[all-commits] [llvm/llvm-project] 337a4d: [NVPTX] Use sink registers instead of temp registe...

[Justin Lebar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 337a4d5526618c7c16f20967f7bd10d1cf27c6c4
      https://github.com/llvm/llvm-project/commit/337a4d5526618c7c16f20967f7bd10d1cf27c6c4
  Author: Justin Lebar <justin.lebar at gmail.com>
  Date:   2025-04-10 (Thu, 10 Apr 2025)

  Changed paths:
    M llvm/lib/Target/NVPTX/NVPTXInstrInfo.td
    M llvm/test/CodeGen/NVPTX/bf16-instructions.ll
    M llvm/test/CodeGen/NVPTX/bf16x2-instructions.ll
    M llvm/test/CodeGen/NVPTX/bswap.ll
    M llvm/test/CodeGen/NVPTX/i16x2-instructions.ll
    M llvm/test/CodeGen/NVPTX/i8x4-instructions.ll

  Log Message:
  -----------
  [NVPTX] Use sink registers instead of temp registers where possible. (#134957)

PTX 7.1 introduces the concept of a "sink" register, `_`, which is a
register to which writes are ignored.

This patch makes us use sink registers where possible, instead of using
explicit temp registers.

This results in cleaner assembly, and also works around a problem we
encountered in some private workloads.

(Unfortunately the tablegen is not particularly clean. But then again,
it's tablegen...)



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