398 lines
11 KiB
C
398 lines
11 KiB
C
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/* @(#)fdlibm.h 1.5 04/04/22 */
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/*
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* ====================================================
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* Copyright (C) 2004 by Sun Microsystems, Inc. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#ifndef __CLASSPATH_FDLIBM_H__
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#define __CLASSPATH_FDLIBM_H__
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/* AIX needs _XOPEN_SOURCE */
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#ifdef _AIX
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#define _XOPEN_SOURCE
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#endif
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#include <config.h>
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#include <stdlib.h>
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/* GCJ LOCAL: Include files. */
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#include "ieeefp.h"
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/* CLASSPATH LOCAL: */
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#include "namespace.h"
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#include "mprec.h"
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/* CYGNUS LOCAL: Default to XOPEN_MODE. */
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#define _XOPEN_MODE
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#ifdef __P
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#undef __P
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#endif
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/* Sometimes it's necessary to define __LITTLE_ENDIAN explicitly
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but these catch some common cases. */
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#if 0
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#if defined(i386) || defined(i486) || \
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defined(intel) || defined(x86) || defined(i86pc) || \
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defined(__alpha) || defined(__osf__)
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#define __LITTLE_ENDIAN
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#endif
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#ifdef __LITTLE_ENDIAN
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#define __HI(x) *(1+(int*)&x)
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#define __LO(x) *(int*)&x
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#define __HIp(x) *(1+(int*)x)
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#define __LOp(x) *(int*)x
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#else
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#define __HI(x) *(int*)&x
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#define __LO(x) *(1+(int*)&x)
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#define __HIp(x) *(int*)x
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#define __LOp(x) *(1+(int*)x)
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#endif
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#endif
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#ifdef __STDC__
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#define __P(p) p
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#else
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#define __P(p) ()
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#endif
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/*
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* ANSI/POSIX
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*/
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extern int signgam;
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#define MAXFLOAT ((float)3.40282346638528860e+38)
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enum fdversion {fdlibm_ieee = -1, fdlibm_svid, fdlibm_xopen, fdlibm_posix};
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#define _LIB_VERSION_TYPE enum fdversion
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#define _LIB_VERSION _fdlib_version
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/* if global variable _LIB_VERSION is not desirable, one may
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* change the following to be a constant by:
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* #define _LIB_VERSION_TYPE const enum version
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* In that case, after one initializes the value _LIB_VERSION (see
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* s_lib_version.c) during compile time, it cannot be modified
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* in the middle of a program
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*/
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extern _LIB_VERSION_TYPE _LIB_VERSION;
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#define _IEEE_ fdlibm_ieee
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#define _SVID_ fdlibm_svid
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#define _XOPEN_ fdlibm_xopen
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#define _POSIX_ fdlibm_posix
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struct exception {
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int type;
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char *name;
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double arg1;
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double arg2;
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double retval;
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};
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#define HUGE MAXFLOAT
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/*
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* set X_TLOSS = pi*2**52, which is possibly defined in <values.h>
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* (one may replace the following line by "#include <values.h>")
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*/
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#define X_TLOSS 1.41484755040568800000e+16
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#define DOMAIN 1
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#define SING 2
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#define OVERFLOW 3
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#define UNDERFLOW 4
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#define TLOSS 5
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#define PLOSS 6
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/* These typedefs are true for the targets running Java. */
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#define _IEEE_LIBM
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* ANSI/POSIX
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*/
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extern double acos __P((double));
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extern double asin __P((double));
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extern double atan __P((double));
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extern double atan2 __P((double, double));
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extern double cos __P((double));
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extern double sin __P((double));
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extern double tan __P((double));
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extern double cosh __P((double));
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extern double sinh __P((double));
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extern double tanh __P((double));
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extern double exp __P((double));
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extern double frexp __P((double, int *));
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extern double ldexp __P((double, int));
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extern double log __P((double));
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extern double log10 __P((double));
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extern double modf __P((double, double *));
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extern double pow __P((double, double));
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extern double sqrt __P((double));
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extern double ceil __P((double));
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extern double fabs __P((double));
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extern double floor __P((double));
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extern double fmod __P((double, double));
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extern double erf __P((double));
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extern double erfc __P((double));
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extern double gamma __P((double));
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extern double hypot __P((double, double));
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#if !defined(isnan)
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#define isnan(x) ((x) != (x))
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#endif
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extern int finite __P((double));
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extern double j0 __P((double));
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extern double j1 __P((double));
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extern double jn __P((int, double));
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extern double lgamma __P((double));
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extern double y0 __P((double));
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extern double y1 __P((double));
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extern double yn __P((int, double));
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extern double acosh __P((double));
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extern double asinh __P((double));
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extern double atanh __P((double));
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extern double cbrt __P((double));
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extern double logb __P((double));
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extern double nextafter __P((double, double));
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extern double remainder __P((double, double));
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#ifdef _SCALB_INT
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extern double scalb __P((double, int));
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#else
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extern double scalb __P((double, double));
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#endif
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extern int matherr __P((struct exception *));
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/*
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* IEEE Test Vector
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*/
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extern double significand __P((double));
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/*
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* Functions callable from C, intended to support IEEE arithmetic.
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*/
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extern double copysign __P((double, double));
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extern int ilogb __P((double));
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extern double rint __P((double));
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extern double scalbn __P((double, int));
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/*
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* BSD math library entry points
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*/
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extern double expm1 __P((double));
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extern double log1p __P((double));
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/*
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* Reentrant version of gamma & lgamma; passes signgam back by reference
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* as the second argument; user must allocate space for signgam.
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*/
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#ifdef _REENTRANT
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extern double gamma_r __P((double, int *));
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extern double lgamma_r __P((double, int *));
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#endif /* _REENTRANT */
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/* ieee style elementary functions */
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extern double __ieee754_sqrt __P((double));
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extern double __ieee754_acos __P((double));
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extern double __ieee754_acosh __P((double));
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extern double __ieee754_log __P((double));
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extern double __ieee754_atanh __P((double));
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extern double __ieee754_asin __P((double));
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extern double __ieee754_atan2 __P((double,double));
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extern double __ieee754_exp __P((double));
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extern double __ieee754_cosh __P((double));
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extern double __ieee754_fmod __P((double,double));
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extern double __ieee754_pow __P((double,double));
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extern double __ieee754_lgamma_r __P((double,int *));
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extern double __ieee754_gamma_r __P((double,int *));
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extern double __ieee754_lgamma __P((double));
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extern double __ieee754_gamma __P((double));
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extern double __ieee754_log10 __P((double));
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extern double __ieee754_sinh __P((double));
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extern double __ieee754_hypot __P((double,double));
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extern double __ieee754_j0 __P((double));
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extern double __ieee754_j1 __P((double));
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extern double __ieee754_y0 __P((double));
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extern double __ieee754_y1 __P((double));
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extern double __ieee754_jn __P((int,double));
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extern double __ieee754_yn __P((int,double));
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extern double __ieee754_remainder __P((double,double));
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extern int32_t __ieee754_rem_pio2 __P((double,double*));
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#ifdef _SCALB_INT
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extern double __ieee754_scalb __P((double,int));
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#else
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extern double __ieee754_scalb __P((double,double));
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#endif
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/* fdlibm kernel function */
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extern double __kernel_standard __P((double,double,int));
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extern double __kernel_sin __P((double,double,int));
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extern double __kernel_cos __P((double,double));
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extern double __kernel_tan __P((double,double,int));
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extern int __kernel_rem_pio2 __P((double*,double*,int,int,int,const int*));
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/* Classpath extensions */
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/* The original code used statements like
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n0 = ((*(int*)&one)>>29)^1; * index of high word *
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ix0 = *(n0+(int*)&x); * high word of x *
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ix1 = *((1-n0)+(int*)&x); * low word of x *
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to dig two 32 bit words out of the 64 bit IEEE floating point
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value. That is non-ANSI, and, moreover, the gcc instruction
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scheduler gets it wrong. We instead use the following macros.
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Unlike the original code, we determine the endianness at compile
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time, not at run time; I don't see much benefit to selecting
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endianness at run time. */
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#ifndef __IEEE_BIG_ENDIAN
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#ifndef __IEEE_LITTLE_ENDIAN
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#error Must define endianness
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#endif
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#endif
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/* A union which permits us to convert between a double and two 32 bit
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ints. */
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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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uint32_t msw;
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uint32_t lsw;
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} parts;
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} ieee_double_shape_type;
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#endif
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#ifdef __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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uint32_t lsw;
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uint32_t msw;
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} parts;
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} ieee_double_shape_type;
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#endif
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/* Get two 32 bit ints from a double. */
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#define EXTRACT_WORDS(ix0,ix1,d) \
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do { \
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ieee_double_shape_type ew_u; \
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ew_u.value = (d); \
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(ix0) = ew_u.parts.msw; \
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(ix1) = ew_u.parts.lsw; \
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} while (0)
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/* Get the more significant 32 bit int from a double. */
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#define GET_HIGH_WORD(i,d) \
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do { \
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ieee_double_shape_type gh_u; \
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gh_u.value = (d); \
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(i) = gh_u.parts.msw; \
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} while (0)
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/* Get the less significant 32 bit int from a double. */
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#define GET_LOW_WORD(i,d) \
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do { \
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ieee_double_shape_type gl_u; \
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gl_u.value = (d); \
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(i) = gl_u.parts.lsw; \
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} while (0)
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/* Set a double from two 32 bit ints. */
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#define INSERT_WORDS(d,ix0,ix1) \
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do { \
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ieee_double_shape_type iw_u; \
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iw_u.parts.msw = (ix0); \
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iw_u.parts.lsw = (ix1); \
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(d) = iw_u.value; \
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} while (0)
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/* Set the more significant 32 bits of a double from an int. */
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#define SET_HIGH_WORD(d,v) \
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do { \
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ieee_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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/* Set the less significant 32 bits of a double from an int. */
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#define SET_LOW_WORD(d,v) \
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do { \
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ieee_double_shape_type sl_u; \
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sl_u.value = (d); \
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sl_u.parts.lsw = (v); \
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(d) = sl_u.value; \
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} while (0)
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/* A union which permits us to convert between a float and a 32 bit
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int. */
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typedef union
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{
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float value;
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uint32_t word;
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} ieee_float_shape_type;
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/* Get a 32 bit int from a float. */
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#define GET_FLOAT_WORD(i,d) \
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do { \
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ieee_float_shape_type gf_u; \
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gf_u.value = (d); \
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(i) = gf_u.word; \
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} while (0)
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/* Set a float from a 32 bit int. */
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#define SET_FLOAT_WORD(d,i) \
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do { \
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ieee_float_shape_type sf_u; \
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sf_u.word = (i); \
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(d) = sf_u.value; \
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} while (0)
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CLASSPATH_FDLIBM_H__ */
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