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re PR middle-end/40281 (-fprefetch-loop-arrays: ICE: in initialize_matrix_A, at tree-data-ref.c:1887)

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2009-11-18  Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/40281
	* testsuite/gcc.dg/graphite/pr40281.c: New.

	* tree-scalar-evolution.c (instantiate_scev_poly): Base and stride
	evolutions should not variate in inner loops.

From-SVN: r154641
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Sebastian Pop 2009-11-25 05:35:58 +00:00 committed by Sebastian Pop
parent 12aec7316d
commit 4bf4e16939
2 changed files with 21 additions and 1 deletions
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8
gcc/ChangeLog.graphite
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@ -1,3 +1,11 @@
2009-11-18 Sebastian Pop <sebastian.pop@amd.com>
PR middle-end/40281
* testsuite/gcc.dg/graphite/pr40281.c: New.
* tree-scalar-evolution.c (instantiate_scev_poly): Base and stride
evolutions should not variate in inner loops.
2009-11-18 Sebastian Pop <sebastian.pop@amd.com>
PR middle-end/42050

14
gcc/tree-scalar-evolution.c
View File

@ -2226,9 +2226,21 @@ instantiate_scev_poly (basic_block instantiate_below,
if (CHREC_LEFT (chrec) != op0
|| CHREC_RIGHT (chrec) != op1)
{
unsigned var = CHREC_VARIABLE (chrec);
/* When the instantiated stride or base has an evolution in an
innermost loop, return chrec_dont_know, as this is not a
valid SCEV representation. In the reduced testcase for
PR40281 we would have {0, +, {1, +, 1}_2}_1 that has no
meaning. */
if ((tree_is_chrec (op0) && CHREC_VARIABLE (op0) > var)
|| (tree_is_chrec (op1) && CHREC_VARIABLE (op1) > var))
return chrec_dont_know;
op1 = chrec_convert_rhs (chrec_type (op0), op1, NULL);
chrec = build_polynomial_chrec (CHREC_VARIABLE (chrec), op0, op1);
chrec = build_polynomial_chrec (var, op0, op1);
}
return chrec;
}