[all-commits] [llvm/llvm-project] a9d5bb: [RISCV] Use __extendhfsf2/__truncsfhf2 for fp16 <-...

[Kito Cheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a9d5bb926d45e9464d539226e380ae6accc95952
      https://github.com/llvm/llvm-project/commit/a9d5bb926d45e9464d539226e380ae6accc95952
  Author: Kito Cheng <kito.cheng at sifive.com>
  Date:   2022-01-29 (Sat, 29 Jan 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/calling-conv-half.ll
    M llvm/test/CodeGen/RISCV/copysign-casts.ll
    M llvm/test/CodeGen/RISCV/fp16-promote.ll
    M llvm/test/CodeGen/RISCV/fpclamptosat.ll
    M llvm/test/CodeGen/RISCV/fpclamptosat_vec.ll
    M llvm/test/CodeGen/RISCV/half-arith.ll
    M llvm/test/CodeGen/RISCV/half-convert.ll
    M llvm/test/CodeGen/RISCV/half-intrinsics.ll
    M llvm/test/CodeGen/RISCV/rv32i-rv64i-half.ll

  Log Message:
  -----------
  [RISCV] Use __extendhfsf2/__truncsfhf2 for fp16 <-> fp32

`__gnu_h2f_ieee` and `__gnu_f2h_ieee` are introduce by ARM and set that as
default name for fp16 and fp32 conversion in LLVM.

However RISC-V GCC using default naming scheme for that, which is
`__extendhfsf2` and `__truncsfhf2` for that, that cause runtime ABI
incompatible issue.

Although we didn't have formal runtime ABI spec to specify those naming
convention yet, but I think it would be great to fix the incompatible
issue first.

And I've plan to create a runtime ABI spec undere psABI spec this year.

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D118207