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| author | Teresa Johnson <tejohnson@google.com> | 2013-05-03 16:48:24 +0000 |
|---|---|---|
| committer | Teresa Johnson <tejohnson@gcc.gnu.org> | 2013-05-03 16:48:24 +0000 |
| commit | 68f073d4df711a367346c0765bf2bee0358f9fea (patch) | |
| tree | 89e12c60929c3e92a4552c8cf753f89bea5e4805 /gcc | |
| parent | ade67f70072586cc520001098112e7148e80f0f9 (diff) | |
| download | gcc-68f073d4df711a367346c0765bf2bee0358f9fea.zip gcc-68f073d4df711a367346c0765bf2bee0358f9fea.tar.gz gcc-68f073d4df711a367346c0765bf2bee0358f9fea.tar.bz2 | |
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
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/sched-rgn.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e0ddef9..616db86 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/sched-rgn.c b/gcc/sched-rgn.c index 3f5b4ba1..2c971e2 100644 --- a/gcc/sched-rgn.c +++ b/gcc/sched-rgn.c @@ -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); |