[all-commits] [llvm/llvm-project] a6eedc: AMDGPU: Mark the return address def of SI_CALL dead

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/amdgpu/si-call-dead-return-address
  Home:   https://github.com/llvm/llvm-project
  Commit: a6eedcc6735cb0600571957740d11b5f2373c20a
      https://github.com/llvm/llvm-project/commit/a6eedcc6735cb0600571957740d11b5f2373c20a
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/dereferenceable-declaration.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/dropped_debug_info_assert.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-assert-align.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-abi-attribute-hints.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-implicit-args.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-non-fixed.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-return-values.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call-sret.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-indirect-call.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-sibling-call.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-call.ll
    M llvm/test/CodeGen/AMDGPU/call-c-function.ll
    M llvm/test/CodeGen/AMDGPU/call-defs-mode-register.ll
    M llvm/test/CodeGen/AMDGPU/irtranslator-whole-wave-functions.ll
    M llvm/test/CodeGen/AMDGPU/isel-amdgpu-cs-chain-cc.ll
    M llvm/test/CodeGen/AMDGPU/isel-whole-wave-functions.ll
    M llvm/test/CodeGen/AMDGPU/mmra.ll

  Log Message:
  -----------
  AMDGPU: Mark the return address def of SI_CALL dead

The call writes the return address but nothing in the local function reads
the new value. Avoid needing to recover the dead flag later.

Co-authored-by: Claude Opus 5 <noreply at anthropic.com>



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