diff options
Diffstat (limited to 'gcc/tree-vect-data-refs.c')
| -rw-r--r-- | gcc/tree-vect-data-refs.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c index 084469f..0ab8e6b 100644 --- a/gcc/tree-vect-data-refs.c +++ b/gcc/tree-vect-data-refs.c @@ -227,6 +227,12 @@ vect_analyze_data_ref_dependence (struct data_dependence_relation *ddr, || (DR_IS_READ (dra) && DR_IS_READ (drb))) return false; + /* We do not have to consider dependences between accesses that belong + to the same group. */ + if (GROUP_FIRST_ELEMENT (stmtinfo_a) + && GROUP_FIRST_ELEMENT (stmtinfo_a) == GROUP_FIRST_ELEMENT (stmtinfo_b)) + return false; + /* Even if we have an anti-dependence then, as the vectorized loop covers at least two scalar iterations, there is always also a true dependence. As the vectorizer does not re-order loads and stores we can ignore @@ -469,7 +475,7 @@ vect_analyze_data_ref_dependences (loop_vec_info loop_vinfo, int *max_vf) LOOP_VINFO_NO_DATA_DEPENDENCIES (loop_vinfo) = true; if (!compute_all_dependences (LOOP_VINFO_DATAREFS (loop_vinfo), &LOOP_VINFO_DDRS (loop_vinfo), - LOOP_VINFO_LOOP_NEST (loop_vinfo), true)) + LOOP_VINFO_LOOP_NEST (loop_vinfo), false)) return false; FOR_EACH_VEC_ELT (LOOP_VINFO_DDRS (loop_vinfo), i, ddr) |