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re PR tree-optimization/23603 (VRP does not say range for a in a = b == c; is [0,1]) 

2007-01-08  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/23603
        * tree-vrp.c (set_value_range_to_truthvalue): New function.
        (extract_range_from_binary): Fall back to truthvalue instead of
        varying for TRUTH_*_EXPR.
        (extract_range_from_comparison): Fall back to truthvalue instead of
        varying.
        (vrp_visit_phi_node): Don't adjust new range bounds to +INF/-INF
        if all visited PHI values were constant.

        * gcc.dg/tree-ssa/vrp31.c: New testcase.
        * gcc.dg/tree-ssa/vrp32.c: Likewise.

From-SVN: r120578
This commit is contained in:
Richard Guenther 2007-01-08 11:20:00 +00:00 committed by Richard Biener
parent 151e6f2437
commit 31ab1cc9db
5 changed files with 70 additions and 4 deletions
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11
gcc/ChangeLog
View File

@ -1,3 +1,14 @@
2007-01-08 Richard Guenther <rguenther@suse.de>
PR tree-optimization/23603
* tree-vrp.c (set_value_range_to_truthvalue): New function.
(extract_range_from_binary): Fall back to truthvalue instead of
varying for TRUTH_*_EXPR.
(extract_range_from_comparison): Fall back to truthvalue instead of
varying.
(vrp_visit_phi_node): Don't adjust new range bounds to +INF/-INF
if all visited PHI values were constant.
2007-01-08 Jan Hubicka <jh@suse.cz>
* cgraphunit.c (cgraph_process_new_functions): Reset reachable flag.

6
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,9 @@
2007-01-08 Richard Guenther <rguenther@suse.de>
PR tree-optimization/23603
* gcc.dg/tree-ssa/vrp31.c: New testcase.
* gcc.dg/tree-ssa/vrp32.c: Likewise.
2007-01-08 Mark Shinwell <shinwell@codesourcery.com>
* gcc.target/i386/20020531-1.c: Use "char" not "unsigned char"

14
gcc/testsuite/gcc.dg/tree-ssa/vrp31.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1" } */
int f(int i)
{
int t = i == 1;
int g = t == 2;
int h = g == 3;
return h;
}
/* { dg-final { scan-tree-dump "return 0;" "vrp1" } } */
/* { dg-final { cleanup-tree-dump "vrp1" } } */

14
gcc/testsuite/gcc.dg/tree-ssa/vrp32.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1" } */
int f(int i)
{
_Bool t = !i;
int g = !t && i;
int h = g == 3;
return h;
}
/* { dg-final { scan-tree-dump "return 0;" "vrp1" } } */
/* { dg-final { cleanup-tree-dump "vrp1" } } */

29
gcc/tree-vrp.c
View File

@ -236,6 +236,20 @@ set_value_range_to_varying (value_range_t *vr)
}
/* Set value range VR to a range of a truthvalue of type TYPE. */
static inline void
set_value_range_to_truthvalue (value_range_t *vr, tree type)
{
if (TYPE_PRECISION (type) == 1)
set_value_range_to_varying (vr);
else
set_value_range (vr, VR_RANGE,
build_int_cst (type, 0), build_int_cst (type, 1),
vr->equiv);
}
/* Set value range VR to VR_UNDEFINED. */
static inline void
@ -1439,7 +1453,8 @@ extract_range_from_binary_expr (value_range_t *vr, tree expr)
}
else
{
set_value_range_to_varying (vr);
/* The result of a TRUTH_*_EXPR is always true or false. */
set_value_range_to_truthvalue (vr, TREE_TYPE (expr));
return;
}
}
@ -1920,7 +1935,8 @@ extract_range_from_comparison (value_range_t *vr, tree expr)
set_value_range (vr, VR_RANGE, val, val, vr->equiv);
}
else
set_value_range_to_varying (vr);
/* The result of a comparison is always true or false. */
set_value_range_to_truthvalue (vr, TREE_TYPE (expr));
}
@ -4182,6 +4198,7 @@ vrp_visit_phi_node (tree phi)
tree lhs = PHI_RESULT (phi);
value_range_t *lhs_vr = get_value_range (lhs);
value_range_t vr_result = { VR_UNDEFINED, NULL_TREE, NULL_TREE, NULL };
bool all_const = true;
copy_value_range (&vr_result, lhs_vr);
@ -4209,7 +4226,10 @@ vrp_visit_phi_node (tree phi)
value_range_t vr_arg;
if (TREE_CODE (arg) == SSA_NAME)
vr_arg = *(get_value_range (arg));
{
vr_arg = *(get_value_range (arg));
all_const = false;
}
else
{
vr_arg.type = VR_RANGE;
@ -4240,7 +4260,8 @@ 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 && vr_result.type == VR_RANGE)
if (lhs_vr->type == VR_RANGE && vr_result.type == VR_RANGE
&& !all_const)
{
if (!POINTER_TYPE_P (TREE_TYPE (lhs)))
{