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+/* Definitions of floating-point access for GNU compiler.
+   Copyright (C) 1989, 91, 94, 96, 97, 1998 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#ifndef REAL_H_INCLUDED
+#define REAL_H_INCLUDED
+
+/* Define codes for all the float formats that we know of.  */
+#define UNKNOWN_FLOAT_FORMAT 0
+#define IEEE_FLOAT_FORMAT 1
+#define VAX_FLOAT_FORMAT 2
+#define IBM_FLOAT_FORMAT 3
+#define C4X_FLOAT_FORMAT 4
+
+/* Default to IEEE float if not specified.  Nearly all machines use it.  */
+
+#ifndef TARGET_FLOAT_FORMAT
+#define	TARGET_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
+#endif
+
+#ifndef HOST_FLOAT_FORMAT
+#define	HOST_FLOAT_FORMAT	IEEE_FLOAT_FORMAT
+#endif
+
+#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
+#define REAL_INFINITY
+#endif
+
+/* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
+   in the header files, then this implies the word-endianness is the same as
+   for integers.  */
+
+/* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
+#ifndef FLOAT_WORDS_BIG_ENDIAN
+#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
+#endif
+
+/* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN.  */
+#ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
+#ifdef HOST_WORDS_BIG_ENDIAN
+#define HOST_FLOAT_WORDS_BIG_ENDIAN 1
+#else
+#define HOST_FLOAT_WORDS_BIG_ENDIAN 0
+#endif
+#endif
+
+/* Defining REAL_ARITHMETIC invokes a floating point emulator
+   that can produce a target machine format differing by more
+   than just endian-ness from the host's format.  The emulator
+   is also used to support extended real XFmode.  */
+#ifndef LONG_DOUBLE_TYPE_SIZE
+#define LONG_DOUBLE_TYPE_SIZE 64
+#endif
+#if (LONG_DOUBLE_TYPE_SIZE == 96) || (LONG_DOUBLE_TYPE_SIZE == 128)
+#ifndef REAL_ARITHMETIC
+#define REAL_ARITHMETIC
+#endif
+#endif
+#ifdef REAL_ARITHMETIC
+/* **** Start of software floating point emulator interface macros **** */
+
+/* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
+   has been defined to be 96 in the tm.h machine file. */
+#if (LONG_DOUBLE_TYPE_SIZE == 96)
+#define REAL_IS_NOT_DOUBLE
+#define REAL_ARITHMETIC
+typedef struct {
+  HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
+} realvaluetype;
+#define REAL_VALUE_TYPE realvaluetype
+
+#else /* no XFmode support */
+
+#if (LONG_DOUBLE_TYPE_SIZE == 128)
+
+#define REAL_IS_NOT_DOUBLE
+#define REAL_ARITHMETIC
+typedef struct {
+  HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
+} realvaluetype;
+#define REAL_VALUE_TYPE realvaluetype
+
+#else /* not TFmode */
+
+#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
+/* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
+   but it is not necessarily a host machine double. */
+#define REAL_IS_NOT_DOUBLE
+typedef struct {
+  HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
+} realvaluetype;
+#define REAL_VALUE_TYPE realvaluetype
+#else
+/* If host and target formats are compatible, then a REAL_VALUE_TYPE
+   is actually a host machine double. */
+#define REAL_VALUE_TYPE double
+#endif
+
+#endif /* no TFmode support */
+#endif /* no XFmode support */
+
+extern int significand_size	PROTO((enum machine_mode));
+
+/* If emulation has been enabled by defining REAL_ARITHMETIC or by
+   setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
+   they invoke emulator functions. This will succeed only if the machine
+   files have been updated to use these macros in place of any
+   references to host machine `double' or `float' types.  */
+#ifdef REAL_ARITHMETIC
+#undef REAL_ARITHMETIC
+#define REAL_ARITHMETIC(value, code, d1, d2) \
+  earith (&(value), (code), &(d1), &(d2))
+
+/* Declare functions in real.c. */
+extern void earith		PROTO((REAL_VALUE_TYPE *, int,
+				       REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
+extern REAL_VALUE_TYPE etrunci	PROTO((REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE etruncui	PROTO((REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE ereal_atof PROTO((char *, enum machine_mode));
+extern REAL_VALUE_TYPE ereal_negate PROTO((REAL_VALUE_TYPE));
+extern HOST_WIDE_INT efixi	PROTO((REAL_VALUE_TYPE));
+extern unsigned HOST_WIDE_INT efixui PROTO((REAL_VALUE_TYPE));
+extern void ereal_from_int	PROTO((REAL_VALUE_TYPE *,
+				       HOST_WIDE_INT, HOST_WIDE_INT,
+				       enum machine_mode));
+extern void ereal_from_uint	PROTO((REAL_VALUE_TYPE *,
+				       unsigned HOST_WIDE_INT,
+				       unsigned HOST_WIDE_INT,
+				       enum machine_mode));
+extern void ereal_to_int	PROTO((HOST_WIDE_INT *, HOST_WIDE_INT *,
+				       REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));
+
+extern void etartdouble		PROTO((REAL_VALUE_TYPE, long *));
+extern void etarldouble		PROTO((REAL_VALUE_TYPE, long *));
+extern void etardouble		PROTO((REAL_VALUE_TYPE, long *));
+extern long etarsingle		PROTO((REAL_VALUE_TYPE));
+extern void ereal_to_decimal	PROTO((REAL_VALUE_TYPE, char *));
+extern int ereal_cmp		PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
+extern int ereal_isneg		PROTO((REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE ereal_unto_float PROTO((long));
+extern REAL_VALUE_TYPE ereal_unto_double PROTO((long *));
+extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
+extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
+
+#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
+/* true if x < y : */
+#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
+#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
+
+/* These return REAL_VALUE_TYPE: */
+#define REAL_VALUE_RNDZINT(x) (etrunci (x))
+#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
+extern REAL_VALUE_TYPE real_value_truncate	PROTO ((enum machine_mode,
+							REAL_VALUE_TYPE));
+#define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
+
+/* These return HOST_WIDE_INT: */
+/* Convert a floating-point value to integer, rounding toward zero.  */
+#define REAL_VALUE_FIX(x) (efixi (x))
+/* Convert a floating-point value to unsigned integer, rounding
+   toward zero. */
+#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
+
+/* Convert ASCII string S to floating point in mode M.
+   Decimal input uses ATOF.  Hexadecimal uses HTOF.  */
+#define REAL_VALUE_ATOF ereal_atof
+#define REAL_VALUE_HTOF ereal_atof
+
+#define REAL_VALUE_NEGATE ereal_negate
+
+#define REAL_VALUE_MINUS_ZERO(x) \
+ ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
+
+#define REAL_VALUE_TO_INT ereal_to_int
+
+/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0.  */
+#define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
+  ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
+
+#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
+  ereal_from_uint (&d, lo, hi, mode)
+
+/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs. */
+#if LONG_DOUBLE_TYPE_SIZE == 96
+#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
+#else
+#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
+#endif
+#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
+
+/* IN is a REAL_VALUE_TYPE.  OUT is a long. */
+#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
+
+/* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
+#define REAL_VALUE_UNTO_TARGET_DOUBLE(d)  (ereal_unto_double (d))
+
+/* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
+#define REAL_VALUE_UNTO_TARGET_SINGLE(f)  (ereal_unto_float (f))
+
+/* d is an array of HOST_WIDE_INT that holds a double precision
+   value in the target computer's floating point format. */
+#define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))
+
+/* f is a HOST_WIDE_INT containing a single precision target float value. */
+#define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
+
+/* Conversions to decimal ASCII string.  */
+#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
+
+#endif /* REAL_ARITHMETIC defined */
+
+/* **** End of software floating point emulator interface macros **** */
+#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
+
+/* old interface */
+#ifdef REAL_ARITHMETIC
+/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
+   when REAL_ARITHMETIC etc. are not defined.  */
+
+/* Now see if the host and target machines use the same format. 
+   If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
+   reals as doubles because we have no better way in this cross compiler.)
+   This turns off various optimizations that can happen when we know the
+   compiler's float format matches the target's float format.
+   */
+#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
+#define	REAL_IS_NOT_DOUBLE
+#ifndef REAL_VALUE_TYPE
+typedef struct {
+    HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
+  } realvaluetype;
+#define REAL_VALUE_TYPE realvaluetype
+#endif /* no REAL_VALUE_TYPE */
+#endif /* formats differ */
+#endif /* 0 */
+
+#endif /* emulator not used */
+
+/* If we are not cross-compiling, use a `double' to represent the
+   floating-point value.  Otherwise, use some other type
+   (probably a struct containing an array of longs).  */
+#ifndef REAL_VALUE_TYPE
+#define REAL_VALUE_TYPE double
+#else
+#define REAL_IS_NOT_DOUBLE
+#endif
+
+#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
+
+/* Convert a type `double' value in host format first to a type `float'
+   value in host format and then to a single type `long' value which
+   is the bitwise equivalent of the `float' value.  */
+#ifndef REAL_VALUE_TO_TARGET_SINGLE
+#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT)		\
+do {							\
+  union {						\
+    float f;						\
+    HOST_WIDE_INT l;					\
+  } u;							\
+  if (sizeof(HOST_WIDE_INT) < sizeof(float))		\
+    abort();						\
+  u.l = 0;						\
+  u.f = (IN);						\
+  (OUT) = u.l;						\
+} while (0)
+#endif
+
+/* Convert a type `double' value in host format to a pair of type `long'
+   values which is its bitwise equivalent, but put the two words into
+   proper word order for the target.  */
+#ifndef REAL_VALUE_TO_TARGET_DOUBLE
+#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)				\
+do {									\
+  union {								\
+    REAL_VALUE_TYPE f;							\
+    HOST_WIDE_INT l[2];							\
+  } u;									\
+  if (sizeof(HOST_WIDE_INT) * 2 < sizeof(REAL_VALUE_TYPE))		\
+    abort();								\
+  u.l[0] = u.l[1] = 0;							\
+  u.f = (IN);								\
+  if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN)		\
+    (OUT)[0] = u.l[0], (OUT)[1] = u.l[1];				\
+  else									\
+    (OUT)[1] = u.l[0], (OUT)[0] = u.l[1];				\
+} while (0)
+#endif
+#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
+
+/* In this configuration, double and long double are the same. */
+#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
+#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
+#endif
+
+/* Compare two floating-point objects for bitwise identity.
+   This is not the same as comparing for equality on IEEE hosts:
+   -0.0 equals 0.0 but they are not identical, and conversely
+   two NaNs might be identical but they cannot be equal.  */
+#define REAL_VALUES_IDENTICAL(x, y) \
+  (!bcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
+
+/* Compare two floating-point values for equality.  */
+#ifndef REAL_VALUES_EQUAL
+#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
+#endif
+
+/* Compare two floating-point values for less than.  */
+#ifndef REAL_VALUES_LESS
+#define REAL_VALUES_LESS(x, y) ((x) < (y))
+#endif
+
+/* Truncate toward zero to an integer floating-point value.  */
+#ifndef REAL_VALUE_RNDZINT
+#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
+#endif
+
+/* Truncate toward zero to an unsigned integer floating-point value.  */
+#ifndef REAL_VALUE_UNSIGNED_RNDZINT
+#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
+#endif
+
+/* Convert a floating-point value to integer, rounding toward zero.  */
+#ifndef REAL_VALUE_FIX
+#define REAL_VALUE_FIX(x) ((int) (x))
+#endif
+
+/* Convert a floating-point value to unsigned integer, rounding
+   toward zero. */
+#ifndef REAL_VALUE_UNSIGNED_FIX
+#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
+#endif
+
+/* Scale X by Y powers of 2.  */
+#ifndef REAL_VALUE_LDEXP
+#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
+extern double ldexp ();
+#endif
+
+/* Convert the string X to a floating-point value.  */
+#ifndef REAL_VALUE_ATOF
+#if 1
+/* Use real.c to convert decimal numbers to binary, ... */
+REAL_VALUE_TYPE ereal_atof ();
+#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
+/* Could use ereal_atof here for hexadecimal floats too, but real_hex_to_f
+   is OK and it uses faster native fp arithmetic.  */
+/* #define REAL_VALUE_HTOF(x, s) ereal_atof (x, s) */
+#else
+/* ... or, if you like the host computer's atof, go ahead and use it: */
+#define REAL_VALUE_ATOF(x, s) atof (x)
+#if defined (MIPSEL) || defined (MIPSEB)
+/* MIPS compiler can't handle parens around the function name.
+   This problem *does not* appear to be connected with any
+   macro definition for atof.  It does not seem there is one.  */
+extern double atof ();
+#else
+extern double (atof) ();
+#endif
+#endif
+#endif
+
+/* Hexadecimal floating constant input for use with host computer's
+   fp arithmetic.  */
+#ifndef REAL_VALUE_HTOF
+extern REAL_VALUE_TYPE real_hex_to_f PROTO((char *, enum machine_mode));
+#define REAL_VALUE_HTOF(s,m) real_hex_to_f(s,m)
+#endif
+
+/* Negate the floating-point value X.  */
+#ifndef REAL_VALUE_NEGATE
+#define REAL_VALUE_NEGATE(x) (- (x))
+#endif
+
+/* Truncate the floating-point value X to mode MODE.  This is correct only
+   for the most common case where the host and target have objects of the same
+   size and where `float' is SFmode.  */
+
+/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate.  */
+extern REAL_VALUE_TYPE real_value_truncate PROTO((enum machine_mode, REAL_VALUE_TYPE));
+
+#ifndef REAL_VALUE_TRUNCATE
+#define REAL_VALUE_TRUNCATE(mode, x) \
+ (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR	\
+  ? (float) (x) : (x))
+#endif
+
+/* Determine whether a floating-point value X is infinite. */
+#ifndef REAL_VALUE_ISINF
+#define REAL_VALUE_ISINF(x) (target_isinf (x))
+#endif
+
+/* Determine whether a floating-point value X is a NaN. */
+#ifndef REAL_VALUE_ISNAN
+#define REAL_VALUE_ISNAN(x) (target_isnan (x))
+#endif
+
+/* Determine whether a floating-point value X is negative. */
+#ifndef REAL_VALUE_NEGATIVE
+#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
+#endif
+
+extern int target_isnan			PROTO ((REAL_VALUE_TYPE));
+extern int target_isinf			PROTO ((REAL_VALUE_TYPE));
+extern int target_negative		PROTO ((REAL_VALUE_TYPE));
+
+/* Determine whether a floating-point value X is minus 0. */
+#ifndef REAL_VALUE_MINUS_ZERO
+#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
+#endif
+
+/* Constant real values 0, 1, 2, and -1.  */
+
+extern REAL_VALUE_TYPE dconst0;
+extern REAL_VALUE_TYPE dconst1;
+extern REAL_VALUE_TYPE dconst2;
+extern REAL_VALUE_TYPE dconstm1;
+
+/* Union type used for extracting real values from CONST_DOUBLEs
+   or putting them in.  */
+
+union real_extract 
+{
+  REAL_VALUE_TYPE d;
+  HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
+};
+
+/* For a CONST_DOUBLE:
+   The usual two ints that hold the value.
+   For a DImode, that is all there are;
+    and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
+   For a float, the number of ints varies,
+    and CONST_DOUBLE_LOW is the one that should come first *in memory*.
+    So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
+#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
+#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
+
+/* Link for chain of all CONST_DOUBLEs in use in current function.  */
+#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
+/* The MEM which represents this CONST_DOUBLE's value in memory,
+   or const0_rtx if no MEM has been made for it yet,
+   or cc0_rtx if it is not on the chain.  */
+#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
+
+/* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
+/* Function to return a real value (not a tree node)
+   from a given integer constant.  */
+union tree_node;
+REAL_VALUE_TYPE real_value_from_int_cst	PROTO ((union tree_node *,
+						union tree_node *));
+
+#define REAL_VALUE_FROM_CONST_DOUBLE(to, from)		\
+do { union real_extract u;				\
+     bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
+     to = u.d; } while (0)
+
+/* Return a CONST_DOUBLE with value R and mode M.  */
+
+#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r,  m)
+extern struct rtx_def *immed_real_const_1	PROTO((REAL_VALUE_TYPE,
+						       enum machine_mode));
+
+
+/* Convert a floating point value `r', that can be interpreted
+   as a host machine float or double, to a decimal ASCII string `s'
+   using printf format string `fmt'.  */
+#ifndef REAL_VALUE_TO_DECIMAL
+#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
+#endif
+
+/* Replace R by 1/R in the given machine mode, if the result is exact.  */
+extern int exact_real_inverse PROTO((enum machine_mode, REAL_VALUE_TYPE *));
+
+extern void debug_real			PROTO ((REAL_VALUE_TYPE));
+
+/* In varasm.c */
+extern void assemble_real		PROTO ((REAL_VALUE_TYPE,
+						enum machine_mode));
+#endif /* Not REAL_H_INCLUDED */