-/* Utility routines for data type conversion for GNU C.
- Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997,
- 1998 Free Software Foundation, Inc.
+/* Utility routines for data type conversion for GCC.
+ Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
+ 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GCC.
in other cases error is called. */
tree
-convert_to_pointer (type, expr)
- tree type, expr;
+convert_to_pointer (tree type, tree expr)
{
if (integer_zerop (expr))
{
/* Avoid any floating point extensions from EXP. */
tree
-strip_float_extensions (exp)
- tree exp;
+strip_float_extensions (tree exp)
{
tree sub, expt, subt;
in other cases error is called. */
tree
-convert_to_real (type, expr)
- tree type, expr;
+convert_to_real (tree type, tree expr)
{
enum built_in_function fcode = builtin_mathfn_code (expr);
tree itype = TREE_TYPE (expr);
/* Disable until we figure out how to decide whether the functions are
present in runtime. */
/* Convert (float)sqrt((double)x) where x is float into sqrtf(x) */
- if ((fcode == BUILT_IN_SQRT
- || fcode == BUILT_IN_SQRTL
- || fcode == BUILT_IN_SIN
- || fcode == BUILT_IN_SINL
- || fcode == BUILT_IN_COS
- || fcode == BUILT_IN_COSL
- || fcode == BUILT_IN_EXP
- || fcode == BUILT_IN_EXPL)
- && optimize
+ if (optimize
+ && (fcode == BUILT_IN_SQRT
+ || fcode == BUILT_IN_SQRTL
+ || fcode == BUILT_IN_SIN
+ || fcode == BUILT_IN_SINL
+ || fcode == BUILT_IN_COS
+ || fcode == BUILT_IN_COSL
+ || fcode == BUILT_IN_EXP
+ || fcode == BUILT_IN_EXPL
+ || fcode == BUILT_IN_LOG
+ || fcode == BUILT_IN_LOGL)
&& (TYPE_MODE (type) == TYPE_MODE (double_type_node)
|| TYPE_MODE (type) == TYPE_MODE (float_type_node)))
{
if (TYPE_PRECISION (TREE_TYPE (arg0)) > TYPE_PRECISION (type))
newtype = TREE_TYPE (arg0);
- /* Be curefull about integer to fp conversions.
+ /* Be careful about integer to fp conversions.
These may overflow still. */
if (FLOAT_TYPE_P (TREE_TYPE (arg0))
&& TYPE_PRECISION (newtype) < TYPE_PRECISION (itype)
if (fn)
{
tree arg0 = strip_float_extensions (TREE_VALUE (TREE_OPERAND (expr,
- 1)));
+ 1)));
tree arglist = build_tree_list (NULL_TREE,
- fold (convert_to_real (type, arg0)));
+ fold (convert_to_real (type, arg0)));
return build_function_call_expr (fn, arglist);
}
if (itype != type && FLOAT_TYPE_P (type))
switch (TREE_CODE (expr))
{
- /* convert (float)-x into -(float)x. This is always safe. */
+ /* Convert (float)-x into -(float)x. This is always safe. */
case ABS_EXPR:
case NEGATE_EXPR:
if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
fold (convert_to_real (type,
TREE_OPERAND (expr, 0))));
break;
- /* convert (outertype)((innertype0)a+(innertype1)b)
+ /* Convert (outertype)((innertype0)a+(innertype1)b)
into ((newtype)a+(newtype)b) where newtype
is the widest mode from all of these. */
case PLUS_EXPR:
not in use in any existing structure. */
tree
-convert_to_integer (type, expr)
- tree type, expr;
+convert_to_integer (tree type, tree expr)
{
enum tree_code ex_form = TREE_CODE (expr);
tree intype = TREE_TYPE (expr);
if (TREE_CODE_CLASS (ex_form) == '<')
{
+ expr = copy_node (expr);
TREE_TYPE (expr) = type;
return expr;
}
|| ex_form == TRUTH_OR_EXPR || ex_form == TRUTH_ORIF_EXPR
|| ex_form == TRUTH_XOR_EXPR)
{
+ expr = copy_node (expr);
TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0));
TREE_OPERAND (expr, 1) = convert (type, TREE_OPERAND (expr, 1));
TREE_TYPE (expr) = type;
else if (ex_form == TRUTH_NOT_EXPR)
{
+ expr = copy_node (expr);
TREE_OPERAND (expr, 0) = convert (type, TREE_OPERAND (expr, 0));
TREE_TYPE (expr) = type;
return expr;
we are truncating EXPR. */
else if (outprec >= inprec)
- return build1 (NOP_EXPR, type, expr);
+ {
+ enum tree_code code;
+
+ /* If the precision of the EXPR's type is K bits and the
+ destination mode has more bits, and the sign is changing,
+ it is not safe to use a NOP_EXPR. For example, suppose
+ that EXPR's type is a 3-bit unsigned integer type, the
+ TYPE is a 3-bit signed integer type, and the machine mode
+ for the types is 8-bit QImode. In that case, the
+ conversion necessitates an explicit sign-extension. In
+ the signed-to-unsigned case the high-order bits have to
+ be cleared. */
+ if (TREE_UNSIGNED (type) != TREE_UNSIGNED (TREE_TYPE (expr))
+ && (TYPE_PRECISION (TREE_TYPE (expr))
+ != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)))))
+ code = CONVERT_EXPR;
+ else
+ code = NOP_EXPR;
+
+ return build1 (code, type, expr);
+ }
/* If TYPE is an enumeral type or a type with a precision less
than the number of bits in its mode, do the conversion to the
case BIT_AND_EXPR:
case BIT_IOR_EXPR:
case BIT_XOR_EXPR:
- case BIT_ANDTC_EXPR:
trunc1:
{
tree arg0 = get_unwidened (TREE_OPERAND (expr, 0), type);
/* Don't do unsigned arithmetic where signed was wanted,
or vice versa.
Exception: if both of the original operands were
- unsigned then we can safely do the work as unsigned.
+ unsigned then we can safely do the work as unsigned.
Exception: shift operations take their type solely
from the first argument.
Exception: the LSHIFT_EXPR case above requires that
/* It is sometimes worthwhile to push the narrowing down through
the conditional and never loses. */
return fold (build (COND_EXPR, type, TREE_OPERAND (expr, 0),
- convert (type, TREE_OPERAND (expr, 1)),
+ convert (type, TREE_OPERAND (expr, 1)),
convert (type, TREE_OPERAND (expr, 2))));
default:
/* Convert EXPR to the complex type TYPE in the usual ways. */
tree
-convert_to_complex (type, expr)
- tree type, expr;
+convert_to_complex (tree type, tree expr)
{
tree subtype = TREE_TYPE (type);
-
+
switch (TREE_CODE (TREE_TYPE (expr)))
{
case REAL_TYPE:
/* Convert EXPR to the vector type TYPE in the usual ways. */
tree
-convert_to_vector (type, expr)
- tree type, expr;
+convert_to_vector (tree type, tree expr)
{
switch (TREE_CODE (TREE_TYPE (expr)))
{
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