[all-commits] [llvm/llvm-project] 09c412: [AMDGPU] Fix restores in chain functions (#116193)

[Diana Picus via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 09c41246ed58344892a1a82f7256a4ad6e1c49d7
      https://github.com/llvm/llvm-project/commit/09c41246ed58344892a1a82f7256a4ad6e1c49d7
  Author: Diana Picus <Diana-Magda.Picus at amd.com>
  Date:   2024-11-20 (Wed, 20 Nov 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
    M llvm/test/CodeGen/AMDGPU/pei-amdgpu-cs-chain-preserve.mir
    M llvm/test/CodeGen/AMDGPU/pei-amdgpu-cs-chain.mir

  Log Message:
  -----------
  [AMDGPU] Fix restores in chain functions (#116193)

When spilling a VGPR in `emitPrologue`, chain functions prefer to use
offsets to access the stack instead of the SP.

This patch fixes `emitEpilogue` to do the same. It also brings back some
test coverage that was lost in #93526, when WWM registers started being
shifted to the lowest available range (which meant that tests that were
originally spilling v8 would shift to spill v0, which is a scratch
register for chain functions and didn't get spilled).

Change-Id: Icb07fccd859b563cd45f74c25ae578ecb38bdeeb



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