[PATCH] D143287: [Clang][x86] Change x86 cast intrinsics to use __builtin_nondeterministic_value

[Manuel Brito via Phabricator via cfe-commits]

ManuelJBrito created this revision.
ManuelJBrito added reviewers: craig.topper, RKSimon.
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The following intrinsics are currently implemented using a shufflevector with an undefined mask, this is however incorrect according to intel's semantics for undefined value which expect an unknown but consistent value.

With `__builtin_nondeterministic_value` we can now match intel's undefined value.

Related patch for more context : https://reviews.llvm.org/D103874


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143287

Files:
  clang/lib/Headers/avx512fintrin.h
  clang/lib/Headers/avx512fp16intrin.h
  clang/lib/Headers/avxintrin.h
  clang/test/CodeGen/X86/avx-builtins.c
  clang/test/CodeGen/X86/avx512f-builtins.c
  clang/test/CodeGen/X86/avx512fp16-builtins.c

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