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| author | Jan Hubicka <hubicka@ucw.cz> | 2019-12-05 19:12:51 +0100 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2019-12-05 18:12:51 +0000 |
| commit | 34fbe3f0946f88828765184ed6581bda62cdf49f (patch) | |
| tree | 5a3bf82ae6bb92203c6e4922a5d694198595edc6 /gcc/doc/invoke.texi | |
| parent | 8575d5925226a8f92ee644d6d59a2b1b93840d94 (diff) | |
| download | gcc-34fbe3f0946f88828765184ed6581bda62cdf49f.zip gcc-34fbe3f0946f88828765184ed6581bda62cdf49f.tar.gz gcc-34fbe3f0946f88828765184ed6581bda62cdf49f.tar.bz2 | |
cgraphclones.c (localize_profile): New function.
* cgraphclones.c (localize_profile): New function.
(cgraph_node::create_clone): Use it for partial profiles.
* common.opt (fprofile-partial-training): New flag.
* doc/invoke.texi (-fprofile-partial-training): Document.
* ipa-cp.c (update_profiling_info): For partial profiles do not
set function profile to zero.
* profile.c (compute_branch_probabilities): With partial profile
watch if edge count is zero and turn all probabilities to guessed.
(compute_branch_probabilities): For partial profiles do not apply
profile when entry count is zero.
* tree-profile.c (tree_profiling): Only do value_profile_transformations
when profile is read.
From-SVN: r279013
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index d165f31..af3c7f2 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -453,8 +453,8 @@ Objective-C and Objective-C++ Dialects}. -fpartial-inlining -fpeel-loops -fpredictive-commoning @gol -fprefetch-loop-arrays @gol -fprofile-correction @gol --fprofile-use -fprofile-use=@var{path} -fprofile-values @gol --fprofile-reorder-functions @gol +-fprofile-use -fprofile-use=@var{path} -fprofile-partial-training @gol +-fprofile-values -fprofile-reorder-functions @gol -freciprocal-math -free -frename-registers -freorder-blocks @gol -freorder-blocks-algorithm=@var{algorithm} @gol -freorder-blocks-and-partition -freorder-functions @gol @@ -10634,6 +10634,19 @@ default, GCC emits an error message when an inconsistent profile is detected. This option is enabled by @option{-fauto-profile}. +@item -fprofile-partial-training +@opindex fprofile-use +With @code{-fprofile-use} all portions of programs not executed during train +run are optimized agressively for size rather than speed. In some cases it is +not practical to train all possible hot paths in the program. (For +example, program may contain functions specific for a given hardware and +trianing may not cover all hardware configurations program is run on.) With +@code{-fprofile-partial-training} profile feedback will be ignored for all +functions not executed during the train run leading them to be optimized as if +they were compiled without profile feedback. This leads to better performance +when train run is not representative but also leads to significantly bigger +code. + @item -fprofile-use @itemx -fprofile-use=@var{path} @opindex fprofile-use |