[PATCH] D124813: [HLSL] Add clang builtin for HLSL.

[Xiang Li via Phabricator via cfe-commits]

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Two directx specific clang builtins are introduced:

unsigned __builtin_dx_umax_i3232(unsigned, unsigned);
unsigned __builtin_dx_umin_i3232(unsigned, unsigned);

They're for https://github.com/Microsoft/DirectXShaderCompiler/blob/master/docs/DXIL.rst#umax and
https://github.com/Microsoft/DirectXShaderCompiler/blob/master/docs/DXIL.rst#umini.

These 2 builtins are translated into llvm umax/umin intrinsic in clang codeGen.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D124813

Files:
  clang/include/clang/Basic/BuiltinsDirectX.def
  clang/include/clang/Basic/TargetBuiltins.h
  clang/lib/Basic/Targets/DirectX.cpp
  clang/lib/Basic/Targets/DirectX.h
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/lib/CodeGen/CodeGenFunction.h
  clang/test/CodeGenHLSL/umax_umin.hlsl

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