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re PR tree-optimization/54547 (FAIL: gcc.dg/tree-ssa/pr37508.c scan-tree-dump-times vrp1 "Folding" 3)

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2012-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/54547
	* tree-vrp.c (set_and_canonicalize_value_range): Handle
	1-bit anti-ranges explicitely.
	(extract_range_from_assert): Properly canonicalize all
	built anti-ranges.

From-SVN: r193888
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Richard Biener 2012-11-28 12:18:39 +00:00 committed by Richard Biener
parent 6625d7bc4c
commit 1001fb60cc
2 changed files with 16 additions and 14 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2012-11-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/54547
* tree-vrp.c (set_and_canonicalize_value_range): Handle
1-bit anti-ranges explicitely.
(extract_range_from_assert): Properly canonicalize all
built anti-ranges.
2012-11-28 Eric Botcazou <ebotcazou@adacore.com>
* stor-layout.c (layout_type) <ARRAY_TYPE>: Do not clear TREE_OVERFLOW

22
gcc/tree-vrp.c
View File

@ -541,22 +541,15 @@ set_and_canonicalize_value_range (value_range_t *vr, enum value_range_type t,
return;
}
else if (TYPE_PRECISION (TREE_TYPE (min)) == 1
&& !TYPE_UNSIGNED (TREE_TYPE (min))
&& (is_min || is_max))
{
/* For signed 1-bit precision, one is not in-range and
thus adding/subtracting it would result in overflows. */
if (operand_equal_p (min, max, 0))
{
min = max = is_min ? vrp_val_max (TREE_TYPE (min))
: vrp_val_min (TREE_TYPE (min));
t = VR_RANGE;
}
/* Non-empty boolean ranges can always be represented
as a singleton range. */
if (is_min)
min = max = vrp_val_max (TREE_TYPE (min));
else
{
set_value_range_to_varying (vr);
return;
}
min = max = vrp_val_min (TREE_TYPE (min));
t = VR_RANGE;
}
else if (is_min
/* As a special exception preserve non-null ranges. */
@ -1707,7 +1700,8 @@ extract_range_from_assert (value_range_t *vr_p, tree expr)
&& vrp_val_is_max (max))
min = max = limit;
set_value_range (vr_p, VR_ANTI_RANGE, min, max, vr_p->equiv);
set_and_canonicalize_value_range (vr_p, VR_ANTI_RANGE,
min, max, vr_p->equiv);
}
else if (cond_code == LE_EXPR || cond_code == LT_EXPR)
{