[PATCH] D142948: [OpenCL] Disable vector to scalar types coercion for OpenCL

[Chunyang, Dai via Phabricator via cfe-commits]

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For x86 target, vector types (both result and arguments) can be coerced
to scalars of the same size, e.g:

  define zeroext i1 @_Z18convert_ulong4_rteDv4_t(<4 x i16> %x)
  ; becomes
  define zeroext i1 @_Z18convert_ulong4_rteDv4_t(i64 %x.coerced)

Such behavior is completely valid for x86, but the backend vectorizer
cannot work with scalars instead of vectors.

With this patch, argument and result types will be leaved unchanged in
the CodeGen.

New option fopencl-force-vector-abi is also added to force-disables
vector to scalar coercion when provided.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142948

Files:
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/TargetInfo.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGenOpenCL/vector-to-scalar-coercion.cl

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