[all-commits] [llvm/llvm-project] aa5ff6: [HLSL] Shore up floating point conversions (#90222)

[Chris B via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aa5ff68247ddd763c4f5de78ab8ee5739b6f401b
      https://github.com/llvm/llvm-project/commit/aa5ff68247ddd763c4f5de78ab8ee5739b6f401b
  Author: Chris B <chris.bieneman at me.com>
  Date:   2024-05-02 (Thu, 02 May 2024)

  Changed paths:
    M clang/lib/Sema/SemaOverload.cpp
    M clang/test/SemaHLSL/OverloadResolutionBugs.hlsl
    A clang/test/SemaHLSL/ScalarOverloadResolution.hlsl
    A clang/test/SemaHLSL/VectorElementOverloadResolution.hlsl

  Log Message:
  -----------
  [HLSL] Shore up floating point conversions (#90222)

This PR fixes bugs in HLSL floating conversions. HLSL always has `half`,
`float` and `double` types, which promote in the order:

`half`->`float`->`double`

and convert in the order:

`double`->`float`->`half`

As with other conversions in C++, promotions are preferred over
conversions.

We do have floating conversions documented in the draft language
specification (https://microsoft.github.io/hlsl-specs/specs/hlsl.pdf
[Conv.rank.float]) although the exact language is still in flux
(https://github.com/microsoft/hlsl-specs/pull/206).

Resolves #81047



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