[all-commits] [llvm/llvm-project] 5f7746: [GlobalIsel] Combine ADDO (#82927)

[Thorsten Schütt via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5f774619eac5db73398225a4c924a9c1d437fb40
      https://github.com/llvm/llvm-project/commit/5f774619eac5db73398225a4c924a9c1d437fb40
  Author: Thorsten Schütt <schuett at gmail.com>
  Date:   2024-03-14 (Thu, 14 Mar 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/CodeGen/GlobalISel/GenericMachineInstrs.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    A llvm/test/CodeGen/AArch64/GlobalISel/combine-overflow.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/prelegalizer-combiner-addo-zero.mir
    M llvm/test/CodeGen/AArch64/overflow.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/saddsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/srem.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ssubsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i64.ll

  Log Message:
  -----------
  [GlobalIsel] Combine ADDO (#82927)

Perform the requested arithmetic and produce a carry output in addition
to the normal result.

Clang has them as builtins (__builtin_add_overflow_p). The middle end
has intrinsics for them (sadd_with_overflow).

AArch64: ADDS Add and set flags

On Neoverse V2, they run at half the throughput of basic arithmetic and
have a limited set of pipelines.



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