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re PR middle-end/38934 (ICE in set_value_range, at tree-vrp.c:398) 

PR middle-end/38934
	* tree-vrp.c (extract_range_from_assert): For LE_EXPR and LT_EXPR
	set to varying whenever max has TREE_OVERFLOW set, similarly
	for GE_EXPR and GT_EXPR and TREE_OVERFLOW min.

	* gcc.dg/pr38934.c: New test.

From-SVN: r143723
This commit is contained in:
Jakub Jelinek 2009-01-28 11:40:06 +01:00 committed by Jakub Jelinek
parent 97a170cd63
commit a9d386a14f
4 changed files with 33 additions and 2 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2009-01-28 Jakub Jelinek <jakub@redhat.com>
PR middle-end/38934
* tree-vrp.c (extract_range_from_assert): For LE_EXPR and LT_EXPR
set to varying whenever max has TREE_OVERFLOW set, similarly
for GE_EXPR and GT_EXPR and TREE_OVERFLOW min.
2009-01-28 Richard Guenther <rguenther@suse.de>
PR middle-end/38908

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2009-01-28 Jakub Jelinek <jakub@redhat.com>
PR middle-end/38934
* gcc.dg/pr38934.c: New test.
2009-01-28 Richard Guenther <rguenther@suse.de>
PR middle-end/38908

19
gcc/testsuite/gcc.dg/pr38934.c Normal file
View File

@ -0,0 +1,19 @@
/* PR middle-end/38934 */
/* { dg-do compile } */
/* { dg-options "-O2 -std=gnu99 -w" } */
/* This variable needed only to work around earlier optimizations than VRP. */
unsigned char g;
extern void abort ();
void
f (long long int p)
{
g = 255;
if (p >= -9223372036854775808LL - (signed char) g)
p = 1;
if (p)
abort ();
}

4
gcc/tree-vrp.c
View File

@ -1620,7 +1620,7 @@ extract_range_from_assert (value_range_t *vr_p, tree expr)
all should be optimized away above us. */
if ((cond_code == LT_EXPR
&& compare_values (max, min) == 0)
|| is_overflow_infinity (max))
|| (CONSTANT_CLASS_P (max) && TREE_OVERFLOW (max)))
set_value_range_to_varying (vr_p);
else
{
@ -1655,7 +1655,7 @@ extract_range_from_assert (value_range_t *vr_p, tree expr)
all should be optimized away above us. */
if ((cond_code == GT_EXPR
&& compare_values (min, max) == 0)
|| is_overflow_infinity (min))
|| (CONSTANT_CLASS_P (min) && TREE_OVERFLOW (min)))
set_value_range_to_varying (vr_p);
else
{