[all-commits] [llvm/llvm-project] 0a0fcc: [HLSL] Implement floating literal suffixes (#87270)

[Chris B via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0a0fccfc6c0519402a2566e1f63440410e524d17
      https://github.com/llvm/llvm-project/commit/0a0fccfc6c0519402a2566e1f63440410e524d17
  Author: Chris B <chris.bieneman at me.com>
  Date:   2024-04-05 (Fri, 05 Apr 2024)

  Changed paths:
    M clang/lib/Sema/SemaExpr.cpp
    A clang/test/SemaHLSL/literal_suffixes.hlsl
    A clang/test/SemaHLSL/literal_suffixes_no_16bit.hlsl

  Log Message:
  -----------
  [HLSL] Implement floating literal suffixes (#87270)

This change implements the HLSL floating literal suffixes for half and
double literals. The PR for the HLSL language specification for this
behavior is https://github.com/microsoft/hlsl-specs/pull/175.

The TL;DR is that the `h` suffix on floating literals means `half`, and
the `l` suffix means `double`.

The expected behavior and diagnostics are different if native half is
supported. When native half is not enabled half is 32-bit so implicit
conversions to float do not lose precision and do not warn.

In all cases `half` and `float` are distinct types.

Resolves #85712



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