[all-commits] [llvm/llvm-project] 3c5cea: [AMDGPU]: Add implicit-def to the BB prolog (#112872)

[Christudasan Devadasan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3c5cea650dcef5e5aae8f4090f5b7f410b31fca2
      https://github.com/llvm/llvm-project/commit/3c5cea650dcef5e5aae8f4090f5b7f410b31fca2
  Author: Christudasan Devadasan <christudasan.devadasan at amd.com>
  Date:   2024-10-21 (Mon, 21 Oct 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/divergence-divergent-i1-used-outside-loop.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/image-waterfall-loop-O0.ll
    M llvm/test/CodeGen/AMDGPU/collapse-endcf.ll
    M llvm/test/CodeGen/AMDGPU/indirect-addressing-si.ll
    M llvm/test/CodeGen/AMDGPU/infloop-subrange-spill-inspect-subrange.mir
    M llvm/test/CodeGen/AMDGPU/infloop-subrange-spill.mir
    M llvm/test/CodeGen/AMDGPU/kernel-vgpr-spill-mubuf-with-voffset.ll
    M llvm/test/CodeGen/AMDGPU/merge-m0.mir

  Log Message:
  -----------
  [AMDGPU]: Add implicit-def to the BB prolog (#112872)

IMPLICIT_DEF inserted for a wwm-register at the
very first block or the predecessor block where
it is used for sgpr spilling can appear at a block
begin that requires spill-insertion during per-lane
VGPR regalloc phase. The presence of the IMPLICIT_DEF
currently breaks the BB prolog.

Fixes: SWDEV-490717



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