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/* Definitions of inline math functions implemented by the m68881/2.
Copyright (C) 1991, 92, 93, 94, 96, 97 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifdef __GNUC__
#include <sys/cdefs.h>
#ifdef __LIBC_M81_MATH_INLINES
/* This is used when defining the functions themselves. Define them with
__ names, and with `static inline' instead of `extern inline' so the
bodies will always be used, never an external function call. */
#define __m81_u(x) __CONCAT(__,x)
#define __m81_inline static __inline
#else
#define __m81_u(x) x
#define __m81_inline extern __inline
#define __M81_MATH_INLINES 1
#endif
/* Define a const math function. */
#define __m81_defun(rettype, func, args) \
__m81_inline rettype __attribute__((__const__)) \
__m81_u(func) args
/* Define the three variants of a math function that has a direct
implementation in the m68k fpu. FUNC is the name for C (which will be
suffixed with f and l for the float and long double version, resp). OP
is the name of the fpu operation (without leading f). */
#ifdef __USE_MISC
#define __inline_mathop(func, op) \
__inline_mathop1(double, func, op) \
__inline_mathop1(float, __CONCAT(func,f), op) \
__inline_mathop1(long double, __CONCAT(func,l), op)
#else
#define __inline_mathop(func, op) \
__inline_mathop1(double, func, op)
#endif
#define __inline_mathop1(float_type,func, op) \
__m81_defun (float_type, func, (float_type __mathop_x)) \
{ \
float_type __result; \
__asm("f" __STRING(op) "%.x %1, %0" : "=f" (__result) : "f" (__mathop_x));\
return __result; \
}
#ifdef __LIBC_M81_MATH_INLINES
/* ieee style elementary functions */
/* These are internal to the implementation of libm. */
__inline_mathop(__ieee754_acos, acos)
__inline_mathop(__ieee754_asin, asin)
__inline_mathop(__ieee754_cosh, cosh)
__inline_mathop(__ieee754_sinh, sinh)
__inline_mathop(__ieee754_exp, etox)
__inline_mathop(__ieee754_log10, log10)
__inline_mathop(__ieee754_log, logn)
__inline_mathop(__ieee754_sqrt, sqrt)
__inline_mathop(__ieee754_atanh, atanh)
#endif
__inline_mathop(__atan, atan)
__inline_mathop(__cos, cos)
__inline_mathop(__sin, sin)
__inline_mathop(__tan, tan)
__inline_mathop(__tanh, tanh)
__inline_mathop(__fabs, abs)
__inline_mathop(__sqrt, sqrt)
__inline_mathop(__rint, int)
__inline_mathop(__expm1, etoxm1)
__inline_mathop(__log1p, lognp1)
__inline_mathop(__logb, log2)
__inline_mathop(__significand, getman)
#if !defined __NO_MATH_INLINES && defined __OPTIMIZE__
__inline_mathop(atan, atan)
__inline_mathop(cos, cos)
__inline_mathop(sin, sin)
__inline_mathop(tan, tan)
__inline_mathop(tanh, tanh)
__inline_mathop(fabs, abs)
__inline_mathop(sqrt, sqrt)
#if defined(__USE_MISC) || defined(__USE_XOPEN_EXTENDED)
__inline_mathop(rint, int)
__inline_mathop(expm1, etoxm1)
__inline_mathop(log1p, lognp1)
__inline_mathop(logb, log2)
#endif
#ifdef __USE_MISC
__inline_mathop(significand, getman)
#endif
#endif /* !__NO_MATH_INLINES && __OPTIMIZE__ */
/* This macro contains the definition for the rest of the inline
functions, using __FLOAT_TYPE as the domain type and __S as the suffix
for the function names. */
#ifdef __LIBC_M81_MATH_INLINES
/* Internally used functions. */
#define __internal_inline_functions(float_type, s) \
__m81_defun (float_type, __CONCAT(__ieee754_remainder,s), \
(float_type __x, float_type __y)) \
{ \
float_type __result; \
__asm("frem%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x)); \
return __result; \
} \
\
__m81_defun (float_type, __CONCAT(__ieee754_fmod,s), \
(float_type __x, float_type __y)) \
{ \
float_type __result; \
__asm("fmod%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x)); \
return __result; \
} \
\
__m81_defun (float_type, __CONCAT(__ieee754_atan2,s), \
(float_type __y, float_type __x)) \
{ \
float_type __pi, __pi_2; \
\
__asm ("fmovecr%.x %#0, %0" : "=f" (__pi)); \
__asm ("fscale%.w %#-1, %0" : "=f" (__pi_2) : "0" (__pi)); \
if (__x > 0) \
{ \
if (__y > 0) \
{ \
if (__x > __y) \
return __m81_u(__CONCAT(__atan,s)) (__y / __x); \
else \
return __pi_2 - __m81_u(__CONCAT(__atan,s)) (__x / __y); \
} \
else \
{ \
if (__x > -__y) \
return __m81_u(__CONCAT(__atan,s)) (__y / __x); \
else \
return -__pi_2 - __m81_u(__CONCAT(__atan,s)) (__x / __y); \
} \
} \
else \
{ \
if (__y > 0) \
{ \
if (-__x < __y) \
return __pi + __m81_u(__CONCAT(__atan,s)) (__y / __x); \
else \
return __pi_2 - __m81_u(__CONCAT(__atan,s)) (__x / __y); \
} \
else \
{ \
if (-__x > -__y) \
return -__pi + __m81_u(__CONCAT(__atan,s)) (__y / __x); \
else \
return -__pi_2 - __m81_u(__CONCAT(__atan,s)) (__x / __y); \
} \
} \
} \
\
__m81_defun (float_type, __CONCAT(__ieee754_pow,s), \
(float_type __x, float_type __y)) \
{ \
float_type __result; \
if (__x == 0.0) \
{ \
if (__y <= 0.0) \
__result = 0.0 / 0.0; \
else \
__result = 0.0; \
} \
else if (__y == 0.0 || __x == 1.0) \
__result = 1.0; \
else if (__y == 1.0) \
__result = __x; \
else if (__y == 2.0) \
__result = __x * __x; \
else if (__x == 10.0) \
__asm("ftentox%.x %1, %0" : "=f" (__result) : "f" (__y)); \
else if (__x == 2.0) \
__asm("ftwotox%.x %1, %0" : "=f" (__result) : "f" (__y)); \
else if (__x < 0.0) \
{ \
float_type __temp = __m81_u (__CONCAT(__rint,s)) (__y); \
if (__y == __temp) \
{ \
int __i = (int) __y; \
__result = (__m81_u(__CONCAT(__ieee754_exp,s)) \
(__y * __m81_u(__CONCAT(__ieee754_log,s)) (-__x))); \
if (__i & 1) \
__result = -__result; \
} \
else \
__result = 0.0 / 0.0; \
} \
else \
__result = (__m81_u(__CONCAT(__ieee754_exp,s)) \
(__y * __m81_u(__CONCAT(__ieee754_log,s)) (__x))); \
return __result; \
} \
\
__m81_defun (float_type, __CONCAT(__ieee754_scalb,s), \
(float_type __x, float_type __n)) \
{ \
float_type __result; \
__asm ("fscale%.x %1, %0" : "=f" (__result) : "f" (__n), "0" (__x)); \
return __result; \
}
__internal_inline_functions (double,)
__internal_inline_functions (float,f)
__internal_inline_functions (long double,l)
#undef __internal_inline_functions
#endif /* __LIBC_M81_MATH_INLINES */
/* The rest of the functions are available to the user. */
#define __inline_functions(float_type, s) \
__m81_inline float_type \
__m81_u(__CONCAT(__frexp,s))(float_type __value, int *__expptr) \
{ \
float_type __mantissa, __exponent; \
int __iexponent; \
if (__value == 0.0) \
{ \
*__expptr = 0; \
return __value; \
} \
__asm("fgetexp%.x %1, %0" : "=f" (__exponent) : "f" (__value)); \
__iexponent = (int) __exponent + 1; \
*__expptr = __iexponent; \
__asm("fscale%.l %2, %0" : "=f" (__mantissa) \
: "0" (__value), "dmi" (-__iexponent)); \
return __mantissa; \
} \
\
__m81_defun (float_type, __CONCAT(__floor,s), (float_type __x)) \
{ \
float_type __result; \
unsigned long int __ctrl_reg; \
__asm __volatile__ ("fmove%.l %!, %0" : "=dm" (__ctrl_reg)); \
/* Set rounding towards negative infinity. */ \
__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
: "dmi" ((__ctrl_reg & ~0x10) | 0x20)); \
/* Convert X to an integer, using -Inf rounding. */ \
__asm __volatile__ ("fint%.x %1, %0" : "=f" (__result) : "f" (__x)); \
/* Restore the previous rounding mode. */ \
__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
: "dmi" (__ctrl_reg)); \
return __result; \
} \
\
__m81_defun (float_type, __CONCAT(__ceil,s), (float_type __x)) \
{ \
float_type __result; \
unsigned long int __ctrl_reg; \
__asm __volatile__ ("fmove%.l %!, %0" : "=dm" (__ctrl_reg)); \
/* Set rounding towards positive infinity. */ \
__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
: "dmi" (__ctrl_reg | 0x30)); \
/* Convert X to an integer, using +Inf rounding. */ \
__asm __volatile__ ("fint%.x %1, %0" : "=f" (__result) : "f" (__x)); \
/* Restore the previous rounding mode. */ \
__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
: "dmi" (__ctrl_reg)); \
return __result; \
} \
\
__m81_inline float_type \
__m81_u(__CONCAT(__modf,s))(float_type __value, float_type *__iptr) \
{ \
float_type __modf_int; \
__asm ("fintrz%.x %1, %0" : "=f" (__modf_int) : "f" (__value)); \
*__iptr = __modf_int; \
return __value - __modf_int; \
} \
\
__m81_defun (int, __CONCAT(__isinf,s), (float_type __value)) \
{ \
/* There is no branch-condition for infinity, \
so we must extract and examine the condition codes manually. */ \
unsigned long int __fpsr; \
__asm("ftst%.x %1\n" \
"fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value)); \
return (__fpsr & (2 << 24)) ? (__fpsr & (8 << 24) ? -1 : 1) : 0; \
} \
\
__m81_defun (int, __CONCAT(__isnan,s), (float_type __value)) \
{ \
char __result; \
__asm("ftst%.x %1\n" \
"fsun %0" : "=dm" (__result) : "f" (__value)); \
return __result; \
} \
\
__m81_defun (int, __CONCAT(__finite,s), (float_type __value)) \
{ \
/* There is no branch-condition for infinity, so we must extract and \
examine the condition codes manually. */ \
unsigned long int __fpsr; \
__asm ("ftst%.x %1\n" \
"fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value)); \
return (__fpsr & (3 << 24)) == 0; \
} \
\
__m81_defun (int, __CONCAT(__ilogb,s), (float_type __x)) \
{ \
float_type __result; \
if (__x == 0.0) \
return 0x80000001; \
__asm("fgetexp%.x %1, %0" : "=f" (__result) : "f" (__x)); \
return (int) __result; \
} \
\
__m81_defun (float_type, __CONCAT(__scalbn,s), (float_type __x, int __n)) \
{ \
float_type __result; \
__asm ("fscale%.l %1, %0" : "=f" (__result) : "dmi" (__n), "0" (__x)); \
return __result; \
}
/* This defines the three variants of the inline functions. */
__inline_functions (double,)
__inline_functions (float,f)
__inline_functions (long double,l)
#undef __inline_functions
#if !defined __NO_MATH_INLINES && defined __OPTIMIZE__
/* Define inline versions of the user visible functions. */
#define __inline_forward_c(rettype, name, args1, args2) \
extern __inline rettype __attribute__((__const__)) \
name args1 \
{ \
return __CONCAT(__,name) args2; \
}
#define __inline_forward(rettype, name, args1, args2) \
extern __inline rettype name args1 \
{ \
return __CONCAT(__,name) args2; \
}
__inline_forward(double,frexp, (double __value, int *__expptr),
(__value, __expptr))
__inline_forward_c(double,floor, (double __x), (__x))
__inline_forward_c(double,ceil, (double __x), (__x))
__inline_forward(double,modf, (double __value, double *__iptr),
(__value, __iptr))
#ifdef __USE_MISC
__inline_forward_c(int,isinf, (double __value), (__value))
__inline_forward_c(int,finite, (double __value), (__value))
__inline_forward_c(double,scalbn, (double __x, int __n), (__x, __n))
#endif
#if defined __USE_MISC || defined __USE_XOPEN
__inline_forward_c(int,isnan, (double __value), (__value))
__inline_forward_c(int,ilogb, (double __value), (__value))
#endif
#ifdef __USE_MISC
__inline_forward(float,frexpf, (float __value, int *__expptr),
(__value, __expptr))
__inline_forward_c(float,floorf, (float __x), (__x))
__inline_forward_c(float,ceilf, (float __x), (__x))
__inline_forward(float,modff, (float __value, float *__iptr),
(__value, __iptr))
__inline_forward_c(int,isinff, (float __value), (__value))
__inline_forward_c(int,finitef, (float __value), (__value))
__inline_forward_c(float,scalbnf, (float __x, int __n), (__x, __n))
__inline_forward_c(int,isnanf, (float __value), (__value))
__inline_forward_c(int,ilogbf, (float __value), (__value))
__inline_forward(long double,frexpl, (long double __value, int *__expptr),
(__value, __expptr))
__inline_forward_c(long double,floorl, (long double __x), (__x))
__inline_forward_c(long double,ceill, (long double __x), (__x))
__inline_forward(long double,modfl,
(long double __value, long double *__iptr),
(__value, __iptr))
__inline_forward_c(int,isinfl, (long double __value), (__value))
__inline_forward_c(int,finitel, (long double __value), (__value))
__inline_forward_c(long double,scalbnl, (long double __x, int __n),
(__x, __n))
__inline_forward_c(int,isnanl, (long double __value), (__value))
__inline_forward_c(int,ilogbl, (long double __value), (__value))
#endif /* __USE_MISC */
#undef __inline_forward
#undef __inline_forward_c
#endif /* !__NO_MATH_INLINES && __OPTIMIZE__ */
#endif /* GCC. */
|
