tree-ssa-loop-prefetch.c (determine_loop_nest_reuse): Return whether we failed to compute data dependences.
2012-05-07 Richard Guenther <rguenther@suse.de> * tree-ssa-loop-prefetch.c (determine_loop_nest_reuse): Return whether we failed to compute data dependences. (loop_prefetch_arrays): Fail if we failed. From-SVN: r187227
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@ -1,3 +1,9 @@
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2012-05-07 Richard Guenther <rguenther@suse.de>
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* tree-ssa-loop-prefetch.c (determine_loop_nest_reuse): Return
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whether we failed to compute data dependences.
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(loop_prefetch_arrays): Fail if we failed.
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2012-05-07 Uros Bizjak <ubizjak@gmail.com>
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Paolo Bonzini <bonzini@gnu.org>
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@ -1495,9 +1495,9 @@ self_reuse_distance (data_reference_p dr, unsigned *loop_sizes, unsigned n,
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/* Determines the distance till the first reuse of each reference in REFS
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in the loop nest of LOOP. NO_OTHER_REFS is true if there are no other
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memory references in the loop. */
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memory references in the loop. Return false if the analysis fails. */
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static void
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static bool
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determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs,
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bool no_other_refs)
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{
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@ -1515,7 +1515,7 @@ determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs,
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ddr_p dep;
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if (loop->inner)
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return;
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return true;
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/* Find the outermost loop of the loop nest of loop (we require that
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there are no sibling loops inside the nest). */
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@ -1585,7 +1585,8 @@ determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs,
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ref->independent_p = true;
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}
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compute_all_dependences (datarefs, &dependences, vloops, true);
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if (!compute_all_dependences (datarefs, &dependences, vloops, true))
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return false;
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FOR_EACH_VEC_ELT (ddr_p, dependences, i, dep)
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{
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@ -1664,6 +1665,8 @@ determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs,
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fprintf (dump_file, " ref %p distance %u\n",
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(void *) ref, ref->reuse_distance);
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}
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return true;
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}
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/* Determine whether or not the trip count to ahead ratio is too small based
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@ -1826,7 +1829,8 @@ loop_prefetch_arrays (struct loop *loop)
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if (nothing_to_prefetch_p (refs))
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goto fail;
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determine_loop_nest_reuse (loop, refs, no_other_refs);
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if (!determine_loop_nest_reuse (loop, refs, no_other_refs))
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goto fail;
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/* Step 3: determine unroll factor. */
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unroll_factor = determine_unroll_factor (loop, refs, ninsns, &desc,
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