mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-03-26 02:30:30 +08:00
Code Issues Packages Projects Releases Wiki Activity

tree-vrp.c (compare_ranges): Return false for EQ_EXPR if VR0 is less than VR1 or vice-versa.

Browse Source 
2005-11-19  James A. Morrison  <phython@gcc.gnu.org>

        * tree-vrp.c (compare_ranges): Return false for EQ_EXPR if VR0 is less
        than VR1 or vice-versa.

From-SVN: r107243
This commit is contained in:
James A. Morrison 2005-11-20 05:33:00 +00:00
parent b3231ce8af
commit 7ab1122a47
4 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2005-11-19 James A. Morrison <phython@gcc.gnu.org>
* tree-vrp.c (compare_ranges): Return false for EQ_EXPR if VR0 is less
than VR1 or vice-versa.
2005-11-19 Hans-Peter Nilsson <hp@axis.com>
PR middle-end/24912

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2005-11-19 James A. Morrison <phython@gcc.gnu.org>
* gcc.dg/tree-ssa/vrp22.c: New test.
2005-11-19 Hans-Peter Nilsson <hp@axis.com>
PR middle-end/24912

16
gcc/testsuite/gcc.dg/tree-ssa/vrp22.c Normal file
View File

@ -0,0 +1,16 @@
/* { dg-do compile } */
/* { dg-options "-O1 -ftree-vrp -fdump-tree-vrp" } */
extern void link_error ();
void test02(unsigned int a, unsigned int b)
{
unsigned int x = 0x80000000;
if (a > x)
if (b < x)
if (a == b)
link_error ();
}
/* { dg-final { scan-tree-dump-times "link_error" 0 "vrp" } } */
/* { dg-final { cleanup-tree-dump "vrp" } } */

4
gcc/tree-vrp.c
View File

@ -1878,6 +1878,10 @@ compare_ranges (enum tree_code comp, value_range_t *vr0, value_range_t *vr1)
else if (cmp_min != -2 && cmp_max != -2)
return boolean_false_node;
}
/* If [V0_MIN, V1_MAX] < [V1_MIN, V1_MAX] then V0 != V1. */
else if (compare_values (vr0->min, vr1->max) == 1
|| compare_values (vr1->min, vr0->max) == 1)
return boolean_false_node;
return NULL_TREE;
}