[all-commits] [llvm/llvm-project] 4f12f4: [AArch64] Switch to soft promoting half types. (#8...

[Harald van Dijk via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4f12f47550eee85447c9ec37d27a20c6593d3d40
      https://github.com/llvm/llvm-project/commit/4f12f47550eee85447c9ec37d27a20c6593d3d40
  Author: Harald van Dijk <harald at gigawatt.nl>
  Date:   2024-02-22 (Thu, 22 Feb 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/test/CodeGen/AArch64/strictfp_f16_abi_promote.ll

  Log Message:
  -----------
  [AArch64] Switch to soft promoting half types. (#80576)

The traditional promotion is known to generate wrong code.

Like #80440 for ARM, except that far less is affected as on AArch64,
hardware floating point support always includes FP16 support and is
unaffected by these changes. This only affects `-mgeneral-regs-only`
(Clang) / `-mattr=-fp-armv8` (LLVM).

Because this only affects a configuration where no FP support is
available at all, `useFPRegsForHalfType()` has no effect and is not
specified: `f32` was getting legalized as a parameter and return type to
an integer anyway.



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