295 lines
6.3 KiB
C
295 lines
6.3 KiB
C
#ifndef _IEEE_FP_H_
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#define _IEEE_FP_H_
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#include "_ansi.h"
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#include <machine/ieeefp.h>
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#include <float.h>
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_BEGIN_STD_C
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/* FIXME FIXME FIXME:
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Neither of __ieee_{float,double}_shape_type seem to be used anywhere
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except in libm/test. If that is the case, please delete these from here.
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If that is not the case, please insert documentation here describing why
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they're needed. */
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#ifdef __IEEE_BIG_ENDIAN
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typedef union
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{
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double value;
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struct
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{
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unsigned int sign : 1;
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unsigned int exponent: 11;
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unsigned int fraction0:4;
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unsigned int fraction1:16;
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unsigned int fraction2:16;
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unsigned int fraction3:16;
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} number;
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struct
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{
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unsigned int sign : 1;
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unsigned int exponent: 11;
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unsigned int quiet:1;
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unsigned int function0:3;
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unsigned int function1:16;
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unsigned int function2:16;
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unsigned int function3:16;
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} nan;
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struct
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{
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unsigned long msw;
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unsigned long lsw;
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} parts;
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long aslong[2];
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} __ieee_double_shape_type;
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#elif defined __IEEE_LITTLE_ENDIAN
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typedef union
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{
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double value;
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struct
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{
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#ifdef __SMALL_BITFIELDS
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unsigned int fraction3:16;
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unsigned int fraction2:16;
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unsigned int fraction1:16;
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unsigned int fraction0: 4;
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#else
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unsigned int fraction1:32;
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unsigned int fraction0:20;
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#endif
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unsigned int exponent :11;
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unsigned int sign : 1;
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} number;
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struct
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{
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#ifdef __SMALL_BITFIELDS
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unsigned int function3:16;
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unsigned int function2:16;
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unsigned int function1:16;
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unsigned int function0:3;
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#else
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unsigned int function1:32;
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unsigned int function0:19;
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#endif
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unsigned int quiet:1;
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unsigned int exponent: 11;
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unsigned int sign : 1;
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} nan;
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struct
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{
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unsigned long lsw;
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unsigned long msw;
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} parts;
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long aslong[2];
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} __ieee_double_shape_type;
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#endif /* __IEEE_LITTLE_ENDIAN */
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#ifdef __IEEE_BIG_ENDIAN
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typedef union
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{
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float value;
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struct
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{
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unsigned int sign : 1;
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unsigned int exponent: 8;
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unsigned int fraction0: 7;
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unsigned int fraction1: 16;
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} number;
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struct
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{
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unsigned int sign:1;
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unsigned int exponent:8;
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unsigned int quiet:1;
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unsigned int function0:6;
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unsigned int function1:16;
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} nan;
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long p1;
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} __ieee_float_shape_type;
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#elif defined __IEEE_LITTLE_ENDIAN
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typedef union
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{
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float value;
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struct
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{
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unsigned int fraction0: 7;
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unsigned int fraction1: 16;
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unsigned int exponent: 8;
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unsigned int sign : 1;
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} number;
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struct
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{
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unsigned int function1:16;
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unsigned int function0:6;
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unsigned int quiet:1;
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unsigned int exponent:8;
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unsigned int sign:1;
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} nan;
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long p1;
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} __ieee_float_shape_type;
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#endif /* __IEEE_LITTLE_ENDIAN */
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#ifndef _LDBL_EQ_DBL
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#ifndef LDBL_MANT_DIG
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#error "LDBL_MANT_DIG not defined - should be found in float.h"
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#elif LDBL_MANT_DIG == DBL_MANT_DIG
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#error "double and long double are the same size but LDBL_EQ_DBL is not defined"
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#elif LDBL_MANT_DIG == 53
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/* This happens when doubles are 32-bits and long doubles are 64-bits. */
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#define EXT_EXPBITS 11
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#define EXT_FRACHBITS 20
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#define EXT_FRACLBITS 32
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#define __ieee_ext_field_type unsigned long
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#elif LDBL_MANT_DIG == 64
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#define EXT_EXPBITS 15
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#define EXT_FRACHBITS 32
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#define EXT_FRACLBITS 32
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#define __ieee_ext_field_type unsigned int
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#elif LDBL_MANT_DIG == 65
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#define EXT_EXPBITS 15
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#define EXT_FRACHBITS 32
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#define EXT_FRACLBITS 32
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#define __ieee_ext_field_type unsigned int
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#elif LDBL_MANT_DIG == 112
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#define EXT_EXPBITS 15
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#define EXT_FRACHBITS 48
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#define EXT_FRACLBITS 64
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#define __ieee_ext_field_type unsigned long long
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#elif LDBL_MANT_DIG == 113
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#define EXT_EXPBITS 15
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#define EXT_FRACHBITS 48
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#define EXT_FRACLBITS 64
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#define __ieee_ext_field_type unsigned long long
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#else
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#error Unsupported value for LDBL_MANT_DIG
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#endif
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#define EXT_EXP_INFNAN ((1 << EXT_EXPBITS) - 1) /* 32767 */
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#define EXT_EXP_BIAS ((1 << (EXT_EXPBITS - 1)) - 1) /* 16383 */
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#define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS)
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typedef struct ieee_ext
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{
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__ieee_ext_field_type ext_fracl : EXT_FRACLBITS;
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__ieee_ext_field_type ext_frach : EXT_FRACHBITS;
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__ieee_ext_field_type ext_exp : EXT_EXPBITS;
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__ieee_ext_field_type ext_sign : 1;
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} ieee_ext;
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typedef union ieee_ext_u
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{
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long double extu_ld;
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struct ieee_ext extu_ext;
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} ieee_ext_u;
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#endif /* ! _LDBL_EQ_DBL */
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/* FLOATING ROUNDING */
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typedef int fp_rnd;
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#define FP_RN 0 /* Round to nearest */
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#define FP_RM 1 /* Round down */
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#define FP_RP 2 /* Round up */
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#define FP_RZ 3 /* Round to zero (trunate) */
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fp_rnd fpgetround (void);
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fp_rnd fpsetround (fp_rnd);
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/* EXCEPTIONS */
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typedef int fp_except;
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#define FP_X_INV 0x10 /* Invalid operation */
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#define FP_X_DX 0x80 /* Divide by zero */
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#define FP_X_OFL 0x04 /* Overflow exception */
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#define FP_X_UFL 0x02 /* Underflow exception */
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#define FP_X_IMP 0x01 /* imprecise exception */
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fp_except fpgetmask (void);
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fp_except fpsetmask (fp_except);
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fp_except fpgetsticky (void);
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fp_except fpsetsticky (fp_except);
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/* INTEGER ROUNDING */
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typedef int fp_rdi;
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#define FP_RDI_TOZ 0 /* Round to Zero */
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#define FP_RDI_RD 1 /* Follow float mode */
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fp_rdi fpgetroundtoi (void);
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fp_rdi fpsetroundtoi (fp_rdi);
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#define __IEEE_DBL_EXPBIAS 1023
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#define __IEEE_FLT_EXPBIAS 127
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#define __IEEE_DBL_EXPLEN 11
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#define __IEEE_FLT_EXPLEN 8
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#define __IEEE_DBL_FRACLEN (64 - (__IEEE_DBL_EXPLEN + 1))
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#define __IEEE_FLT_FRACLEN (32 - (__IEEE_FLT_EXPLEN + 1))
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#define __IEEE_DBL_MAXPOWTWO ((double)(1L << 32 - 2) * (1L << (32-11) - 32 + 1))
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#define __IEEE_FLT_MAXPOWTWO ((float)(1L << (32-8) - 1))
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#define __IEEE_DBL_NAN_EXP 0x7ff
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#define __IEEE_FLT_NAN_EXP 0xff
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#ifdef __ieeefp_isnanf
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#define isnanf(x) __ieeefp_isnanf(x)
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#endif
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#ifdef __ieeefp_isinff
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#define isinff(x) __ieeefp_isinff(x)
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#endif
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#ifdef __ieeefp_finitef
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#define finitef(x) __ieeefp_finitef(x)
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#endif
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#ifdef _DOUBLE_IS_32BITS
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#undef __IEEE_DBL_EXPBIAS
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#define __IEEE_DBL_EXPBIAS __IEEE_FLT_EXPBIAS
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#undef __IEEE_DBL_EXPLEN
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#define __IEEE_DBL_EXPLEN __IEEE_FLT_EXPLEN
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#undef __IEEE_DBL_FRACLEN
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#define __IEEE_DBL_FRACLEN __IEEE_FLT_FRACLEN
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#undef __IEEE_DBL_MAXPOWTWO
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#define __IEEE_DBL_MAXPOWTWO __IEEE_FLT_MAXPOWTWO
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#undef __IEEE_DBL_NAN_EXP
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#define __IEEE_DBL_NAN_EXP __IEEE_FLT_NAN_EXP
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#undef __ieee_double_shape_type
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#define __ieee_double_shape_type __ieee_float_shape_type
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#endif /* _DOUBLE_IS_32BITS */
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_END_STD_C
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#endif /* _IEEE_FP_H_ */
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