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cfg.c (update_bb_profile_for_threading): Do not rescale the successor probabilities if they are not going to change.

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* cfg.c (update_bb_profile_for_threading): Do not rescale the
        successor probabilities if they are not going to change.  Pull
        division out of loop if we do need to rescale successor probabilities.

From-SVN: r90987
This commit is contained in:
Jeff Law 2004-11-21 13:41:37 -07:00 committed by Jeff Law
parent 926253eeca
commit 763ea90493
2 changed files with 11 additions and 3 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2004-11-21 Jeff Law <law@redhat.com>
* cfg.c (update_bb_profile_for_threading): Do not rescale the
successor probabilities if they are not going to change. Pull
division out of loop if we do need to rescale successor probabilities.
* tree-ssa-threadupdate.c (redirection_data_hash): Use the
index of the destination block for the hash value rather than
hashing a pointer.

10
gcc/cfg.c
View File

@ -941,9 +941,13 @@ update_bb_profile_for_threading (basic_block bb, int edge_frequency,
for (; (c = ei_safe_edge (ei)); ei_next (&ei))
c->probability = 0;
}
else
FOR_EACH_EDGE (c, ei, bb->succs)
c->probability = ((c->probability * REG_BR_PROB_BASE) / (double) prob);
else if (prob != REG_BR_PROB_BASE)
{
int scale = REG_BR_PROB_BASE / prob;
FOR_EACH_EDGE (c, ei, bb->succs)
c->probability *= scale;
}
if (bb != taken_edge->src)
abort ();