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predict.c: Remove May 4 change.

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* predict.c: Remove May 4 change.
        * bb-reorder.c (make_reorder_chain): Do not perform block movement
        if we have predicted the branch at 50-50 probability.

From-SVN: r33707
This commit is contained in:
Jeffrey A Law 2000-05-05 16:13:46 +00:00 committed by Jeff Law
parent 327f248083
commit cde9b87dfb
3 changed files with 7 additions and 14 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Fri May 5 10:11:41 2000 Jeffrey A Law (law@cygnus.com)
* predict.c: Remove May 4 change.
* bb-reorder.c (make_reorder_chain): Do not perform block movement
if we have predicted the branch at 50-50 probability.
2000-05-05 Richard Henderson <rth@cygnus.com>
* flow.c (init_propagate_block_info): Fix merge error

2
gcc/bb-reorder.c
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@ -478,7 +478,7 @@ make_reorder_chain (bb)
else
probability = 0;
if (probability >= REG_BR_PROB_BASE / 2)
if (probability > REG_BR_PROB_BASE / 2)
e = bb->succ->succ_next;
}

13
gcc/predict.c
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@ -202,19 +202,6 @@ estimate_probability (loops_info)
break;
}
/* If one of the blocks already directly follows the current
block, then predict it as the taken path. This reduces
random block movement. */
for (e = BASIC_BLOCK (i)->succ; e; e = e->succ_next)
if (e->dest->index == i + 1)
{
if (e->flags & EDGE_FALLTHRU)
prob = 0;
else
prob = REG_BR_PROB_BASE;
goto emitnote;
}
/* If we havn't chosen something by now, predict 50-50. */
prob = REG_BR_PROB_BASE / 2;