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re PR tree-optimization/34635 (tree check: expected polynomial_chrec, have integer_cst in add_multivariate_self_dist, at tree-data-ref.c:2813)

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2007-12-19  Sebastian Pop  <sebastian.pop@amd.com>

	PR tree-optimization/34635
	* tree-data-ref.c (add_other_self_distances): Make sure that the
	evolution step is constant.

	* gcc.dg/tree-ssa/pr34635.c: New.
	* gcc.dg/tree-ssa/pr34635-1.c: New.

From-SVN: r131275
This commit is contained in:
Sebastian Pop 2008-01-03 02:38:24 +00:00 committed by Sebastian Pop
parent 8c7cc333be
commit 097392de6b
5 changed files with 53 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-12-19 Sebastian Pop <sebastian.pop@amd.com>
PR tree-optimization/34635
* tree-data-ref.c (add_other_self_distances): Make sure that the
evolution step is constant.
2008-01-03 Jakub Jelinek <jakub@redhat.com>
PR middle-end/34608

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2007-12-19 Sebastian Pop <sebastian.pop@amd.com>
PR tree-optimization/34635
* gcc.dg/tree-ssa/pr34635.c: New.
* gcc.dg/tree-ssa/pr34635-1.c: New.
2008-01-02 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
PR middle-end/34562

14
gcc/testsuite/gcc.dg/tree-ssa/pr34635-1.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O3" } */
void foo(int x[])
{
int i, j;
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
x[i] = x[i+j];
x[i] = x[i+j];
}
}

14
gcc/testsuite/gcc.dg/tree-ssa/pr34635.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O3" } */
void foo(int x[])
{
int i, j;
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
{
x[i] = x[i*j];
x[i] = x[i*j];
}
}

16
gcc/tree-data-ref.c
View File

@ -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;
}