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| author | Sjoerd Meijer <sjoerd.meijer@arm.com> | 2019-10-14 07:40:36 +0000 |
|---|---|---|
| committer | Sjoerd Meijer <sjoerd.meijer@arm.com> | 2019-10-14 07:40:36 +0000 |
| commit | 5dceabfe017f72812966261ba8326c83d709729e (patch) | |
| tree | 68ce7e44bf93f0c36d2a34fe9eb4f0d3faaab3fd /docs | |
| parent | 604dda360a6d644c4f3f046b2e73b9581e37dd30 (diff) | |
| download | clang-5dceabfe017f72812966261ba8326c83d709729e.tar.gz | |
[docs] loop pragmas: options implying transformations
Following our discussion on the cfe dev list:
http://lists.llvm.org/pipermail/cfe-dev/2019-August/063054.html,
I have added a paragraph that is explicit about loop pragmas, and
transformation options implying the corresponding transformation.
Differential Revision: https://reviews.llvm.org/D66199
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374756 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LanguageExtensions.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst index 903d450059..967f4ad9bb 100644 --- a/docs/LanguageExtensions.rst +++ b/docs/LanguageExtensions.rst @@ -3027,6 +3027,14 @@ provides options for vectorization, interleaving, predication, unrolling and distribution. Loop hints can be specified before any loop and will be ignored if the optimization is not safe to apply. +There are loop hints that control transformations (e.g. vectorization, loop +unrolling) and there are loop hints that set transformation options (e.g. +``vectorize_width``, ``unroll_count``). Pragmas setting transformation options +imply the transformation is enabled, as if it was enabled via the corresponding +transformation pragma (e.g. ``vectorize(enable)``). If the transformation is +disabled (e.g. ``vectorize(disable)``), that takes precedence over +transformations option pragmas implying that transformation. + Vectorization, Interleaving, and Predication -------------------------------------------- |