sysdeps/powerpc/fpu/bits/mathinline.h

   1 /* Inline math functions for powerpc.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2004, 2006
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _MATH_H
  22 # error "Never use <bits/mathinline.h> directly; include <math.h> instead."
  23 #endif
  24
  25 #ifdef __cplusplus
  26 # define __MATH_INLINE __inline
  27 #else
  28 # define __MATH_INLINE extern __inline
  29 #endif  /* __cplusplus */
  30
  31 #if defined __GNUC__ && !defined _SOFT_FLOAT
  32
  33 #ifdef __USE_ISOC99
  34 # if !__GNUC_PREREQ (2,97)
  35 #  define __unordered_cmp(x, y) \
  36   (__extension__                                                              \
  37    ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y);                       \
  38       unsigned __r;                                                           \
  39       __asm__("fcmpu 7,%1,%2 ; mfcr %0" : "=r" (__r) : "f" (__x), "f"(__y)    \
  40               : "cr7");  \
  41       __r; }))
  42
  43 #  undef isgreater
  44 #  undef isgreaterequal
  45 #  undef isless
  46 #  undef islessequal
  47 #  undef islessgreater
  48 #  undef isunordered
  49
  50 #  define isgreater(x, y) (__unordered_cmp (x, y) >> 2 & 1)
  51 #  define isgreaterequal(x, y) ((__unordered_cmp (x, y) & 6) != 0)
  52 #  define isless(x, y) (__unordered_cmp (x, y) >> 3 & 1)
  53 #  define islessequal(x, y) ((__unordered_cmp (x, y) & 0xA) != 0)
  54 #  define islessgreater(x, y) ((__unordered_cmp (x, y) & 0xC) != 0)
  55 #  define isunordered(x, y) (__unordered_cmp (x, y) & 1)
  56
  57 # endif /* __GNUC_PREREQ (2,97) */
  58
  59 /* The gcc, version 2.7 or below, has problems with all this inlining
  60    code.  So disable it for this version of the compiler.  */
  61 # if __GNUC_PREREQ (2, 8)
  62 /* Test for negative number.  Used in the signbit() macro.  */
  63 __MATH_INLINE int
  64 __NTH (__signbitf (float __x))
  65 {
  66   __extension__ union { float __f; int __i; } __u = { __f: __x };
  67   return __u.__i < 0;
  68 }
  69 __MATH_INLINE int
  70 __NTH (__signbit (double __x))
  71 {
  72   __extension__ union { double __d; int __i[2]; } __u = { __d: __x };
  73   return __u.__i[0] < 0;
  74 }
  75 # endif
  76 #endif /* __USE_ISOC99 */
  77
  78 #if !defined __NO_MATH_INLINES && defined __OPTIMIZE__
  79
  80 #ifdef __USE_ISOC99
  81
  82 # ifndef __powerpc64__
  83 __MATH_INLINE long int lrint (double __x) __THROW;
  84 __MATH_INLINE long int
  85 __NTH (lrint (double __x))
  86 {
  87   union {
  88     double __d;
  89     int __ll[2];
  90   } __u;
  91   __asm__ ("fctiw %0,%1" : "=f"(__u.__d) : "f"(__x));
  92   return __u.__ll[1];
  93 }
  94
  95 __MATH_INLINE long int lrintf (float __x) __THROW;
  96 __MATH_INLINE long int
  97 __NTH (lrintf (float __x))
  98 {
  99   union {
 100     double __d;
 101     int __ll[2];
 102   } __u;
 103   __asm__ ("fctiw %0,%1" : "=f"(__u.__d) : "f"(__x));
 104   return __u.__ll[1];
 105 }
 106 # endif
 107
 108 __MATH_INLINE double fdim (double __x, double __y) __THROW;
 109 __MATH_INLINE double
 110 __NTH (fdim (double __x, double __y))
 111 {
 112   return __x <= __y ? 0 : __x - __y;
 113 }
 114
 115 __MATH_INLINE float fdimf (float __x, float __y) __THROW;
 116 __MATH_INLINE float
 117 __NTH (fdimf (float __x, float __y))
 118 {
 119   return __x <= __y ? 0 : __x - __y;
 120 }
 121
 122 #endif /* __USE_ISOC99 */
 123 #endif /* !__NO_MATH_INLINES && __OPTIMIZE__ */
 124
 125 /* This code is used internally in the GNU libc.  */
 126 #ifdef __LIBC_INTERNAL_MATH_INLINES
 127
 128 #include <sysdep.h>
 129 #include <ldsodefs.h>
 130 #include <dl-procinfo.h>
 131
 132 # if __WORDSIZE == 64 || defined _ARCH_PWR4
 133 #  define __CPU_HAS_FSQRT 1
 134 # else
 135 #  define __CPU_HAS_FSQRT ((GLRO(dl_hwcap) & PPC_FEATURE_64) != 0)
 136 # endif
 137
 138 extern double __slow_ieee754_sqrt (double);
 139 __MATH_INLINE double
 140 __NTH (__ieee754_sqrt (double __x))
 141 {
 142   double __z;
 143
 144   /* If the CPU is 64-bit we can use the optional FP instructions.  */
 145   if (__CPU_HAS_FSQRT)
 146   {
 147     /* Volatile is required to prevent the compiler from moving the
 148        fsqrt instruction above the branch.  */
 149      __asm __volatile (
 150         "       fsqrt   %0,%1\n"
 151                 : "=f" (__z)
 152                 : "f" (__x));
 153   }
 154   else
 155      __z = __slow_ieee754_sqrt(__x);
 156
 157   return __z;
 158 }
 159
 160 extern float __slow_ieee754_sqrtf (float);
 161 __MATH_INLINE float
 162 __NTH (__ieee754_sqrtf (float __x))
 163 {
 164   float __z;
 165
 166   /* If the CPU is 64-bit we can use the optional FP instructions.  */
 167   if (__CPU_HAS_FSQRT)
 168   {
 169     /* Volatile is required to prevent the compiler from moving the
 170        fsqrts instruction above the branch.  */
 171      __asm __volatile (
 172         "       fsqrts  %0,%1\n"
 173                 : "=f" (__z)
 174                 : "f" (__x));
 175   }
 176   else
 177      __z = __slow_ieee754_sqrtf(__x);
 178
 179   return __z;
 180 }
 181 #endif /* __LIBC_INTERNAL_MATH_INLINES */
 182 #endif /* __GNUC__ && !_SOFT_FLOAT */