[all-commits] [llvm/llvm-project] 6a01b1: [AMDGPU] Fix caller/callee mismatch in SGPR assign...

[Shilei Tian via All-commits]

  Branch: refs/heads/users/shiltian/fix-inreg-argument-caller-callee-mismatch
  Home:   https://github.com/llvm/llvm-project
  Commit: 6a01b19ff3be0aea9707292bcd29951e57395ada
      https://github.com/llvm/llvm-project/commit/6a01b19ff3be0aea9707292bcd29951e57395ada
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2026-02-22 (Sun, 22 Feb 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-call.ll
    M llvm/test/CodeGen/AMDGPU/call-args-inreg-bfloat.ll
    M llvm/test/CodeGen/AMDGPU/call-args-inreg-no-sgpr-for-csrspill-xfail.ll
    M llvm/test/CodeGen/AMDGPU/call-args-inreg.ll
    M llvm/test/CodeGen/AMDGPU/cc-inreg-sgpr0-3-mismatch.ll
    M llvm/test/CodeGen/AMDGPU/function-args-inreg.ll
    M llvm/test/CodeGen/AMDGPU/tail-call-inreg-arguments.convergencetokens.ll
    M llvm/test/CodeGen/AMDGPU/tail-call-inreg-arguments.error.ll
    M llvm/test/CodeGen/AMDGPU/tail-call-inreg-arguments.ll

  Log Message:
  -----------
  [AMDGPU] Fix caller/callee mismatch in SGPR assignment for inreg args

On the callee side, `LowerFormalArguments` marks SGPR0-3 as allocated in
`CCState` before running the CC analysis. On the caller side, `LowerCall` (and
GlobalISel's `lowerCall`/`lowerTailCall`) added the scratch resource to
`RegsToPass` without marking it in `CCState`. This caused `CC_AMDGPU_Func` to
treat SGPR0-3 as available on the caller side, assigning user inreg args there,
while the callee skipped them without marking it in `CCState`. This caused
`CC_AMDGPU_Func` to treat SGPR0-3 as available on the caller side, assigning
user inreg args there, while the callee skipped them.



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