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tree-ssa-alias.c (stmt_kills_ref_p_1): Use ao_ref_init_from_ptr_and_size for builtins.

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2013-11-11  Marc Glisse  <marc.glisse@inria.fr>
	    Jeff Law  <law@redhat.com>

gcc/
	* tree-ssa-alias.c (stmt_kills_ref_p_1): Use
	ao_ref_init_from_ptr_and_size for builtins.

gcc/testsuite/
	* gcc.dg/tree-ssa/alias-27.c: New testcase.

Co-Authored-By: Jeff Law <law@redhat.com>

From-SVN: r204686
This commit is contained in:
Marc Glisse 2013-11-11 21:56:19 +01:00 committed by Marc Glisse
parent 5783ad0ea7
commit 35aacd4cc9
4 changed files with 50 additions and 17 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-11-11 Marc Glisse <marc.glisse@inria.fr>
Jeff Law <law@redhat.com>
* tree-ssa-alias.c (stmt_kills_ref_p_1): Use
ao_ref_init_from_ptr_and_size for builtins.
2013-11-11 Uros Bizjak <ubizjak@gmail.com>
H.J. Lu <hongjiu.lu@intel.com>

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2013-11-11 Marc Glisse <marc.glisse@inria.fr>
Jeff Law <law@redhat.com>
* gcc.dg/tree-ssa/alias-27.c: New testcase.
2013-11-11 Uros Bizjak <ubizjak@gmail.com>
PR target/58853

11
gcc/testsuite/gcc.dg/tree-ssa/alias-27.c Normal file
View File

@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O1 -fdump-tree-optimized" } */
void f (long *p) {
*p = 42;
p[4] = 42;
__builtin_memset (p, 0, 100);
}
/* { dg-final { scan-tree-dump-not "= 42" "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

45
gcc/tree-ssa-alias.c
View File

@ -2008,9 +2008,10 @@ static bool
stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref)
{
/* For a must-alias check we need to be able to constrain
the access properly. */
ao_ref_base (ref);
if (ref->max_size == -1)
the access properly.
FIXME: except for BUILTIN_FREE. */
if (!ao_ref_base (ref)
|| ref->max_size == -1)
return false;
if (gimple_has_lhs (stmt)
@ -2097,23 +2098,33 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref)
{
tree dest = gimple_call_arg (stmt, 0);
tree len = gimple_call_arg (stmt, 2);
tree base = NULL_TREE;
HOST_WIDE_INT offset = 0;
if (!host_integerp (len, 0))
return false;
if (TREE_CODE (dest) == ADDR_EXPR)
base = get_addr_base_and_unit_offset (TREE_OPERAND (dest, 0),
&offset);
else if (TREE_CODE (dest) == SSA_NAME)
base = dest;
if (base
&& base == ao_ref_base (ref))
tree rbase = ref->base;
double_int roffset = double_int::from_shwi (ref->offset);
ao_ref dref;
ao_ref_init_from_ptr_and_size (&dref, dest, len);
tree base = ao_ref_base (&dref);
double_int offset = double_int::from_shwi (dref.offset);
double_int bpu = double_int::from_uhwi (BITS_PER_UNIT);
if (!base || dref.size == -1)
return false;
if (TREE_CODE (base) == MEM_REF)
{
HOST_WIDE_INT size = TREE_INT_CST_LOW (len);
if (offset <= ref->offset / BITS_PER_UNIT
&& (offset + size
>= ((ref->offset + ref->max_size + BITS_PER_UNIT - 1)
/ BITS_PER_UNIT)))
if (TREE_CODE (rbase) != MEM_REF)
return false;
// Compare pointers.
offset += bpu * mem_ref_offset (base);
roffset += bpu * mem_ref_offset (rbase);
base = TREE_OPERAND (base, 0);
rbase = TREE_OPERAND (rbase, 0);
}
if (base == rbase)
{
double_int size = bpu * tree_to_double_int (len);
double_int rsize = double_int::from_uhwi (ref->max_size);
if (offset.sle (roffset)
&& (roffset + rsize).sle (offset + size))
return true;
}
break;