* predict.c (estimate_probability): If no prediction was found, then
predict the successor that is the next physical block (if such a
successor exists).
From-SVN: r33683
+Thu May 4 14:37:23 2000 Jeffrey A Law (law@cygnus.com)
+
+ * predict.c (estimate_probability): If no prediction was found, then
+ predict the successor that is the next physical block (if such a
+ successor exists).
+
2000-05-04 Richard Henderson <rth@cygnus.com>
* config/alpha/t-alpha (LIB2FUNCS_EXTRA): Use qrrnd.asm in place.
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;