diff options
Diffstat (limited to 'gcc/predict.c')
| -rw-r--r-- | gcc/predict.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/gcc/predict.c b/gcc/predict.c index 06da1cd..ddf72d2 100644 --- a/gcc/predict.c +++ b/gcc/predict.c @@ -232,8 +232,22 @@ bool probably_never_executed_bb_p (struct function *fun, const_basic_block bb) { gcc_checking_assert (fun); - if (profile_info && flag_branch_probabilities) - return ((bb->count + profile_info->runs / 2) / profile_info->runs) == 0; + if (profile_status_for_function (fun) == PROFILE_READ) + { + if ((bb->count * 4 + profile_info->runs / 2) / profile_info->runs > 0) + return false; + if (!bb->frequency) + return true; + if (!ENTRY_BLOCK_PTR->frequency) + return false; + if (ENTRY_BLOCK_PTR->count && ENTRY_BLOCK_PTR->count < REG_BR_PROB_BASE) + { + return (RDIV (bb->frequency * ENTRY_BLOCK_PTR->count, + ENTRY_BLOCK_PTR->frequency) + < REG_BR_PROB_BASE / 4); + } + return true; + } if ((!profile_info || !flag_branch_probabilities) && (cgraph_get_node (fun->decl)->frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED)) |