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| author | Adam Nemet <anemet@apple.com> | 2016-09-12 23:48:16 +0000 |
|---|---|---|
| committer | Adam Nemet <anemet@apple.com> | 2016-09-12 23:48:16 +0000 |
| commit | fd2a481cd92f3a613baa0f218ac680115590ff6a (patch) | |
| tree | 04a9ebb9ff5e4a136eee8ab9a1ae6d575892151a /include/clang/Frontend/CodeGenOptions.def | |
| parent | ec69ba2e71f0cd8f4456833cafb0cb1c7fcca32e (diff) | |
Add -fdiagnostics-show-hotness
Summary:
I've recently added the ability for optimization remarks to include the
hotness of the corresponding code region. This uses PGO and allows
filtering of the optimization remarks by relevance. The idea was first
discussed here:
http://thread.gmane.org/gmane.comp.compilers.llvm.devel/98334
The general goal is to produce a YAML file with the remarks. Then, an
external tool could dynamically filter these by hotness and perhaps by
other things.
That said it makes sense to also expose this at the more basic level
where we just include the hotness info with each optimization remark.
For example, in D22694, the clang flag was pretty useful to measure the
overhead of the additional analyses required to include hotness.
(Without the flag we don't even run the analyses.)
For the record, Hal has already expressed support for the idea of this
patch on IRC.
Differential Revision: https://reviews.llvm.org/D23284
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@281276 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/clang/Frontend/CodeGenOptions.def')
| -rw-r--r-- | include/clang/Frontend/CodeGenOptions.def | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/clang/Frontend/CodeGenOptions.def b/include/clang/Frontend/CodeGenOptions.def index 677baa931e..5ebbc2cbd6 100644 --- a/include/clang/Frontend/CodeGenOptions.def +++ b/include/clang/Frontend/CodeGenOptions.def @@ -247,6 +247,9 @@ ENUM_CODEGENOPT(DefaultTLSModel, TLSModel, 2, GeneralDynamicTLSModel) /// filename) VALUE_CODEGENOPT(EmitCheckPathComponentsToStrip, 32, 0) +/// Whether to report the hotness of the code region for optimization remarks. +CODEGENOPT(DiagnosticsWithHotness, 1, 0) + #undef CODEGENOPT #undef ENUM_CODEGENOPT #undef VALUE_CODEGENOPT |