expandABD to expand again during legalization.

abdu(lhs, rhs) -> sub(xor(sub(lhs, rhs), usub_overflow(lhs, rhs)), usub_overflow(lhs, rhs))
Alive2: https://alive2.llvm.org/ce/z/dVdMyv

REAPPLIED: Fix regression issue with "abs(ext(x) - ext(y)) -> zext(abd(x, y))" fold failing after type legalization


Compare: https://github.com/llvm/llvm-project/compare/719557269e9f...13d04fa560e1

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