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re PR tree-optimization/43627 (slow compilation (tree canonical iv takes 75%))

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2010-04-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/43627
	* tree-vrp.c (extract_range_from_unary_expr): Widenings
	of [1, +INF(OVF)] go to [1, +INF(OVF)] of the wider type,
	not varying.

	* gcc.dg/tree-ssa/vrp49.c: New testcase.

From-SVN: r157992
This commit is contained in:
Richard Guenther 2010-04-06 12:32:25 +00:00 • committed by Richard Biener
parent d3bccded30
commit 56186ac266
4 changed files with 54 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2010-04-06 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43627
* tree-vrp.c (extract_range_from_unary_expr): Widenings
of [1, +INF(OVF)] go to [1, +INF(OVF)] of the wider type,
not varying.
2010-04-06 Jakub Jelinek <jakub@redhat.com>
* BASE-VER: Change to 4.6.0.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-04-06 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43627
* gcc.dg/tree-ssa/vrp49.c: New testcase.
2010-04-06 Jakub Jelinek <jakub@redhat.com>
PR target/43638

28
gcc/testsuite/gcc.dg/tree-ssa/vrp49.c Normal file
View file

@ -0,0 +1,28 @@
/* { dg-do link } */
/* { dg-options "-O2" } */
extern void link_error (void) __attribute__((noreturn));
int n;
float *x;
int main()
{
if (n > 0)
{
int i = 0;
do
{
long long index;
i = i + 1;
index = i;
if (index <= 0)
link_error ();
x[index] = 0;
i = i + 1;
index = i;
if (index <= 0)
link_error ();
x[index] = 0;
}
while (i < n);
}
}

16
gcc/tree-vrp.c
View file

@ -2715,8 +2715,16 @@ extract_range_from_unary_expr (value_range_t *vr, enum tree_code code,
|| vr0.type == VR_ANTI_RANGE)
&& TREE_CODE (vr0.min) == INTEGER_CST
&& TREE_CODE (vr0.max) == INTEGER_CST
&& !is_overflow_infinity (vr0.min)
&& !is_overflow_infinity (vr0.max)
&& (!is_overflow_infinity (vr0.min)
|| (vr0.type == VR_RANGE
&& TYPE_PRECISION (outer_type) > TYPE_PRECISION (inner_type)
&& needs_overflow_infinity (outer_type)
&& supports_overflow_infinity (outer_type)))
&& (!is_overflow_infinity (vr0.max)
|| (vr0.type == VR_RANGE
&& TYPE_PRECISION (outer_type) > TYPE_PRECISION (inner_type)
&& needs_overflow_infinity (outer_type)
&& supports_overflow_infinity (outer_type)))
&& (TYPE_PRECISION (outer_type) >= TYPE_PRECISION (inner_type)
|| (vr0.type == VR_RANGE
&& integer_zerop (int_const_binop (RSHIFT_EXPR,
@ -2730,6 +2738,10 @@ extract_range_from_unary_expr (value_range_t *vr, enum tree_code code,
new_max = force_fit_type_double (outer_type,
TREE_INT_CST_LOW (vr0.max),
TREE_INT_CST_HIGH (vr0.max), 0, 0);
if (is_overflow_infinity (vr0.min))
new_min = negative_overflow_infinity (outer_type);
if (is_overflow_infinity (vr0.max))
new_max = positive_overflow_infinity (outer_type);
set_and_canonicalize_value_range (vr, vr0.type,
new_min, new_max, NULL);
return;