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| author | Martin Liska <mliska@suse.cz> | 2016-08-10 15:11:42 +0200 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2016-08-10 13:11:42 +0000 |
| commit | 22063dbc90d0eb8a7cc7939e0941899f90b403db (patch) | |
| tree | bca16f60942cfafd651fca3cbf08a464365e76b9 /gcc/doc/invoke.texi | |
| parent | 5a39e998c8a89b26a74b9fb0b5bc17fa8b55d274 (diff) | |
| download | gcc-22063dbc90d0eb8a7cc7939e0941899f90b403db.zip gcc-22063dbc90d0eb8a7cc7939e0941899f90b403db.tar.gz gcc-22063dbc90d0eb8a7cc7939e0941899f90b403db.tar.bz2 | |
Cherry-pick fprofile-generate-atomic from google/gcc-4_9
Cherry picked (and modified) from google-4_7 branch
2012-12-26 Rong Xu <xur@google.com>
* common.opt (fprofile-update): Add new flag.
* coretypes.h: Define enum profile_update.
* doc/invoke.texi: Document -fprofile-update.
* gcov-io.h: Declare GCOV_TYPE_ATOMIC_FETCH_ADD and
GCOV_TYPE_ATOMIC_FETCH_ADD_FN.
* tree-profile.c (gimple_init_edge_profiler): Generate
also atomic profiler update.
(gimple_gen_edge_profiler): Likewise.
* g++.dg/gcov/gcov-threads-1.C: New test.
From-SVN: r239323
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 22001f9..1cfaae7 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -9933,6 +9933,18 @@ the profile feedback data files. See @option{-fprofile-dir}. To optimize the program based on the collected profile information, use @option{-fprofile-use}. @xref{Optimize Options}, for more information. +@item -fprofile-update=@var{method} +@opindex fprofile-update + +Alter the update method for an application instrumented for profile +feedback based optimization. The @var{method} argument should be one of +@samp{single} or @samp{atomic}. The first one is useful for single-threaded +applications, while the second one prevents profile corruption by emitting +thread-safe code. + +@strong{Warning:} When an application does not properly join all threads +(or creates an detached thread), a profile file can be still corrupted. + @item -fsanitize=address @opindex fsanitize=address Enable AddressSanitizer, a fast memory error detector. |