[all-commits] [llvm/llvm-project] b0f53d: [AArch64] Add SUBS(CSEL) fold from brcond. (#142103)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0f53d95c19e30428d549f589da864ccdd6d6952
      https://github.com/llvm/llvm-project/commit/b0f53d95c19e30428d549f589da864ccdd6d6952
  Author: David Green <david.green at arm.com>
  Date:   2025-06-06 (Fri, 06 Jun 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/Atomics/aarch64-atomicrmw-lsfe.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64-atomicrmw-v8a_fp.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-lse2.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-lse2_lse128.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-lsfe.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-outline_atomics.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-rcpc.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-rcpc3.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-v8_1a.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-v8a.ll
    M llvm/test/CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-v8a_fp.ll
    M llvm/test/CodeGen/AArch64/atomicrmw-O0.ll
    M llvm/test/CodeGen/AArch64/i128_with_overflow.ll

  Log Message:
  -----------
  [AArch64] Add SUBS(CSEL) fold from brcond. (#142103)

This folds away subs(csel(1, 0, cc)) from brcond, that can be produced
in certain places from compares that are not already subs (like adc/sbc
generated from i128 add_with_overflow intrinsics).



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