[all-commits] [llvm/llvm-project] aa5158: [AMDGPU] Use absolute relocations when compiling f...

[Thomas Symalla via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aa5158cd1ee01625fbbe6fb106b0f2598b0fdf72
      https://github.com/llvm/llvm-project/commit/aa5158cd1ee01625fbbe6fb106b0f2598b0fdf72
  Author: Thomas Symalla <5754458+tsymalla at users.noreply.github.com>
  Date:   2023-10-10 (Tue, 10 Oct 2023)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.h
    M llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/global-value.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-reloc-const.ll
    M llvm/test/CodeGen/AMDGPU/ds_read2.ll
    M llvm/test/CodeGen/AMDGPU/gfx-call-non-gfx-func.ll
    M llvm/test/CodeGen/AMDGPU/gfx-callable-argument-types.ll
    M llvm/test/CodeGen/AMDGPU/gfx-callable-preserved-registers.ll
    M llvm/test/CodeGen/AMDGPU/gfx-callable-return-types.ll
    M llvm/test/CodeGen/AMDGPU/global-constant.ll
    M llvm/test/CodeGen/AMDGPU/lds-relocs.ll
    M llvm/test/CodeGen/AMDGPU/lower-work-group-id-intrinsics.ll
    M llvm/test/CodeGen/AMDGPU/stacksave_stackrestore.ll
    M llvm/test/CodeGen/AMDGPU/tail-call-amdgpu-gfx.ll
    M llvm/test/MC/AMDGPU/elf-lds.s

  Log Message:
  -----------
  [AMDGPU] Use absolute relocations when compiling for AMDPAL and Mesa3D (#67791)

The primary ISA-independent justification for using PC-relative
addressing is that it makes code position-independent and therefore
allows sharing of .text pages between processes.

When not sharing .text pages, we can use absolute relocations instead,
which will possibly prevent a bubble introduced by s_getpc_b64.

Co-authored-by: Thomas Symalla <thomas.symalla at amd.com>