mathinline.h

Glibc 2.3.2源代码(解压后有100多M)

/* Definitions of inline math functions implemented by the m68881/2.
   Copyright (C) 1991,92,93,94,96,97,98,99,2000,2002 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifdef	__GNUC__

#ifdef __USE_ISOC99

# if __GNUC_PREREQ (3,1)
/* GCC 3.1 and up have builtins that actually can be used.  */
#  define isgreater(x, y) __builtin_isgreater (x, y)
#  define isgreaterequal(x, y) __builtin_isgreaterequal (x, y)
#  define isless(x, y) __builtin_isless (x, y)
#  define islessequal(x, y) __builtin_islessequal (x, y)
#  define islessgreater(x, y) __builtin_islessgreater (x, y)
#  define isunordered(x, y) __builtin_isunordered (x, y)
# else
/* ISO C99 defines some macros to perform unordered comparisons.  The
   m68k FPU supports this with special opcodes and we should use them.
   These must not be inline functions since we have to be able to handle
   all floating-point types.  */
#  define isgreater(x, y)					\
   __extension__					\
   ({ char __result;					\
      __asm__ ("fcmp%.x %2,%1; fsogt %0"		\
	       : "=dm" (__result) : "f" (x), "f" (y));	\
      __result != 0; })

#  define isgreaterequal(x, y)				\
   __extension__					\
   ({ char __result;					\
      __asm__ ("fcmp%.x %2,%1; fsoge %0"		\
	       : "=dm" (__result) : "f" (x), "f" (y));	\
      __result != 0; })

#  define isless(x, y)					\
   __extension__					\
   ({ char __result;					\
      __asm__ ("fcmp%.x %2,%1; fsolt %0"		\
	       : "=dm" (__result) : "f" (x), "f" (y));	\
      __result != 0; })

#  define islessequal(x, y)				\
   __extension__					\
   ({ char __result;					\
      __asm__ ("fcmp%.x %2,%1; fsole %0"		\
	       : "=dm" (__result) : "f" (x), "f" (y));	\
      __result != 0; })

#  define islessgreater(x, y)				\
   __extension__					\
   ({ char __result;					\
      __asm__ ("fcmp%.x %2,%1; fsogl %0"		\
	       : "=dm" (__result) : "f" (x), "f" (y));	\
      __result != 0; })

#  define isunordered(x, y)				\
   __extension__					\
   ({ char __result;					\
      __asm__ ("fcmp%.x %2,%1; fsun %0"			\
	       : "=dm" (__result) : "f" (x), "f" (y));	\
      __result != 0; })
# endif /* GCC 3.1 */
#endif


#if (!defined __NO_MATH_INLINES && defined __OPTIMIZE__) \
    || defined __LIBC_INTERNAL_MATH_INLINES

#ifdef	__LIBC_INTERNAL_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
# ifdef __cplusplus
#  define __m81_inline		__inline
# else
#  define __m81_inline		extern __inline
# endif
# 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).  */

#if defined __USE_MISC || defined __USE_ISOC99
# 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)) __THROW	      \
  {									      \
    float_type __result;						      \
    __asm("f" __STRING(op) "%.x %1, %0" : "=f" (__result) : "f" (__mathop_x));\
    return __result;							      \
  }

__inline_mathop(__atan, atan)
__inline_mathop(__cos, cos)
__inline_mathop(__sin, sin)
__inline_mathop(__tan, tan)
__inline_mathop(__tanh, tanh)
__inline_mathop(__fabs, abs)

#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
__inline_mathop(__rint, int)
__inline_mathop(__expm1, etoxm1)
__inline_mathop(__log1p, lognp1)
#endif

#ifdef __USE_MISC
__inline_mathop(__significand, getman)
#endif

#ifdef __USE_ISOC99
__inline_mathop(__trunc, intrz)
#endif

#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)

# if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
__inline_mathop(rint, int)
__inline_mathop(expm1, etoxm1)
__inline_mathop(log1p, lognp1)
# endif

# ifdef __USE_MISC
__inline_mathop(significand, getman)
# endif

# ifdef __USE_ISOC99
__inline_mathop(trunc, intrz)
# 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.  */

#define __inline_functions(float_type, s)				  \
__m81_inline float_type							  \
__m81_u(__CONCAT(__frexp,s))(float_type __value, int *__expptr)	__THROW	  \
{									  \
  float_type __mantissa, __exponent;					  \
  int __iexponent;							  \
  unsigned long __fpsr;							  \
  __asm("ftst%.x %1\n"							  \
	"fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value));	  \
  if (__fpsr & (7 << 24))						  \
    {									  \
      /* Not finite or zero.  */					  \
      *__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))	__THROW	  \
{									  \
  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)) __THROW	  \
{									  \
  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;							  \
}

__inline_functions(double,)
#if defined __USE_MISC || defined __USE_ISOC99
__inline_functions(float,f)
__inline_functions(long double,l)
#endif
#undef __inline_functions