[all-commits] [llvm/llvm-project] 9458ba: [NVPTX] Custom lower integer<->bf16 conversions fo...

[Benjamin Kramer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9458bae553c82438e1817b4a5b1d003a8de064c3
      https://github.com/llvm/llvm-project/commit/9458bae553c82438e1817b4a5b1d003a8de064c3
  Author: Benjamin Kramer <benny.kra at googlemail.com>
  Date:   2023-12-11 (Mon, 11 Dec 2023)

  Changed paths:
    M llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
    M llvm/lib/Target/NVPTX/NVPTXISelLowering.h
    M llvm/test/CodeGen/NVPTX/bf16-instructions.ll

  Log Message:
  -----------
  [NVPTX] Custom lower integer<->bf16 conversions for sm_80 (#74827)

sm_80 only has f32->bf16 conversions, the remaining integer conversions
arrived with sm_90. Use a two-step conversion for sm_80.

There doesn't seem to be a way to express this promotion directly within
the legalization framework, so fallback on Custom lowering.