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tree-data-ref.c (add_multivariate_self_dist): Force the distance vector to be positive. 

* tree-data-ref.c (add_multivariate_self_dist): Force the distance
	vector to be positive.

From-SVN: r123720
This commit is contained in:
Zdenek Dvorak 2007-04-11 18:45:47 +02:00 committed by Zdenek Dvorak
parent e9e0aa2c96
commit 0ca2faee4f
2 changed files with 20 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-04-10 Zdenek Dvorak <dvorakz@suse.cz>
* tree-data-ref.c (add_multivariate_self_dist): Force the distance
vector to be positive.
2007-04-11 Diego Novillo <dnovillo@redhat.com>
PR 30735

17
gcc/tree-data-ref.c
View File

@ -3857,6 +3857,7 @@ add_multivariate_self_dist (struct data_dependence_relation *ddr, tree c_2)
tree c_1 = CHREC_LEFT (c_2);
tree c_0 = CHREC_LEFT (c_1);
lambda_vector dist_v;
int v1, v2, cd;
/* Polynomials with more than 2 variables are not handled yet. */
if (TREE_CODE (c_0) != INTEGER_CST)
@ -3870,8 +3871,20 @@ add_multivariate_self_dist (struct data_dependence_relation *ddr, tree c_2)
/* For "{{0, +, 2}_1, +, 3}_2" the distance vector is (3, -2). */
dist_v = lambda_vector_new (DDR_NB_LOOPS (ddr));
dist_v[x_1] = int_cst_value (CHREC_RIGHT (c_2));
dist_v[x_2] = -int_cst_value (CHREC_RIGHT (c_1));
v1 = int_cst_value (CHREC_RIGHT (c_1));
v2 = int_cst_value (CHREC_RIGHT (c_2));
cd = gcd (v1, v2);
v1 /= cd;
v2 /= cd;
if (v2 < 0)
{
v2 = -v2;
v1 = -v1;
}
dist_v[x_1] = v2;
dist_v[x_2] = -v1;
save_dist_v (ddr, dist_v);
add_outer_distances (ddr, dist_v, x_1);