diff options
Diffstat (limited to 'gcc/tree-data-ref.c')
| -rw-r--r-- | gcc/tree-data-ref.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/gcc/tree-data-ref.c b/gcc/tree-data-ref.c index 07b311a..88f6347 100644 --- a/gcc/tree-data-ref.c +++ b/gcc/tree-data-ref.c @@ -2818,9 +2818,9 @@ constant_access_functions (const struct data_dependence_relation *ddr) return true; } - /* Helper function for the case where DDR_A and DDR_B are the same - multivariate access function. */ + multivariate access function with a constant step. For an example + see pr34635-1.c. */ static void add_multivariate_self_dist (struct data_dependence_relation *ddr, tree c_2) @@ -2890,7 +2890,17 @@ add_other_self_distances (struct data_dependence_relation *ddr) return; } - add_multivariate_self_dist (ddr, DR_ACCESS_FN (DDR_A (ddr), 0)); + access_fun = DR_ACCESS_FN (DDR_A (ddr), 0); + + if (TREE_CODE (CHREC_LEFT (access_fun)) == POLYNOMIAL_CHREC) + add_multivariate_self_dist (ddr, access_fun); + else + /* The evolution step is not constant: it varies in + the outer loop, so this cannot be represented by a + distance vector. For example in pr34635.c the + evolution is {0, +, {0, +, 4}_1}_2. */ + DDR_AFFINE_P (ddr) = false; + return; } |