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fold-const.c (force_fit_type): Unsigned values can overflow if they are sizetype.

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* fold-const.c (force_fit_type): Unsigned values can overflow
	if they are sizetype.
	(int_const_binop): Don't use cache if overflows.
	* cp/typeck.c (dubious_conversion_warning): Suppress if
	TYPE_IS_SIZETYPE.

From-SVN: r36970
This commit is contained in:
Richard Kenner 2000-10-20 17:51:52 +00:00 committed by Richard Kenner
parent 23ccfa6dbb
commit 4447513857
4 changed files with 26 additions and 4 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
Fri Oct 20 13:33:16 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* fold-const.c (force_fit_type): Unsigned values can overflow
if they are sizetype.
(int_const_binop): Don't use cache if overflows.
2000-10-20 Richard Henderson <rth@cygnus.com>
* function.c (locate_and_pad_parm): Zero alignment_pad.

4
gcc/cp/ChangeLog
View File

@ -1,3 +1,7 @@
Fri Oct 20 13:54:59 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* typeck.c (dubious_conversion_warning): Suppress if TYPE_IS_SIZETYPE.
2000-10-20 Jeffrey Oldham <oldham@codesourcery.com>
* decl.c (revert_static_member_fn): Fixed typo.

11
gcc/cp/typeck.c
View File

@ -6353,7 +6353,16 @@ dubious_conversion_warnings (type, expr, errtype, fndecl, parmnum)
cp_warning ("%s of negative value `%E' to `%T'",
errtype, expr, type);
}
overflow_warning (expr);
/* Suppress warning for a sizetype since we never used to issue it.
??? This needs to be looked at more carefully someday. */
if (TREE_CODE (expr) == INTEGER_CST
&& TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
&& TYPE_IS_SIZETYPE (TREE_TYPE (expr)))
TREE_OVERFLOW (expr) = TREE_CONSTANT_OVERFLOW (expr) = 0;
else
overflow_warning (expr);
if (TREE_CONSTANT (expr))
expr = fold (expr);
}

10
gcc/fold-const.c
View File

@ -216,8 +216,11 @@ force_fit_type (t, overflow)
TREE_INT_CST_LOW (t) &= ~((unsigned HOST_WIDE_INT) (-1) << prec);
}
/* Unsigned types do not suffer sign extension or overflow. */
if (TREE_UNSIGNED (TREE_TYPE (t)))
/* Unsigned types do not suffer sign extension or overflow unless they
are a sizetype. */
if (TREE_UNSIGNED (TREE_TYPE (t))
&& ! (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
&& TYPE_IS_SIZETYPE (TREE_TYPE (t))))
return overflow;
/* If the value's sign bit is set, extend the sign. */
@ -1604,7 +1607,8 @@ int_const_binop (code, arg1, arg2, notrunc, forsize)
abort ();
}
if (forsize && hi == 0 && low < 10000)
if (forsize && hi == 0 && low < 10000
&& overflow == 0 && ! TREE_OVERFLOW (arg1) && ! TREE_OVERFLOW (arg2))
return size_int_type_wide (low, TREE_TYPE (arg1));
else
{