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| author | Craig Topper <craig.topper@intel.com> | 2017-12-11 21:09:19 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2017-12-11 21:09:19 +0000 |
| commit | ce4e832999f969100f4780773f384da2561d573b (patch) | |
| tree | 10b43543694ca970dfec61c8803afcccbc9d0d8f /docs | |
| parent | c9d3180bac1e8616c883c794a4d9ec7f86e03c27 (diff) | |
[Driver][CodeGen] Add -mprefer-vector-width driver option and attribute during CodeGen.
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
The syntax here matches gcc, though gcc treats it as an x86 specific command line argument. gcc only allows values of 128, 256, and 512. I'm not having clang check any values.
Differential Revision: https://reviews.llvm.org/D40230
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@320419 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/ClangCommandLineReference.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/ClangCommandLineReference.rst b/docs/ClangCommandLineReference.rst index 9755efa2b8..4d095883a4 100644 --- a/docs/ClangCommandLineReference.rst +++ b/docs/ClangCommandLineReference.rst @@ -2120,6 +2120,10 @@ Omit frame pointer setup for leaf functions Use copy relocations support for PIE builds +.. option:: -mprefer-vector-width=<arg> + +Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions. + .. option:: -mqdsp6-compat Enable hexagon-qdsp6 backward compatibility |