sysdeps/alpha/fpu/bits/mathinline.h

   1 /* Inline math functions for Alpha.
   2    Copyright (C) 1996, 1997, 1999-2001, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by David Mosberger-Tang.
   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
  30
  31 #if defined __USE_ISOC99 && defined __GNUC__ && !__GNUC_PREREQ(3,0)
  32 # undef isgreater
  33 # undef isgreaterequal
  34 # undef isless
  35 # undef islessequal
  36 # undef islessgreater
  37 # undef isunordered
  38 # define isunordered(u, v)                              \
  39   (__extension__                                        \
  40    ({ double __r, __u = (u), __v = (v);                 \
  41       __asm ("cmptun/su %1,%2,%0\n\ttrapb"              \
  42              : "=&f" (__r) : "f" (__u), "f"(__v));      \
  43       __r != 0; }))
  44 #endif /* ISO C99 */
  45
  46 #if (!defined __NO_MATH_INLINES || defined __LIBC_INTERNAL_MATH_INLINES) \
  47     && defined __OPTIMIZE__
  48
  49 #define __inline_copysign(NAME, TYPE)                                   \
  50 __MATH_INLINE TYPE                                                      \
  51 __NTH (NAME (TYPE __x, TYPE __y))                                       \
  52 {                                                                       \
  53   TYPE __z;                                                             \
  54   __asm ("cpys %1, %2, %0" : "=f" (__z) : "f" (__y), "f" (__x));        \
  55   return __z;                                                           \
  56 }
  57
  58 __inline_copysign (__copysignf, float)
  59 __inline_copysign (copysignf, float)
  60 __inline_copysign (__copysign, double)
  61 __inline_copysign (copysign, double)
  62
  63 #undef __MATH_INLINE_copysign
  64
  65
  66 #if __GNUC_PREREQ (2, 8)
  67 __MATH_INLINE float
  68 __NTH (__fabsf (float __x)) { return __builtin_fabsf (__x); }
  69 __MATH_INLINE float
  70 __NTH (fabsf (float __x)) { return __builtin_fabsf (__x); }
  71 __MATH_INLINE double
  72 __NTH (__fabs (double __x)) { return __builtin_fabs (__x); }
  73 __MATH_INLINE double
  74 __NTH (fabs (double __x)) { return __builtin_fabs (__x); }
  75 #else
  76 # define __inline_fabs(NAME, TYPE)                      \
  77 __MATH_INLINE TYPE                                      \
  78 __NTH (NAME (TYPE __x))                                 \
  79 {                                                       \
  80   TYPE __z;                                             \
  81   __asm ("cpys $f31, %1, %0" : "=f" (__z) : "f" (__x)); \
  82   return __z;                                           \
  83 }
  84
  85 __inline_fabs (__fabsf, float)
  86 __inline_fabs (fabsf, float)
  87 __inline_fabs (__fabs, double)
  88 __inline_fabs (fabs, double)
  89
  90 # undef __inline_fabs
  91 #endif
  92
  93
  94 /* Use the -inf rounding mode conversion instructions to implement
  95    floor.  We note when the exponent is large enough that the value
  96    must be integral, as this avoids unpleasant integer overflows.  */
  97
  98 __MATH_INLINE float
  99 __NTH (__floorf (float __x))
 100 {
 101   /* Check not zero since floor(-0) == -0.  */
 102   if (__x != 0 && fabsf (__x) < 16777216.0f)  /* 1 << FLT_MANT_DIG */
 103     {
 104       /* Note that Alpha S_Floating is stored in registers in a
 105          restricted T_Floating format, so we don't even need to
 106          convert back to S_Floating in the end.  The initial
 107          conversion to T_Floating is needed to handle denormals.  */
 108
 109       float __tmp1, __tmp2;
 110
 111       __asm ("cvtst/s %3,%2\n\t"
 112 #ifdef _IEEE_FP_INEXACT
 113              "cvttq/svim %2,%1\n\t"
 114 #else
 115              "cvttq/svm %2,%1\n\t"
 116 #endif
 117              "cvtqt/m %1,%0\n\t"
 118              : "=f"(__x), "=&f"(__tmp1), "=&f"(__tmp2)
 119              : "f"(__x));
 120     }
 121   return __x;
 122 }
 123
 124 __MATH_INLINE double
 125 __NTH (__floor (double __x))
 126 {
 127   if (__x != 0 && fabs (__x) < 9007199254740992.0)  /* 1 << DBL_MANT_DIG */
 128     {
 129       double __tmp1;
 130       __asm (
 131 #ifdef _IEEE_FP_INEXACT
 132              "cvttq/svim %2,%1\n\t"
 133 #else
 134              "cvttq/svm %2,%1\n\t"
 135 #endif
 136              "cvtqt/m %1,%0\n\t"
 137              : "=f"(__x), "=&f"(__tmp1)
 138              : "f"(__x));
 139     }
 140   return __x;
 141 }
 142
 143 __MATH_INLINE float __NTH (floorf (float __x)) { return __floorf(__x); }
 144 __MATH_INLINE double __NTH (floor (double __x)) { return __floor(__x); }
 145
 146
 147 #ifdef __USE_ISOC99
 148
 149 __MATH_INLINE float
 150 __NTH (__fdimf (float __x, float __y))
 151 {
 152   return __x <= __y ? 0.0f : __x - __y;
 153 }
 154
 155 __MATH_INLINE float
 156 __NTH (fdimf (float __x, float __y))
 157 {
 158   return __x <= __y ? 0.0f : __x - __y;
 159 }
 160
 161 __MATH_INLINE double
 162 __NTH (__fdim (double __x, double __y))
 163 {
 164   return __x <= __y ? 0.0 : __x - __y;
 165 }
 166
 167 __MATH_INLINE double
 168 __NTH (fdim (double __x, double __y))
 169 {
 170   return __x <= __y ? 0.0 : __x - __y;
 171 }
 172
 173 /* Test for negative number.  Used in the signbit() macro.  */
 174 __MATH_INLINE int
 175 __NTH (__signbitf (float __x))
 176 {
 177   __extension__ union { float __f; int __i; } __u = { __f: __x };
 178   return __u.__i < 0;
 179 }
 180
 181 __MATH_INLINE int
 182 __NTH (__signbit (double __x))
 183 {
 184   __extension__ union { double __d; long __i; } __u = { __d: __x };
 185   return __u.__i < 0;
 186 }
 187
 188 #endif /* C99 */
 189
 190 #endif /* __NO_MATH_INLINES */