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fold-const.c (fold_unary): Convert (T1)(X op Y) into ((T1)X op (T1)Y)...

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* fold-const.c (fold_unary): Convert (T1)(X op Y) into ((T1)X op (T1)Y),
	for pointer type in more cases than before.

	* gimplify.c (gimplify_expr): Fold (void *)&a + 4.

	* tree-object-size.c (plus_expr_object_size): When operand size is
	unknown, return unknown.

From-SVN: r124403
This commit is contained in:
Jan Hubicka 2007-05-04 02:40:20 +02:00 committed by Jan Hubicka
parent 2c40556556
commit ac5a28a64e
4 changed files with 39 additions and 16 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2007-05-03 Jan Hubicka <jh@suse.cz>
* fold-const.c (fold_unary): Convert (T1)(X op Y) into ((T1)X op (T1)Y),
for pointer type in more cases than before.
* gimplify.c (gimplify_expr): Fold (void *)&a + 4.
* tree-object-size.c (plus_expr_object_size): When operand size is
unknown, return unknown.
2007-05-03 Dirk Mueller <dmueller@suse.de>
* doc/invoke.texi (-m386,-m486,-mpentium,-mpentiumpro): Remove.

24
gcc/fold-const.c
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@ -7814,24 +7814,20 @@ fold_unary (enum tree_code code, tree type, tree op0)
}
}
/* Convert (T1)((T2)X op Y) into (T1)X op Y, for pointer types T1 and
T2 being pointers to types of the same size. */
if (POINTER_TYPE_P (type)
/* Convert (T1)(X op Y) into ((T1)X op (T1)Y), for pointer type,
when one of the new casts will fold away. Conservatively we assume
that this happens when X or Y is NOP_EXPR or Y is INTEGER_CST. */
if (POINTER_TYPE_P (type) && POINTER_TYPE_P (TREE_TYPE (arg0))
&& BINARY_CLASS_P (arg0)
&& TREE_CODE (TREE_OPERAND (arg0, 0)) == NOP_EXPR
&& POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg0, 0))))
&& (TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST
|| TREE_CODE (TREE_OPERAND (arg0, 0)) == NOP_EXPR
|| TREE_CODE (TREE_OPERAND (arg0, 1)) == NOP_EXPR))
{
tree arg00 = TREE_OPERAND (arg0, 0);
tree t0 = type;
tree t1 = TREE_TYPE (arg00);
tree tt0 = TREE_TYPE (t0);
tree tt1 = TREE_TYPE (t1);
tree s0 = TYPE_SIZE (tt0);
tree s1 = TYPE_SIZE (tt1);
tree arg01 = TREE_OPERAND (arg0, 1);
if (s0 && s1 && operand_equal_p (s0, s1, OEP_ONLY_CONST))
return build2 (TREE_CODE (arg0), t0, fold_convert (t0, arg00),
TREE_OPERAND (arg0, 1));
return fold_build2 (TREE_CODE (arg0), type, fold_convert (type, arg00),
fold_convert (type, arg01));
}
/* Convert (T1)(~(T2)X) into ~(T1)X if T1 and T2 are integral types

17
gcc/gimplify.c
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@ -5881,7 +5881,22 @@ gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p,
{
*expr_p = build_fold_addr_expr_with_type (tmp,
TREE_TYPE (*expr_p));
break;
break;
}
/* Convert (void *)&a + 4 into (void *)&a[1]. */
if (POINTER_TYPE_P (TREE_TYPE (*expr_p))
&& TREE_CODE (TREE_OPERAND (*expr_p, 0)) == NOP_EXPR
&& TREE_CODE (TREE_OPERAND (*expr_p, 1)) == INTEGER_CST
&& (tmp = maybe_fold_offset_to_reference
(TREE_OPERAND (TREE_OPERAND (*expr_p, 0), 0),
TREE_OPERAND (*expr_p, 1),
TREE_TYPE (TREE_TYPE
(TREE_OPERAND (TREE_OPERAND (*expr_p, 0),
0))))))
{
tmp = build_fold_addr_expr (tmp);
*expr_p = fold_convert (TREE_TYPE (*expr_p), tmp);
break;
}
/* FALLTHRU */
default:

4
gcc/tree-object-size.c
View File

@ -588,7 +588,9 @@ plus_expr_object_size (struct object_size_info *osi, tree var, tree value)
unsigned HOST_WIDE_INT off = tree_low_cst (op1, 1);
bytes = compute_builtin_object_size (op0, object_size_type);
if (off > offset_limit)
if (bytes == unknown[object_size_type])
;
else if (off > offset_limit)
bytes = unknown[object_size_type];
else if (off > bytes)
bytes = 0;