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* predict.c (estimate_probability): Fix roundoff error.

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From-SVN: r62765
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Jan Hubicka 2003-02-12 15:23:20 +01:00 committed by Jan Hubicka
parent 9083b5dab9
commit 6efcd26809
2 changed files with 12 additions and 3 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Wed Feb 12 15:19:42 CET 2003 Jan Hubicka <jh@suse.cz>
* predict.c (estimate_probability): Fix roundoff error.
2003-02-12 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (a peephole2): Don't handle 65535.

11
gcc/predict.c
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@ -449,14 +449,19 @@ estimate_probability (loops_info)
if (simple_loop_p (loops_info, loop, &desc)
&& desc.const_iter)
{
int prob;
niter = desc.niter + 1;
if (niter == 0) /* We might overflow here. */
niter = desc.niter;
prob = (REG_BR_PROB_BASE
- (REG_BR_PROB_BASE + niter /2) / niter);
/* Branch prediction algorithm gives 0 frequency for everything
after the end of loop for loop having 0 probability to finish. */
if (prob == REG_BR_PROB_BASE)
prob = REG_BR_PROB_BASE - 1;
predict_edge (desc.in_edge, PRED_LOOP_ITERATIONS,
REG_BR_PROB_BASE
- (REG_BR_PROB_BASE + niter /2)
/ niter);
prob);
}
bbs = get_loop_body (loop);