diff options
Diffstat (limited to 'gcc/profile-count.c')
| -rw-r--r-- | gcc/profile-count.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/gcc/profile-count.c b/gcc/profile-count.c index d703140..9c57323 100644 --- a/gcc/profile-count.c +++ b/gcc/profile-count.c @@ -255,3 +255,29 @@ profile_count::to_cgraph_frequency (profile_count entry_bb_count) const return CGRAPH_FREQ_MAX; return MIN (scale, CGRAPH_FREQ_MAX); } + +/* We want to scale profile across function boundary from NUM to DEN. + Take care of the side case when DEN is zeros. We still want to behave + sanely here which means + - scale to profile_count::zero () if NUM is profile_count::zero + - do not affect anything if NUM == DEN + - preserve counter value but adjust quality in other cases. */ + +void +profile_count::adjust_for_ipa_scaling (profile_count *num, + profile_count *den) +{ + /* Scaling is no-op if NUM and DEN are the same. */ + if (*num == *den) + return; + /* Scaling to zero is always zeor. */ + if (*num == profile_count::zero ()) + return; + /* If den is non-zero we are safe. */ + if (den->force_nonzero () == *den) + return; + /* Force both to non-zero so we do not push profiles to 0 when + both num == 0 and den == 0. */ + *den = den->force_nonzero (); + *num = num->force_nonzero (); +} |