[all-commits] [llvm/llvm-project] 1cd28b: [AMDGPU] Have VCC as a first-class member of the S...

[Ivan Kosarev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1cd28beb77558f80644b4764a9402d0461345ae9
      https://github.com/llvm/llvm-project/commit/1cd28beb77558f80644b4764a9402d0461345ae9
  Author: Ivan Kosarev <ivan.kosarev at amd.com>
  Date:   2026-05-29 (Fri, 29 May 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
    M llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.td
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.1024bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.512bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.768bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.832bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.896bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.960bit.ll
    M llvm/test/CodeGen/AMDGPU/extend-phi-subrange-not-in-parent.mir
    M llvm/test/CodeGen/AMDGPU/ipra-regmask.ll
    M llvm/test/CodeGen/AMDGPU/load-constant-i1.ll
    M llvm/test/CodeGen/AMDGPU/preserve-wwm-copy-dst-reg.ll
    M llvm/test/CodeGen/AMDGPU/scc-clobbered-sgpr-to-vmem-spill.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-spill-to-vmem-scc-clobber-unhandled.mir
    M llvm/test/CodeGen/AMDGPU/spill-scavenge-offset.ll
    M llvm/test/CodeGen/AMDGPU/split-liverange-overlapping-copies.mir
    A llvm/test/MC/AMDGPU/vcc_tuples.s

  Log Message:
  -----------
  [AMDGPU] Have VCC as a first-class member of the SGPR pool. (#173870)

Add VCC and tuples using VCC to SGPR register classes.

We already support VCC as an allocatable register for 32-bit SGPR
operands, so it seems most natural to support it for register
tuple operands as well.

s106/s107 are still not allowed as aliases of vcc_lo/hi in
AsmParser.

The names given to the VCC tuples match those produced by SP3,
though it feels like there is room for improvement.

https://github.com/llvm/llvm-project/issues/62651



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