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re PR bootstrap/57154 (Bootstrap broken for powerpc64-unknown-linux-gnu) 

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.

From-SVN: r198584
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Teresa Johnson 2013-05-03 16:48:24 +00:00 committed by Teresa Johnson
parent ade67f7007
commit 68f073d4df
2 changed files with 12 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
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

6
gcc/sched-rgn.c
View File

@ -1442,6 +1442,12 @@ compute_dom_prob_ps (int bb)
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);