-/* Front-end tree definitions for GNU compiler.
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+/* Definitions of floating-point access for GNU compiler.
+ Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
+ 1999, 2000 Free Software Foundation, Inc.
This file is part of GNU CC.
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. */
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#ifndef REAL_H_INCLUDED
#define REAL_H_INCLUDED
#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. */
#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
+/* MAX_LONG_DOUBLE_TYPE_SIZE is a constant tested by #if.
+ LONG_DOUBLE_TYPE_SIZE can vary at compiler run time.
+ So long as macros like REAL_VALUE_TO_TARGET_LONG_DOUBLE cannot
+ vary too, however, then XFmode and TFmode long double
+ cannot both be supported at the same time. */
+#ifndef MAX_LONG_DOUBLE_TYPE_SIZE
+#define MAX_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
+#endif
+#if (MAX_LONG_DOUBLE_TYPE_SIZE == 96) || (MAX_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 (MAX_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 (MAX_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 unsigned int significand_size PARAMS ((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 PARAMS ((REAL_VALUE_TYPE *, int,
+ REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
+extern REAL_VALUE_TYPE etrunci PARAMS ((REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE etruncui PARAMS ((REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
+extern REAL_VALUE_TYPE ereal_negate PARAMS ((REAL_VALUE_TYPE));
+extern HOST_WIDE_INT efixi PARAMS ((REAL_VALUE_TYPE));
+extern unsigned HOST_WIDE_INT efixui PARAMS ((REAL_VALUE_TYPE));
+extern void ereal_from_int PARAMS ((REAL_VALUE_TYPE *,
+ HOST_WIDE_INT, HOST_WIDE_INT,
+ enum machine_mode));
+extern void ereal_from_uint PARAMS ((REAL_VALUE_TYPE *,
+ unsigned HOST_WIDE_INT,
+ unsigned HOST_WIDE_INT,
+ enum machine_mode));
+extern void ereal_to_int PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *,
+ REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE ereal_ldexp PARAMS ((REAL_VALUE_TYPE, int));
+
+extern void etartdouble PARAMS ((REAL_VALUE_TYPE, long *));
+extern void etarldouble PARAMS ((REAL_VALUE_TYPE, long *));
+extern void etardouble PARAMS ((REAL_VALUE_TYPE, long *));
+extern long etarsingle PARAMS ((REAL_VALUE_TYPE));
+extern void ereal_to_decimal PARAMS ((REAL_VALUE_TYPE, char *));
+extern int ereal_cmp PARAMS ((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
+extern int ereal_isneg PARAMS ((REAL_VALUE_TYPE));
+extern REAL_VALUE_TYPE ereal_unto_float PARAMS ((long));
+extern REAL_VALUE_TYPE ereal_unto_double PARAMS ((long *));
+extern REAL_VALUE_TYPE ereal_from_float PARAMS ((HOST_WIDE_INT));
+extern REAL_VALUE_TYPE ereal_from_double PARAMS ((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 PARAMS ((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(s,m) ereal_atof(s,m)
+#define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
+
+#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 defined(INTEL_EXTENDED_IEEE_FORMAT) && MAX_LONG_DOUBLE_TYPE_SIZE == 128
+#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
+#else
+#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
+ (LONG_DOUBLE_TYPE_SIZE == 64 ? etardouble ((IN), (OUT)) \
+ : LONG_DOUBLE_TYPE_SIZE == 96 ? etarldouble ((IN), (OUT)) \
+ : LONG_DOUBLE_TYPE_SIZE == 128 ? etartdouble ((IN), (OUT)) \
+ : abort())
+#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. */
#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
#define REAL_IS_NOT_DOUBLE
#ifndef REAL_VALUE_TYPE
-#define REAL_VALUE_TYPE \
- struct real_value { long i[sizeof (double) / sizeof (long)]; }
+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). */
#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) \
+ (!memcmp ((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))
+#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))
+#define REAL_VALUES_LESS(x, y) ((x) < (y))
#endif
-/* Convert a floating-point value to integer by truncating. */
-#ifndef REAL_VALUE_FIX_TRUNCATE
-#define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x))
+/* Truncate toward zero to an integer floating-point value. */
+#ifndef REAL_VALUE_RNDZINT
+#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
#endif
-/* Convert a floating-point value to unsigned integer by truncating. */
-#ifndef REAL_VALUE_UNSIGNED_FIX_TRUNCATE
-#define REAL_VALUE_UNSIGNED_FIX_TRUNCATE(x) ((unsigned int) (x))
+/* 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, using any rounding mode. */
+/* 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, using any rounding
- mode. */
+/* 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 ();
+#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
+extern double ldexp PARAMS ((double, int));
#endif
/* Convert the string X to a floating-point value. */
#ifndef REAL_VALUE_ATOF
-#define REAL_VALUE_ATOF(x) atof (x)
+#if 1
+/* Use real.c to convert decimal numbers to binary, ... */
+extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
+#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
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 PARAMS ((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
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 PARAMS ((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 \
#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 PARAMS ((REAL_VALUE_TYPE));
+extern int target_isinf PARAMS ((REAL_VALUE_TYPE));
+extern int target_negative PARAMS ((REAL_VALUE_TYPE));
+
/* Determine whether a floating-point value X is minus 0. */
#ifndef REAL_VALUE_MINUS_ZERO
-#define REAL_VALUE_MINUS_ZERO(x) (target_minus_zero (x))
+#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
#endif
\f
/* Constant real values 0, 1, 2, and -1. */
union real_extract
{
REAL_VALUE_TYPE d;
- int i[sizeof (REAL_VALUE_TYPE) / sizeof (int)];
+ 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) XINT (r, 2)
-#define CONST_DOUBLE_HIGH(r) XINT (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. */
-REAL_VALUE_TYPE real_value_from_int_cst ();
-
-/* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
+union tree_node;
+REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
+ union tree_node *));
#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
do { union real_extract u; \
- bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \
+ memcpy (&u, &CONST_DOUBLE_LOW ((from)), 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)
+#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
+extern struct rtx_def *immed_real_const_1 PARAMS ((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 PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
+extern int target_isnan PARAMS ((REAL_VALUE_TYPE));
+extern int target_isinf PARAMS ((REAL_VALUE_TYPE));
+extern int target_negative PARAMS ((REAL_VALUE_TYPE));
+extern void debug_real PARAMS ((REAL_VALUE_TYPE));
+
+/* In varasm.c */
+extern void assemble_real PARAMS ((REAL_VALUE_TYPE,
+ enum machine_mode));
+extern void debug_real PARAMS ((REAL_VALUE_TYPE));
+
+/* In varasm.c */
+extern void assemble_real PARAMS ((REAL_VALUE_TYPE,
+ enum machine_mode));
#endif /* Not REAL_H_INCLUDED */
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