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

[Craig Topper via Phabricator via cfe-commits]

craig.topper created this revision.

This adds a new command line option -mprefer-vector-width to specify a preferred vector width for the vectorizers. Valid values are 'none' and unsigned integers. The driver will check that it meets those constraints. Specific supported integers will be managed by the targets in the backend.

Clang will take the value and add it as a new function attribute during CodeGen.

This represents the alternate direction proposed by Sanjay in this RFC: http://lists.llvm.org/pipermail/llvm-dev/2017-November/118734.html

This supercedes https://reviews.llvm.org/D39576


https://reviews.llvm.org/D40230

Files:
  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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