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 #if !__GNUC_PREREQ (4, 0)
  50 # define __inline_copysign(NAME, TYPE)                                  \
  51 __MATH_INLINE TYPE                                                      \
  52 __NTH (NAME (TYPE __x, TYPE __y))                                       \
  53 {                                                                       \
  54   TYPE __z;                                                             \
  55   __asm ("cpys %1, %2, %0" : "=f" (__z) : "f" (__y), "f" (__x));        \
  56   return __z;                                                           \
  57 }
  58
  59 __inline_copysign (__copysignf, float)
  60 __inline_copysign (copysignf, float)
  61 __inline_copysign (__copysign, double)
  62 __inline_copysign (copysign, double)
  63
  64 # undef __inline_copysign
  65 #endif
  66
  67
  68 #if !__GNUC_PREREQ (2, 8)
  69 # define __inline_fabs(NAME, TYPE)                      \
  70 __MATH_INLINE TYPE                                      \
  71 __NTH (NAME (TYPE __x))                                 \
  72 {                                                       \
  73   TYPE __z;                                             \
  74   __asm ("cpys $f31, %1, %0" : "=f" (__z) : "f" (__x)); \
  75   return __z;                                           \
  76 }
  77
  78 __inline_fabs (__fabsf, float)
  79 __inline_fabs (fabsf, float)
  80 __inline_fabs (__fabs, double)
  81 __inline_fabs (fabs, double)
  82
  83 # undef __inline_fabs
  84 #endif
  85
  86
  87 /* Use the -inf rounding mode conversion instructions to implement
  88    floor.  We note when the exponent is large enough that the value
  89    must be integral, as this avoids unpleasant integer overflows.  */
  90
  91 __MATH_INLINE float
  92 __NTH (__floorf (float __x))
  93 {
  94   /* Check not zero since floor(-0) == -0.  */
  95   if (__x != 0 && fabsf (__x) < 16777216.0f)  /* 1 << FLT_MANT_DIG */
  96     {
  97       /* Note that Alpha S_Floating is stored in registers in a
  98          restricted T_Floating format, so we don't even need to
  99          convert back to S_Floating in the end.  The initial
 100          conversion to T_Floating is needed to handle denormals.  */
 101
 102       float __tmp1, __tmp2;
 103
 104       __asm ("cvtst/s %3,%2\n\t"
 105 #ifdef _IEEE_FP_INEXACT
 106              "cvttq/svim %2,%1\n\t"
 107 #else
 108              "cvttq/svm %2,%1\n\t"
 109 #endif
 110              "cvtqt/m %1,%0\n\t"
 111              : "=f"(__x), "=&f"(__tmp1), "=&f"(__tmp2)
 112              : "f"(__x));
 113     }
 114   return __x;
 115 }
 116
 117 __MATH_INLINE double
 118 __NTH (__floor (double __x))
 119 {
 120   if (__x != 0 && fabs (__x) < 9007199254740992.0)  /* 1 << DBL_MANT_DIG */
 121     {
 122       double __tmp1;
 123       __asm (
 124 #ifdef _IEEE_FP_INEXACT
 125              "cvttq/svim %2,%1\n\t"
 126 #else
 127              "cvttq/svm %2,%1\n\t"
 128 #endif
 129              "cvtqt/m %1,%0\n\t"
 130              : "=f"(__x), "=&f"(__tmp1)
 131              : "f"(__x));
 132     }
 133   return __x;
 134 }
 135
 136 __MATH_INLINE float __NTH (floorf (float __x)) { return __floorf(__x); }
 137 __MATH_INLINE double __NTH (floor (double __x)) { return __floor(__x); }
 138
 139
 140 #ifdef __USE_ISOC99
 141
 142 __MATH_INLINE float
 143 __NTH (__fdimf (float __x, float __y))
 144 {
 145   return __x <= __y ? 0.0f : __x - __y;
 146 }
 147
 148 __MATH_INLINE float
 149 __NTH (fdimf (float __x, float __y))
 150 {
 151   return __x <= __y ? 0.0f : __x - __y;
 152 }
 153
 154 __MATH_INLINE double
 155 __NTH (__fdim (double __x, double __y))
 156 {
 157   return __x <= __y ? 0.0 : __x - __y;
 158 }
 159
 160 __MATH_INLINE double
 161 __NTH (fdim (double __x, double __y))
 162 {
 163   return __x <= __y ? 0.0 : __x - __y;
 164 }
 165
 166 /* Test for negative number.  Used in the signbit() macro.  */
 167 __MATH_INLINE int
 168 __NTH (__signbitf (float __x))
 169 {
 170   __extension__ union { float __f; int __i; } __u = { __f: __x };
 171   return __u.__i < 0;
 172 }
 173
 174 __MATH_INLINE int
 175 __NTH (__signbit (double __x))
 176 {
 177   __extension__ union { double __d; long __i; } __u = { __d: __x };
 178   return __u.__i < 0;
 179 }
 180
 181 #endif /* C99 */
 182
 183 #endif /* __NO_MATH_INLINES */