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tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for builtin calls even if likelyvalue is not CONSTANT.

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* tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for
	builtin calls even if likelyvalue is not CONSTANT.
	Handle BUILT_IN_STRDUP and BUILT_IN_STRNDUP like BUILT_IN_MALLOC.
	Return get_value_for_expr of first operand
	for BUILT_IN_{MEM{CPY,MOVE,SET},STR{,N}CPY}{,_CHK}.
	* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle
	BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK like
	their non-checking counterparts.
	(call_may_clobber_ref_p_1): Likewise.
	(stmt_kills_ref_p_1): Handle BUILT_IN_MEM{{,P}CPY,MOVE,SET}_CHK
	like their non-checking counterparts.
	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
	Handle BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK
	like their non-checking counterparts.
	(find_func_clobbers): Likewise.
	* tree-ssa-dce.c (propagate_necessity): Handle BUILT_IN_MEMSET_CHK
	like BUILT_IN_MEMSET and BUILT_IN_CALLOC like BUILT_IN_MALLOC.

From-SVN: r175290
This commit is contained in:
Jakub Jelinek 2011-06-22 12:46:36 +02:00 committed by Jakub Jelinek
parent 41cd495729
commit 36dc1a88ff
5 changed files with 99 additions and 3 deletions
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18
gcc/ChangeLog
View File

@ -1,5 +1,23 @@
2011-06-22 Jakub Jelinek <jakub@redhat.com>
* tree-ssa-ccp.c (evaluate_stmt): Try bitwise tracking for
builtin calls even if likelyvalue is not CONSTANT.
Handle BUILT_IN_STRDUP and BUILT_IN_STRNDUP like BUILT_IN_MALLOC.
Return get_value_for_expr of first operand
for BUILT_IN_{MEM{CPY,MOVE,SET},STR{,N}CPY}{,_CHK}.
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle
BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK like
their non-checking counterparts.
(call_may_clobber_ref_p_1): Likewise.
(stmt_kills_ref_p_1): Handle BUILT_IN_MEM{{,P}CPY,MOVE,SET}_CHK
like their non-checking counterparts.
* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
Handle BUILT_IN_{MEM{{,P}CPY,MOVE,SET},STR{,N}C{PY,AT},STPCPY}_CHK
like their non-checking counterparts.
(find_func_clobbers): Likewise.
* tree-ssa-dce.c (propagate_necessity): Handle BUILT_IN_MEMSET_CHK
like BUILT_IN_MEMSET and BUILT_IN_CALLOC like BUILT_IN_MALLOC.
* dwarf2out.c (size_of_loc_descr, output_loc_operands,
mark_base_types, hash_loc_operands, compare_loc_operands): Allow
DW_OP_GNU_convert and DW_OP_GNU_reinterpret to use constant instead

44
gcc/tree-ssa-alias.c
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@ -1,5 +1,5 @@
/* Alias analysis for trees.
Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
@ -1199,6 +1199,24 @@ ref_maybe_used_by_call_p_1 (gimple call, ao_ref *ref)
size);
return refs_may_alias_p_1 (&dref, ref, false);
}
case BUILT_IN_STRCPY_CHK:
case BUILT_IN_STRNCPY_CHK:
case BUILT_IN_MEMCPY_CHK:
case BUILT_IN_MEMMOVE_CHK:
case BUILT_IN_MEMPCPY_CHK:
case BUILT_IN_STPCPY_CHK:
case BUILT_IN_STRCAT_CHK:
case BUILT_IN_STRNCAT_CHK:
{
ao_ref dref;
tree size = NULL_TREE;
if (gimple_call_num_args (call) == 4)
size = gimple_call_arg (call, 2);
ao_ref_init_from_ptr_and_size (&dref,
gimple_call_arg (call, 1),
size);
return refs_may_alias_p_1 (&dref, ref, false);
}
case BUILT_IN_BCOPY:
{
ao_ref dref;
@ -1216,6 +1234,7 @@ ref_maybe_used_by_call_p_1 (gimple call, ao_ref *ref)
case BUILT_IN_STACK_SAVE:
case BUILT_IN_STACK_RESTORE:
case BUILT_IN_MEMSET:
case BUILT_IN_MEMSET_CHK:
case BUILT_IN_FREXP:
case BUILT_IN_FREXPF:
case BUILT_IN_FREXPL:
@ -1453,6 +1472,25 @@ call_may_clobber_ref_p_1 (gimple call, ao_ref *ref)
size);
return refs_may_alias_p_1 (&dref, ref, false);
}
case BUILT_IN_STRCPY_CHK:
case BUILT_IN_STRNCPY_CHK:
case BUILT_IN_MEMCPY_CHK:
case BUILT_IN_MEMMOVE_CHK:
case BUILT_IN_MEMPCPY_CHK:
case BUILT_IN_STPCPY_CHK:
case BUILT_IN_STRCAT_CHK:
case BUILT_IN_STRNCAT_CHK:
case BUILT_IN_MEMSET_CHK:
{
ao_ref dref;
tree size = NULL_TREE;
if (gimple_call_num_args (call) == 4)
size = gimple_call_arg (call, 2);
ao_ref_init_from_ptr_and_size (&dref,
gimple_call_arg (call, 0),
size);
return refs_may_alias_p_1 (&dref, ref, false);
}
case BUILT_IN_BCOPY:
{
ao_ref dref;
@ -1697,6 +1735,10 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref)
case BUILT_IN_MEMPCPY:
case BUILT_IN_MEMMOVE:
case BUILT_IN_MEMSET:
case BUILT_IN_MEMCPY_CHK:
case BUILT_IN_MEMPCPY_CHK:
case BUILT_IN_MEMMOVE_CHK:
case BUILT_IN_MEMSET_CHK:
{
tree dest = gimple_call_arg (stmt, 0);
tree len = gimple_call_arg (stmt, 2);

18
gcc/tree-ssa-ccp.c
View File

@ -1556,7 +1556,7 @@ evaluate_stmt (gimple stmt)
/* Resort to simplification for bitwise tracking. */
if (flag_tree_bit_ccp
&& likelyvalue == CONSTANT
&& (likelyvalue == CONSTANT || is_gimple_call (stmt))
&& !is_constant)
{
enum gimple_code code = gimple_code (stmt);
@ -1616,6 +1616,8 @@ evaluate_stmt (gimple stmt)
case BUILT_IN_MALLOC:
case BUILT_IN_REALLOC:
case BUILT_IN_CALLOC:
case BUILT_IN_STRDUP:
case BUILT_IN_STRNDUP:
val.lattice_val = CONSTANT;
val.value = build_int_cst (TREE_TYPE (gimple_get_lhs (stmt)), 0);
val.mask = shwi_to_double_int
@ -1631,6 +1633,20 @@ evaluate_stmt (gimple stmt)
/ BITS_PER_UNIT - 1));
break;
/* These builtins return their first argument, unmodified. */
case BUILT_IN_MEMCPY:
case BUILT_IN_MEMMOVE:
case BUILT_IN_MEMSET:
case BUILT_IN_STRCPY:
case BUILT_IN_STRNCPY:
case BUILT_IN_MEMCPY_CHK:
case BUILT_IN_MEMMOVE_CHK:
case BUILT_IN_MEMSET_CHK:
case BUILT_IN_STRCPY_CHK:
case BUILT_IN_STRNCPY_CHK:
val = get_value_for_expr (gimple_call_arg (stmt, 0), true);
break;
default:;
}
}

2
gcc/tree-ssa-dce.c
View File

@ -831,7 +831,9 @@ propagate_necessity (struct edge_list *el)
if (callee != NULL_TREE
&& DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL
&& (DECL_FUNCTION_CODE (callee) == BUILT_IN_MEMSET
|| DECL_FUNCTION_CODE (callee) == BUILT_IN_MEMSET_CHK
|| DECL_FUNCTION_CODE (callee) == BUILT_IN_MALLOC
|| DECL_FUNCTION_CODE (callee) == BUILT_IN_CALLOC
|| DECL_FUNCTION_CODE (callee) == BUILT_IN_FREE
|| DECL_FUNCTION_CODE (callee) == BUILT_IN_ALLOCA
|| DECL_FUNCTION_CODE (callee) == BUILT_IN_STACK_SAVE

20
gcc/tree-ssa-structalias.c
View File

@ -1,5 +1,5 @@
/* Tree based points-to analysis
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Daniel Berlin <dberlin@dberlin.org>
@ -3982,6 +3982,14 @@ find_func_aliases_for_builtin_call (gimple t)
case BUILT_IN_STPNCPY:
case BUILT_IN_STRCAT:
case BUILT_IN_STRNCAT:
case BUILT_IN_STRCPY_CHK:
case BUILT_IN_STRNCPY_CHK:
case BUILT_IN_MEMCPY_CHK:
case BUILT_IN_MEMMOVE_CHK:
case BUILT_IN_MEMPCPY_CHK:
case BUILT_IN_STPCPY_CHK:
case BUILT_IN_STRCAT_CHK:
case BUILT_IN_STRNCAT_CHK:
{
tree res = gimple_call_lhs (t);
tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (fndecl)
@ -4011,6 +4019,7 @@ find_func_aliases_for_builtin_call (gimple t)
return true;
}
case BUILT_IN_MEMSET:
case BUILT_IN_MEMSET_CHK:
{
tree res = gimple_call_lhs (t);
tree dest = gimple_call_arg (t, 0);
@ -4627,6 +4636,14 @@ find_func_clobbers (gimple origt)
case BUILT_IN_STPNCPY:
case BUILT_IN_STRCAT:
case BUILT_IN_STRNCAT:
case BUILT_IN_STRCPY_CHK:
case BUILT_IN_STRNCPY_CHK:
case BUILT_IN_MEMCPY_CHK:
case BUILT_IN_MEMMOVE_CHK:
case BUILT_IN_MEMPCPY_CHK:
case BUILT_IN_STPCPY_CHK:
case BUILT_IN_STRCAT_CHK:
case BUILT_IN_STRNCAT_CHK:
{
tree dest = gimple_call_arg (t, (DECL_FUNCTION_CODE (decl)
== BUILT_IN_BCOPY ? 1 : 0));
@ -4649,6 +4666,7 @@ find_func_clobbers (gimple origt)
/* The following function clobbers memory pointed to by
its argument. */
case BUILT_IN_MEMSET:
case BUILT_IN_MEMSET_CHK:
{
tree dest = gimple_call_arg (t, 0);
unsigned i;