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tree-ssa-alias.h (ranges_overlap_p): Handle negative offsets.

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2013-11-05  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* tree-ssa-alias.h (ranges_overlap_p): Handle negative offsets.
	* tree-ssa-alias.c (ao_ref_init_from_ptr_and_size): Likewise.

gcc/testsuite/
	* gcc.dg/tree-ssa/alias-26.c: New file.

From-SVN: r204388
This commit is contained in:
Marc Glisse 2013-11-05 13:38:00 +01:00 committed by Marc Glisse
parent 3ff2ca23dc
commit 75081240d0
5 changed files with 30 additions and 8 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
* tree-ssa-alias.h (ranges_overlap_p): Handle negative offsets.
* tree-ssa-alias.c (ao_ref_init_from_ptr_and_size): Likewise.
2013-11-05 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/58984

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2013-11-05 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/alias-26.c: New file.
2013-11-05 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/58984

13
gcc/testsuite/gcc.dg/tree-ssa/alias-26.c Normal file
View File

@ -0,0 +1,13 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
void f (const char *c, int *i)
{
*i = 42;
__builtin_memcpy (i - 1, c, sizeof (int));
if (*i != 42) __builtin_abort();
}
/* { dg-final { scan-tree-dump-not "abort" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

8
gcc/tree-ssa-alias.c
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@ -559,7 +559,7 @@ ao_ref_alias_set (ao_ref *ref)
}
/* Init an alias-oracle reference representation from a gimple pointer
PTR and a gimple size SIZE in bytes. If SIZE is NULL_TREE the the
PTR and a gimple size SIZE in bytes. If SIZE is NULL_TREE then the
size is assumed to be unknown. The access is assumed to be only
to or after of the pointer target, not before it. */
@ -576,11 +576,11 @@ ao_ref_init_from_ptr_and_size (ao_ref *ref, tree ptr, tree size)
ptr = gimple_assign_rhs1 (stmt);
else if (is_gimple_assign (stmt)
&& gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR
&& host_integerp (gimple_assign_rhs2 (stmt), 0)
&& (t1 = int_cst_value (gimple_assign_rhs2 (stmt))) >= 0)
&& TREE_CODE (gimple_assign_rhs2 (stmt)) == INTEGER_CST)
{
ptr = gimple_assign_rhs1 (stmt);
extra_offset = BITS_PER_UNIT * t1;
extra_offset = BITS_PER_UNIT
* int_cst_value (gimple_assign_rhs2 (stmt));
}
}

8
gcc/tree-ssa-alias.h
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@ -146,18 +146,18 @@ extern GTY(()) struct pt_solution ipa_escaped_pt;
range is open-ended. Otherwise return false. */
static inline bool
ranges_overlap_p (unsigned HOST_WIDE_INT pos1,
ranges_overlap_p (HOST_WIDE_INT pos1,
unsigned HOST_WIDE_INT size1,
unsigned HOST_WIDE_INT pos2,
HOST_WIDE_INT pos2,
unsigned HOST_WIDE_INT size2)
{
if (pos1 >= pos2
&& (size2 == (unsigned HOST_WIDE_INT)-1
|| pos1 < (pos2 + size2)))
|| pos1 < (pos2 + (HOST_WIDE_INT) size2)))
return true;
if (pos2 >= pos1
&& (size1 == (unsigned HOST_WIDE_INT)-1
|| pos2 < (pos1 + size1)))
|| pos2 < (pos1 + (HOST_WIDE_INT) size1)))
return true;
return false;