diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 14 |
2 files changed, 15 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index bba151a..6317962 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +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. + 2012-05-07 Uros Bizjak <ubizjak@gmail.com> Paolo Bonzini <bonzini@gnu.org> diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 19a6a22..00f30a1 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -1495,9 +1495,9 @@ self_reuse_distance (data_reference_p dr, unsigned *loop_sizes, unsigned n, /* Determines the distance till the first reuse of each reference in REFS in the loop nest of LOOP. NO_OTHER_REFS is true if there are no other - memory references in the loop. */ + memory references in the loop. Return false if the analysis fails. */ -static void +static bool determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs, bool no_other_refs) { @@ -1515,7 +1515,7 @@ determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs, ddr_p dep; if (loop->inner) - return; + return true; /* Find the outermost loop of the loop nest of loop (we require that there are no sibling loops inside the nest). */ @@ -1585,7 +1585,8 @@ determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs, ref->independent_p = true; } - compute_all_dependences (datarefs, &dependences, vloops, true); + if (!compute_all_dependences (datarefs, &dependences, vloops, true)) + return false; FOR_EACH_VEC_ELT (ddr_p, dependences, i, dep) { @@ -1664,6 +1665,8 @@ determine_loop_nest_reuse (struct loop *loop, struct mem_ref_group *refs, fprintf (dump_file, " ref %p distance %u\n", (void *) ref, ref->reuse_distance); } + + return true; } /* Determine whether or not the trip count to ahead ratio is too small based @@ -1826,7 +1829,8 @@ loop_prefetch_arrays (struct loop *loop) if (nothing_to_prefetch_p (refs)) goto fail; - determine_loop_nest_reuse (loop, refs, no_other_refs); + if (!determine_loop_nest_reuse (loop, refs, no_other_refs)) + goto fail; /* Step 3: determine unroll factor. */ unroll_factor = determine_unroll_factor (loop, refs, ninsns, &desc, |