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re PR tree-optimization/71824 (ICE when compiling libiberty with Graphite loop optimizations)

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2017-02-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71824
	* graphite-scop-detection.c (scop_detection::build_scop_breadth):
	Verify the loops are valid in the merged SESE region.
	(scop_detection::can_represent_loop_1): Check analyzing the
	evolution of the number of iterations in the region succeeds.

	* gcc.dg/graphite/pr71824.c: New testcase.

From-SVN: r245081
This commit is contained in:
Richard Biener 2017-02-01 08:02:50 +00:00 committed by Richard Biener
parent 315405b669
commit 405a740640
4 changed files with 35 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2017-02-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/71824
* graphite-scop-detection.c (scop_detection::build_scop_breadth):
Verify the loops are valid in the merged SESE region.
(scop_detection::can_represent_loop_1): Check analyzing the
evolution of the number of iterations in the region succeeds.
2017-01-31 Ian Lance Taylor <iant@golang.org>
* config/i386/i386.c (ix86_expand_split_stack_prologue): Add

6
gcc/graphite-scop-detection.c
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@ -905,7 +905,9 @@ scop_detection::build_scop_breadth (sese_l s1, loop_p loop)
sese_l combined = merge_sese (s1, s2);
if (combined)
if (combined
&& loop_is_valid_in_scop (loop, combined)
&& loop_is_valid_in_scop (loop->next, combined))
s1 = combined;
else
add_scop (s2);
@ -931,6 +933,8 @@ scop_detection::can_represent_loop_1 (loop_p loop, sese_l scop)
&& niter_desc.control.no_overflow
&& (niter = number_of_latch_executions (loop))
&& !chrec_contains_undetermined (niter)
&& !chrec_contains_undetermined (scalar_evolution_in_region (scop,
loop, niter))
&& graphite_can_represent_expr (scop, loop, niter);
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-02-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/71824
* gcc.dg/graphite/pr71824.c: New testcase.
2017-01-31 Jakub Jelinek <jakub@redhat.com>
PR c++/79304

17
gcc/testsuite/gcc.dg/graphite/pr71824.c Normal file
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@ -0,0 +1,17 @@
/* { dg-do compile } */
/* { dg-options "-O2 -floop-nest-optimize" } */
int a, b, d;
int **c;
int fn1() {
while (a)
if (d) {
int e = -d;
for (; b < e; b++)
c[b] = &a;
} else {
for (; b; b++)
c[b] = &b;
d = 0;
}
}