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| author | Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> | 2003-07-30 21:23:34 +0200 |
|---|---|---|
| committer | Zdenek Dvorak <rakdver@gcc.gnu.org> | 2003-07-30 19:23:34 +0000 |
| commit | 6e885ee3ff4f358d7a7e84b8687f27a61101a25f (patch) | |
| tree | 3736c245736a667b97a048cf693be5fe11ae12ef /gcc/value-prof.c | |
| parent | fd9b4d64fb349ebc9c6aa1fb7f44ce3b42614032 (diff) | |
| download | gcc-6e885ee3ff4f358d7a7e84b8687f27a61101a25f.zip gcc-6e885ee3ff4f358d7a7e84b8687f27a61101a25f.tar.gz gcc-6e885ee3ff4f358d7a7e84b8687f27a61101a25f.tar.bz2 | |
combine.c (distribute_notes): Cancel REG_VALUE_PROFILE notes.
* combine.c (distribute_notes): Cancel REG_VALUE_PROFILE notes.
* gcov-io.h (GCOV_FIRST_VALUE_COUNTER, GCOV_LAST_VALUE_COUNTER,
GCOV_N_VALUE_COUNTERS): New.
* profile.c (compute_value_histograms): New static function.
(branch_prob): Read back the value histograms.
* rtl.c (reg_note_name): Add name for REG_VALUE_PROFILE note.
* rtl.h (enum reg_note): Add REG_VALUE_PROFILE note.
* value-prof.c: Add comment on reading the profile.
* value-prof.h (COUNTER_FOR_HIST_TYPE, HIST_TYPE_FOR_COUNTER): New.
* doc/invoke.texi (-fprofile-values): Document behavior with
-fbranch-probabilities.
From-SVN: r69969
Diffstat (limited to 'gcc/value-prof.c')
| -rw-r--r-- | gcc/value-prof.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/gcc/value-prof.c b/gcc/value-prof.c index e843ddb..171b304 100644 --- a/gcc/value-prof.c +++ b/gcc/value-prof.c @@ -40,9 +40,14 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA insn_values_to_profile function. This function is called from branch_prob in profile.c and the requested values are instrumented by it in the first compilation with -fprofile-arcs. The optimization may then read the - gathered data in the second compilation with -fbranch-probabilities (the - description of an exact way how to do it will be added here once the - code responsible for reading of the data is merged). */ + gathered data in the second compilation with -fbranch-probablities. + The measured data is appended as REG_VALUE_PROFILE note to the instrumented + insn. The argument to the note consists of an EXPR_LIST where its + members have the following meaning (from the first to the last): + + -- type of information gathered (HIST_TYPE*) + -- the expression that is profiled + -- list of counters starting from the first one. */ static void insn_values_to_profile (rtx, unsigned *, struct histogram_value **); |