PR bootstrap/57154
* sched-rgn.c (compute_dom_prob_ps): Ensure accumulated probabilities
do not exceed REG_BR_PROB_BASE.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198584
138bc75d-0d04-0410-961f-
82ee72b054a4
+2013-05-03 Teresa Johnson <tejohnson@google.com>
+
+ PR bootstrap/57154
+ * sched-rgn.c (compute_dom_prob_ps): Ensure accumulated probabilities
+ do not exceed REG_BR_PROB_BASE.
+
2013-05-03 Jeff Law <law@redhat.com>
PR tree-optimization/57144
bitmap_set_bit (pot_split[bb], EDGE_TO_BIT (out_edge));
prob[bb] += combine_probabilities (prob[pred_bb], in_edge->probability);
+ // The rounding divide in combine_probabilities can result in an extra
+ // probability increment propagating along 50-50 edges. Eventually when
+ // the edges re-merge, the accumulated probability can go slightly above
+ // REG_BR_PROB_BASE.
+ if (prob[bb] > REG_BR_PROB_BASE)
+ prob[bb] = REG_BR_PROB_BASE;
}
bitmap_set_bit (dom[bb], bb);