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 0d1e338..7182513 100644 --- a/gcc/tree-vect-data-refs.c +++ b/gcc/tree-vect-data-refs.c @@ -2287,7 +2287,9 @@ vect_analyze_data_ref_access (struct data_reference *dr) } /* Consecutive? */ - if (!tree_int_cst_compare (step, TYPE_SIZE_UNIT (scalar_type))) + if (!tree_int_cst_compare (step, TYPE_SIZE_UNIT (scalar_type)) + || (dr_step < 0 + && !compare_tree_int (TYPE_SIZE_UNIT (scalar_type), -dr_step))) { /* Mark that it is not interleaving. */ DR_GROUP_FIRST_DR (vinfo_for_stmt (stmt)) = NULL; @@ -2970,6 +2972,7 @@ vect_create_data_ref_ptr (gimple stmt, struct loop *at_loop, tree vptr; gimple_stmt_iterator incr_gsi; bool insert_after; + bool negative; tree indx_before_incr, indx_after_incr; gimple incr; tree step; @@ -3002,6 +3005,7 @@ vect_create_data_ref_ptr (gimple stmt, struct loop *at_loop, *inv_p = true; else *inv_p = false; + negative = tree_int_cst_compare (step, size_zero_node) < 0; /* Create an expression for the first address accessed by this load in LOOP. */ @@ -3160,6 +3164,8 @@ vect_create_data_ref_ptr (gimple stmt, struct loop *at_loop, LOOP is zero. In this case the step here is also zero. */ if (*inv_p) step = size_zero_node; + else if (negative) + step = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); standard_iv_increment_position (loop, &incr_gsi, &insert_after); |