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re PR tree-optimization/85822 (Maybe wrong code in VRP since r249150)

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PR tree-optimization/85822

From-SVN: r260566
This commit is contained in:
Yury Gribov 2018-05-23 07:40:43 +00:00 committed by Martin Liska
parent b72feab889
commit ad4f3f5d4e
4 changed files with 44 additions and 5 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-05-23 Yury Gribov <tetra2005@gmail.com>
PR tree-optimization/85822
* tree-vrp.c (is_masked_range_test): Fix handling of negative
constants.
2018-05-23 Richard Biener <rguenther@suse.de>
* tree-ssa-sccvn.c (vn_reference_lookup_3): Handle arbitrary

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2018-05-23 Yury Gribov <tetra2005@gmail.com>
PR tree-optimization/85822
* c-c++-common/pr85822.c: New test.
2018-05-23 Richard Biener <rguenther@suse.de>
* gcc.dg/tree-ssa/ssa-fre-65.c: New testcase.

27
gcc/testsuite/c-c++-common/pr85822.c Normal file
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@ -0,0 +1,27 @@
/* { dg-options "-O2" } */
/* { dg-do run } */
static const long long int TagTypeNumber = 0xffff000000000000ll;
long long int x;
void foo(void)
{
x = TagTypeNumber + 1;
}
int main(int argc, char **argv)
{
if (argc > 0)
foo ();
if ((x & TagTypeNumber) == TagTypeNumber)
{
unsigned y = (unsigned)x;
__builtin_printf ("v: %u\n", y);
if (y != 1)
__builtin_abort ();
}
return 0;
}

11
gcc/tree-vrp.c
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@ -3844,10 +3844,10 @@ register_edge_assert_for_1 (tree op, enum tree_code code,
Such comparison can yield assertions like
X >= XX...X00...0
X <= XX...X11...1
in case of COND_OP being NE_EXPR or
in case of COND_OP being EQ_EXPR or
X < XX...X00...0
X > XX...X11...1
in case of EQ_EXPR. */
in case of NE_EXPR. */
static bool
is_masked_range_test (tree name, tree valt, enum tree_code cond_code,
@ -3867,6 +3867,10 @@ is_masked_range_test (tree name, tree valt, enum tree_code cond_code,
wi::tree_to_wide_ref mask = wi::to_wide (maskt);
wide_int inv_mask = ~mask;
/* Must have been removed by now so don't bother optimizing. */
if (mask == 0 || inv_mask == 0)
return false;
/* Assume VALT is INTEGER_CST. */
wi::tree_to_wide_ref val = wi::to_wide (valt);
@ -3907,9 +3911,6 @@ is_masked_range_test (tree name, tree valt, enum tree_code cond_code,
*low = wide_int_to_tree (type, val);
*high = wide_int_to_tree (type, val | inv_mask);
if (wi::neg_p (val, TYPE_SIGN (type)))
std::swap (*low, *high);
return true;
}