diff options
Diffstat (limited to 'gcc/tree-loop-distribution.c')
| -rw-r--r-- | gcc/tree-loop-distribution.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c index f340eab..b24af33 100644 --- a/gcc/tree-loop-distribution.c +++ b/gcc/tree-loop-distribution.c @@ -1011,6 +1011,39 @@ classify_partition (loop_p loop, struct graph *rdg, partition_t partition) || !operand_equal_p (DR_STEP (single_store), DR_STEP (single_load), 0)) return; + /* Now check that if there is a dependence this dependence is + of a suitable form for memmove. */ + VEC(loop_p, heap) *loops = NULL; + ddr_p ddr; + VEC_safe_push (loop_p, heap, loops, loop); + ddr = initialize_data_dependence_relation (single_load, single_store, + loops); + compute_affine_dependence (ddr, loop); + VEC_free (loop_p, heap, loops); + if (DDR_ARE_DEPENDENT (ddr) == chrec_dont_know) + { + free_dependence_relation (ddr); + return; + } + if (DDR_ARE_DEPENDENT (ddr) != chrec_known) + { + if (DDR_NUM_DIST_VECTS (ddr) == 0) + { + free_dependence_relation (ddr); + return; + } + lambda_vector dist_v; + FOR_EACH_VEC_ELT (lambda_vector, DDR_DIST_VECTS (ddr), i, dist_v) + { + int dist = dist_v[index_in_loop_nest (loop->num, + DDR_LOOP_NEST (ddr))]; + if (dist > 0 && !DDR_REVERSED_P (ddr)) + { + free_dependence_relation (ddr); + return; + } + } + } partition->kind = PKIND_MEMCPY; partition->main_dr = single_store; partition->secondary_dr = single_load; |