[all-commits] [llvm/llvm-project] 061e36: [SelectionDAG] Implement soft FP legalisation for ...

[Alex Bradbury via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 061e368fe213bd0701261a3e59f796c7439484fc
      https://github.com/llvm/llvm-project/commit/061e368fe213bd0701261a3e59f796c7439484fc
  Author: Alex Bradbury <asb at igalia.com>
  Date:   2023-05-29 (Mon, 29 May 2023)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
    A llvm/test/CodeGen/RISCV/bfloat.ll

  Log Message:
  -----------
  [SelectionDAG] Implement soft FP legalisation for bf16 FP_EXTEND and BF16_TO_FP

As discussed in D151436, it's safe to do this as a simple shift (as is
done in LegalizeDAG.cpp) rather than needing a libcall. The added test
cases for RISC-V previously just triggered an assertion.

Codegen for bfloat_to_double will be slightly improved by D151434.

Differential Revision: https://reviews.llvm.org/D151563