[PATCH] D117898: [Clang] Add elementwise saturated add/sub builtins

[Simon Pilgrim via Phabricator via cfe-commits]

RKSimon created this revision.
RKSimon added reviewers: fhahn, aaron.ballman, scanon, craig.topper.
Herald added subscribers: pengfei, sunfish, kristof.beyls, dschuff.
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This patch implements `__builtin_elementwise_add_sat` and `__builtin_elementwise_sub_sat' builtins

These map to the add/sub saturated math intrinsics described here:
https://llvm.org/docs/LangRef.html#saturation-arithmetic-intrinsics

With this in place we should then be able to replace the x86 SSE adds/subs intrinsics with these generic variants - it looks like other targets should be able to use these as well (arm/aarch64/webassembly all have similar examples in cgbuiltin).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117898

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/Builtins.def
  clang/lib/CodeGen/CGBuiltin.cpp
  clang/lib/Sema/SemaChecking.cpp
  clang/test/CodeGen/builtins-elementwise-math.c
  clang/test/Sema/builtins-elementwise-math.c
  clang/test/SemaCXX/builtins-elementwise-math.cpp

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