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re PR tree-optimization/23141 (ACATS FAIL c45651a fixed point wrong code)

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PR 23141
	PR 23142
	* tree-vrp.c (vrp_meet): Fix the intersection of equivalence
	sets VR0->EQUIV and VR1->EQUIV when meeting a range and an
	anti-range.
	(vrp_visit_phi_node): Only prevent infinite iterations when
	the previous result and the new result are both VR_RANGEs.

From-SVN: r105436
This commit is contained in:
Diego Novillo 2005-10-15 14:30:36 +00:00 committed by Diego Novillo
parent 7b71de2644
commit 2d33a2effd
2 changed files with 15 additions and 2 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2005-10-15 Diego Novillo <dnovillo@redhat.com>
PR 23141
PR 23142
* tree-vrp.c (vrp_meet): Fix the intersection of equivalence
sets VR0->EQUIV and VR1->EQUIV when meeting a range and an
anti-range.
(vrp_visit_phi_node): Only prevent infinite iterations when
the previous result and the new result are both VR_RANGEs.
2005-10-15 Ranjit Mathew <rmathew@gcc.gnu.org>
* tree-into-ssa.c (mark_def_sites): Correct minor typo in

7
gcc/tree-vrp.c
View File

@ -3497,8 +3497,11 @@ vrp_meet (value_range_t *vr0, value_range_t *vr1)
&& !symbolic_range_p (vr1)
&& !value_ranges_intersect_p (vr0, vr1))
{
/* Copy most of VR1 into VR0. Don't copy VR1's equivalence
set. We need to compute the intersection of the two
equivalence sets. */
if (vr1->type == VR_ANTI_RANGE)
copy_value_range (vr0, vr1);
set_value_range (vr0, vr1->type, vr1->min, vr1->max, vr0->equiv);
/* The resulting set of equivalences is the intersection of
the two sets. */
@ -3609,7 +3612,7 @@ vrp_visit_phi_node (tree phi)
/* To prevent infinite iterations in the algorithm, derive ranges
when the new value is slightly bigger or smaller than the
previous one. */
if (lhs_vr->type == VR_RANGE)
if (lhs_vr->type == VR_RANGE && vr_result.type == VR_RANGE)
{
if (!POINTER_TYPE_P (TREE_TYPE (lhs)))
{