[all-commits] [llvm/llvm-project] bca744: [AMDGPU] Lower uniform uaddsat.i16 to SALU instruc...

[Anshil Gandhi via All-commits]

  Branch: refs/heads/users/gandhi56/amdgpu-isel/uaddsat-i16-gcnpat
  Home:   https://github.com/llvm/llvm-project
  Commit: bca744caf6189a47e04fca4b93e3d84a6bdbd67e
      https://github.com/llvm/llvm-project/commit/bca744caf6189a47e04fca4b93e3d84a6bdbd67e
  Author: Anshil Gandhi <Anshil.Gandhi at amd.com>
  Date:   2026-07-27 (Mon, 27 Jul 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/uaddsat.ll

  Log Message:
  -----------
  [AMDGPU] Lower uniform uaddsat.i16 to SALU instructions

Promote uniform i16 uadd.sat to i32 in promoteUniformOpToI32 so it
lowers to SALU (s_add_i32 + s_min_u32) instead of VALU + readfirstlane.
The saturating add on zero-extended operands reduces to
umin(add(lhs, rhs), 0xffff).

Co-authored-by: Cursor <cursoragent at cursor.com>



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