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- /* Front-end tree definitions for GNU compiler.
- Copyright (C) 1989, 1991, 1994 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, 675 Mass Ave, Cambridge, MA 02139, 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
-
- /* 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));
- extern void ereal_from_uint PROTO((REAL_VALUE_TYPE *,
- unsigned HOST_WIDE_INT,
- unsigned HOST_WIDE_INT));
- 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_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 ();
- #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))
-
- #define REAL_VALUE_ATOF 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) \
- ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi))
-
- #define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi) (ereal_from_uint (&d, lo, hi))
-
- /* 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)))
-
- /* 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 { float f = (float) (IN); \
- (OUT) = *(long *) &f; \
- } 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
- #if HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN
- #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
- do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
- (OUT)[0] = ((long *) &in)[0]; \
- (OUT)[1] = ((long *) &in)[1]; \
- } while (0)
- #else
- #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
- do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
- (OUT)[1] = ((long *) &in)[0]; \
- (OUT)[0] = ((long *) &in)[1]; \
- } while (0)
- #endif
- #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 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)
- #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
-
- /* 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 ();
-
- #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
-
- /* 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)
-
- /* Function to return a real value (not a tree node)
- from a given integer constant. */
- REAL_VALUE_TYPE real_value_from_int_cst ();
-
- /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
-
- #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
-
- #endif /* Not REAL_H_INCLUDED */
-