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| author | Shilei Tian <i@tianshilei.me> | 2025-03-08 06:28:20 -0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-03-08 09:28:20 -0500 |
| commit | a779af3f882e1500ee6b9cb973e60c10ea0819b4 (patch) | |
| tree | c3f4b7cfd0378a308a1591a7ba235d27902be831 /llvm/lib | |
| parent | e86c5a7b9dbff5383cf9c81aa9eff38a92ce73aa (diff) | |
| download | llvm-a779af3f882e1500ee6b9cb973e60c10ea0819b4.zip llvm-a779af3f882e1500ee6b9cb973e60c10ea0819b4.tar.gz llvm-a779af3f882e1500ee6b9cb973e60c10ea0819b4.tar.bz2 | |
[AMDGPU] Change SGPR layout to striped caller/callee saved (#127353)
This PR updates the SGPR layout to a striped caller/callee-saved design,
similar
to the VGPR layout.
To ensure that s30-s31 (return address), s32 (stack pointer), s33 (frame
pointer), and s34 (base pointer) remain callee-saved, the striped layout
starts
from s40, with a stripe width of 8. The last stripe is 10 wide instead
of 8 to
avoid ending with a 2-wide stripe.
Fixes #113782.
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td b/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td index 80969fc..e891fdb 100644 --- a/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td +++ b/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td @@ -91,7 +91,15 @@ def CSR_AMDGPU_AGPRs : CalleeSavedRegs< >; def CSR_AMDGPU_SGPRs : CalleeSavedRegs< - (sequence "SGPR%u", 30, 105) + // Ensure that s30-s31 (return address), s32 (stack pointer), s33 (frame pointer), + // and s34 (base pointer) are callee-saved. The striped layout starts from s40, + // with a stripe width of 8. The last stripe is 10 wide instead of 8, to avoid + // ending with a 2-wide stripe. + (add (sequence "SGPR%u", 30, 39), + (sequence "SGPR%u", 48, 55), + (sequence "SGPR%u", 64, 71), + (sequence "SGPR%u", 80, 87), + (sequence "SGPR%u", 96, 105)) >; def CSR_AMDGPU_SI_Gfx_SGPRs : CalleeSavedRegs< |