/* Utility routines for data type conversion for GCC.
Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1997, 1998,
- 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of GCC.
#include "toplev.h"
#include "langhooks.h"
#include "real.h"
-/* Convert EXPR to some pointer or reference type TYPE.
+/* Convert EXPR to some pointer or reference type TYPE.
EXPR must be pointer, reference, integer, enumeral, or literal zero;
in other cases error is called. */
tree
convert_to_pointer (tree type, tree expr)
{
+ if (TREE_TYPE (expr) == type)
+ return expr;
+
if (integer_zerop (expr))
- return build_int_cst (type, 0);
+ {
+ tree t = build_int_cst (type, 0);
+ if (TREE_OVERFLOW (expr) || TREE_CONSTANT_OVERFLOW (expr))
+ t = force_fit_type (t, 0, TREE_OVERFLOW (expr),
+ TREE_CONSTANT_OVERFLOW (expr));
+ return t;
+ }
switch (TREE_CODE (TREE_TYPE (expr)))
{
case POINTER_TYPE:
case REFERENCE_TYPE:
- return build1 (NOP_EXPR, type, expr);
+ return fold_build1 (NOP_EXPR, type, expr);
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
- case CHAR_TYPE:
if (TYPE_PRECISION (TREE_TYPE (expr)) != POINTER_SIZE)
expr = fold_build1 (NOP_EXPR,
lang_hooks.types.type_for_size (POINTER_SIZE, 0),
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 safe for
+ round-to-nearest rounding mode. */
case ABS_EXPR:
case NEGATE_EXPR:
- if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
+ if (!flag_rounding_math
+ && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (expr)))
return build1 (TREE_CODE (expr), type,
fold (convert_to_real (type,
TREE_OPERAND (expr, 0))));
switch (TREE_CODE (TREE_TYPE (expr)))
{
case REAL_TYPE:
- return build1 (flag_float_store ? CONVERT_EXPR : NOP_EXPR,
- type, expr);
+ /* Ignore the conversion if we don't need to store intermediate
+ results and neither type is a decimal float. */
+ return build1 ((flag_float_store
+ || DECIMAL_FLOAT_TYPE_P (type)
+ || DECIMAL_FLOAT_TYPE_P (itype))
+ ? CONVERT_EXPR : NOP_EXPR, type, expr);
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
- case CHAR_TYPE:
return build1 (FLOAT_EXPR, type, expr);
case COMPLEX_TYPE:
/* Only convert in ISO C99 mode. */
if (!TARGET_C99_FUNCTIONS)
break;
- if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (long_long_integer_type_node))
- fn = mathfn_built_in (s_intype, BUILT_IN_LLCEIL);
- else
+ if (outprec < TYPE_PRECISION (long_integer_type_node)
+ || (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type)))
fn = mathfn_built_in (s_intype, BUILT_IN_LCEIL);
+ else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
+ fn = mathfn_built_in (s_intype, BUILT_IN_LLCEIL);
break;
CASE_FLT_FN (BUILT_IN_FLOOR):
/* Only convert in ISO C99 mode. */
if (!TARGET_C99_FUNCTIONS)
break;
- if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (long_long_integer_type_node))
- fn = mathfn_built_in (s_intype, BUILT_IN_LLFLOOR);
- else
+ if (outprec < TYPE_PRECISION (long_integer_type_node)
+ || (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type)))
fn = mathfn_built_in (s_intype, BUILT_IN_LFLOOR);
+ else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
+ fn = mathfn_built_in (s_intype, BUILT_IN_LLFLOOR);
break;
CASE_FLT_FN (BUILT_IN_ROUND):
- if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (long_long_integer_type_node))
- fn = mathfn_built_in (s_intype, BUILT_IN_LLROUND);
- else
+ if (outprec < TYPE_PRECISION (long_integer_type_node)
+ || (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type)))
fn = mathfn_built_in (s_intype, BUILT_IN_LROUND);
+ else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
+ fn = mathfn_built_in (s_intype, BUILT_IN_LLROUND);
break;
CASE_FLT_FN (BUILT_IN_RINT):
break;
/* ... Fall through ... */
CASE_FLT_FN (BUILT_IN_NEARBYINT):
- if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (long_long_integer_type_node))
- fn = mathfn_built_in (s_intype, BUILT_IN_LLRINT);
- else
- fn = mathfn_built_in (s_intype, BUILT_IN_LRINT);
+ if (outprec < TYPE_PRECISION (long_integer_type_node)
+ || (outprec == TYPE_PRECISION (long_integer_type_node)
+ && !TYPE_UNSIGNED (type)))
+ fn = mathfn_built_in (s_intype, BUILT_IN_LRINT);
+ else if (outprec == TYPE_PRECISION (long_long_integer_type_node)
+ && !TYPE_UNSIGNED (type))
+ fn = mathfn_built_in (s_intype, BUILT_IN_LLRINT);
break;
CASE_FLT_FN (BUILT_IN_TRUNC):
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
- case CHAR_TYPE:
/* If this is a logical operation, which just returns 0 or 1, we can
change the type of the expression. */
else if (outprec >= inprec)
{
enum tree_code code;
+ tree tem;
/* If the precision of the EXPR's type is K bits and the
destination mode has more bits, and the sign is changing,
else
code = NOP_EXPR;
- return fold_build1 (code, type, expr);
+ tem = fold_unary (code, type, expr);
+ if (tem)
+ return tem;
+
+ tem = build1 (code, type, expr);
+ TREE_NO_WARNING (tem) = 1;
+ return tem;
}
/* If TYPE is an enumeral type or a type with a precision less
|| ex_form == RSHIFT_EXPR
|| ex_form == LROTATE_EXPR
|| ex_form == RROTATE_EXPR))
- || ex_form == LSHIFT_EXPR)
+ || ex_form == LSHIFT_EXPR
+ /* If we have !flag_wrapv, and either ARG0 or
+ ARG1 is of a signed type, we have to do
+ PLUS_EXPR or MINUS_EXPR in an unsigned
+ type. Otherwise, we would introduce
+ signed-overflow undefinedness. */
+ || (!flag_wrapv
+ && (ex_form == PLUS_EXPR
+ || ex_form == MINUS_EXPR)
+ && (!TYPE_UNSIGNED (TREE_TYPE (arg0))
+ || !TYPE_UNSIGNED (TREE_TYPE (arg1)))))
typex = lang_hooks.types.unsigned_type (typex);
else
typex = lang_hooks.types.signed_type (typex);
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
- case CHAR_TYPE:
return build2 (COMPLEX_EXPR, type, convert (subtype, expr),
convert (subtype, integer_zero_node));
OSDN Git Service
