[PATCH] D40230: Add -mprefer-vector-width driver option and attribute during CodeGen.

[Craig Topper via Phabricator via cfe-commits]

craig.topper updated this revision to Diff 123709.
craig.topper added a comment.

Still pass the attribute the backend if the value is 'none'.

We actually need this to know if the user specified the command line option at all. The value of 'none' should disable limits and prevents needing to pick a specific value.


https://reviews.llvm.org/D40230

Files:
  docs/ClangCommandLineReference.rst
  include/clang/Driver/Options.td
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/CGCall.cpp
  lib/Driver/ToolChains/Clang.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/attr-mprefer-vector-width.c
  test/Driver/mprefer-vector-width.c

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