This applies overflow heuristics to maybe_hot_frequency_p to make sure not everything is thought to be cold (which happens when building polyhedron AIR with -fwhole-program).
Bootstrapped and tested on x86_64-unknown-linux-gnu, approved by Honza on IRC. Richard. 2011-07-26 Richard Guenther <rguent...@suse.de> * predict.c (maybe_hot_frequency_p): Make sure a zero entry-block frequency makes everything hot. Index: gcc/predict.c =================================================================== --- gcc/predict.c (revision 176789) +++ gcc/predict.c (working copy) @@ -124,7 +124,7 @@ maybe_hot_frequency_p (int freq) if (profile_status == PROFILE_ABSENT) return true; if (node->frequency == NODE_FREQUENCY_EXECUTED_ONCE - && freq <= (ENTRY_BLOCK_PTR->frequency * 2 / 3)) + && freq < (ENTRY_BLOCK_PTR->frequency * 2 / 3)) return false; if (freq < ENTRY_BLOCK_PTR->frequency / PARAM_VALUE (HOT_BB_FREQUENCY_FRACTION)) return false;