re PR rtl-optimization/19078 (Poor quality code after loop unrolling.)
PR rtl-optimization/19078 * tree-ssa-loop-ivopts.c (determine_use_iv_cost_generic, determine_use_iv_cost_outer): Fix computing of cost for the original bivs. (dump_use): Handle case related_cands == NULL. From-SVN: r92608
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@ -1,3 +1,11 @@
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2004-12-25 Zdenek Dvorak <dvorakz@suse.cz>
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PR rtl-optimization/19078
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* tree-ssa-loop-ivopts.c (determine_use_iv_cost_generic,
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determine_use_iv_cost_outer): Fix computing of cost for the original
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bivs.
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(dump_use): Handle case related_cands == NULL.
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2004-12-25 Marek Michalkiewicz <marekm@amelek.gda.pl>
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PR target/19059
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@ -444,8 +444,11 @@ dump_use (FILE *file, struct iv_use *use)
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dump_iv (file, use->iv);
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fprintf (file, " related candidates ");
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dump_bitmap (file, use->related_cands);
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if (use->related_cands)
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{
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fprintf (file, " related candidates ");
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dump_bitmap (file, use->related_cands);
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}
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}
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/* Dumps information about the uses to FILE. */
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@ -3116,8 +3119,20 @@ determine_use_iv_cost_generic (struct ivopts_data *data,
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struct iv_use *use, struct iv_cand *cand)
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{
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bitmap depends_on;
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unsigned cost = get_computation_cost (data, use, cand, false, &depends_on);
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unsigned cost;
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/* The simple case first -- if we need to express value of the preserved
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original biv, the cost is 0. This also prevents us from counting the
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cost of increment twice -- once at this use and once in the cost of
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the candidate. */
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if (cand->pos == IP_ORIGINAL
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&& cand->incremented_at == use->stmt)
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{
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set_use_iv_cost (data, use, cand, 0, NULL);
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return true;
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}
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cost = get_computation_cost (data, use, cand, false, &depends_on);
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set_use_iv_cost (data, use, cand, cost, depends_on);
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return cost != INFTY;
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@ -3311,7 +3326,18 @@ determine_use_iv_cost_outer (struct ivopts_data *data,
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edge exit;
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tree value;
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struct loop *loop = data->current_loop;
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/* The simple case first -- if we need to express value of the preserved
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original biv, the cost is 0. This also prevents us from counting the
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cost of increment twice -- once at this use and once in the cost of
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the candidate. */
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if (cand->pos == IP_ORIGINAL
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&& cand->incremented_at == use->stmt)
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{
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set_use_iv_cost (data, use, cand, 0, NULL);
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return true;
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}
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if (!cand->iv)
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{
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if (!may_replace_final_value (loop, use, &value))
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