sysdeps/powerpc/fpu/math_private.h

   1 /* Private inline math functions for powerpc.
   2    Copyright (C) 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., 51 Franklin St - Fifth Floor, Boston,
  19    MA 02110-1301 USA  */
  20
  21 #ifndef _PPC_MATH_PRIVATE_H_
  22 #define _PPC_MATH_PRIVATE_H_
  23
  24 #include <sysdep.h>
  25 #include <ldsodefs.h>
  26 #include <dl-procinfo.h>
  27
  28 # if __WORDSIZE == 64 || defined _ARCH_PWR4
  29 #  define __CPU_HAS_FSQRT 1
  30 # else
  31 #  define __CPU_HAS_FSQRT ((GLRO(dl_hwcap) & PPC_FEATURE_64) != 0)
  32 # endif
  33
  34 # ifndef __LIBC_INTERNAL_MATH_INLINES
  35 extern double __slow_ieee754_sqrt (double);
  36 __inline double
  37 __ieee754_sqrt (double __x)
  38 {
  39   double __z;
  40
  41   /* If the CPU is 64-bit we can use the optional FP instructions.  */
  42   if (__CPU_HAS_FSQRT)
  43   {
  44     /* Volatile is required to prevent the compiler from moving the
  45        fsqrt instruction above the branch.  */
  46      __asm __volatile (
  47         "       fsqrt   %0,%1\n"
  48                 : "=f" (__z)
  49                 : "f" (__x));
  50   }
  51   else
  52      __z = __slow_ieee754_sqrt(__x);
  53
  54   return __z;
  55 }
  56
  57 extern float __slow_ieee754_sqrtf (float);
  58
  59 __inline float
  60 __ieee754_sqrtf (float __x)
  61 {
  62   float __z;
  63
  64   /* If the CPU is 64-bit we can use the optional FP instructions.  */
  65   if (__CPU_HAS_FSQRT)
  66   {
  67     /* Volatile is required to prevent the compiler from moving the
  68        fsqrts instruction above the branch.  */
  69      __asm __volatile (
  70         "       fsqrts  %0,%1\n"
  71                 : "=f" (__z)
  72                 : "f" (__x));
  73   }
  74   else
  75      __z = __slow_ieee754_sqrtf(__x);
  76
  77   return __z;
  78 }
  79 #endif /* __LIBC_INTERNAL_MATH_INLINES */
  80
  81 #include <math/math_private.h>
  82
  83 #endif /* _PPC_MATH_PRIVATE_H_ */