[PATCH] D152892: [AMDGPU] Remove return VGPRs from callee save list

[Christudasan Devadasan via Phabricator via llvm-commits]

cdevadas added inline comments.


================
Comment at: llvm/lib/Target/AMDGPU/SIFrameLowering.cpp:1521
         MFI->allocateWWMSpill(MF, MI.getOperand(1).getReg());
+      else if (MI.getOpcode() == AMDGPU::SI_RETURN ||
+               MI.getOpcode() == AMDGPU::SI_RETURN_TO_EPILOG) {
----------------
I assume this is only a short-term fix until revising the gfx ABI to move return VGPRs into the scratch regs range to avoid the CSR spills/restores.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D152892/new/

https://reviews.llvm.org/D152892