sysdeps/powerpc/fpu/s_float_bitwise.h

   1 /* Bitwise manipulation over float. Function prototypes.
   2    Copyright (C) 2011-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
   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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _FLOAT_BITWISE_
  21 #define _FLOAT_BITWISE_ 1
  22
  23 #include <math_private.h>
  24
  25 /* Returns (int)(num & 0x7FFFFFF0 == value) */
  26 static inline int
  27 __float_and_test28 (float num, float value)
  28 {
  29   float ret;
  30 #ifdef _ARCH_PWR7
  31   union {
  32     int i;
  33     float f;
  34   } mask = { .i = 0x7ffffff0 };
  35   __asm__ (
  36   /* the 'f' constraint is used on mask because we just need
  37    * to compare floats, not full vector */
  38     "xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
  39   );
  40 #else
  41   int32_t inum;
  42   GET_FLOAT_WORD(inum, num);
  43   inum = (inum & 0x7ffffff0);
  44   SET_FLOAT_WORD(ret, inum);
  45 #endif
  46   return (ret == value);
  47 }
  48
  49 /* Returns (int)(num & 0x7FFFFF00 == value) */
  50 static inline int
  51 __float_and_test24 (float num, float value)
  52 {
  53   float ret;
  54 #ifdef _ARCH_PWR7
  55   union {
  56     int i;
  57     float f;
  58   } mask = { .i = 0x7fffff00 };
  59   __asm__ (
  60     "xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
  61   );
  62 #else
  63   int32_t inum;
  64   GET_FLOAT_WORD(inum, num);
  65   inum = (inum & 0x7fffff00);
  66   SET_FLOAT_WORD(ret, inum);
  67 #endif
  68   return (ret == value);
  69 }
  70
  71 /* Returns (float)(num & 0x7F800000) */
  72 static inline float
  73 __float_and8 (float num)
  74 {
  75   float ret;
  76 #ifdef _ARCH_PWR7
  77   union {
  78     int i;
  79     float f;
  80   } mask = { .i = 0x7f800000 };
  81   __asm__ (
  82     "xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
  83   );
  84 #else
  85   int32_t inum;
  86   GET_FLOAT_WORD(inum, num);
  87   inum = (inum & 0x7f800000);
  88   SET_FLOAT_WORD(ret, inum);
  89 #endif
  90   return ret;
  91 }
  92
  93 /* Returns ((int32_t)(num & 0x7F800000) >> 23) */
  94 static inline int32_t
  95 __float_get_exp (float num)
  96 {
  97   int32_t inum;
  98 #ifdef _ARCH_PWR7
  99   float ret;
 100   union {
 101     int i;
 102     float f;
 103   } mask = { .i = 0x7f800000 };
 104   __asm__ (
 105     "xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
 106   );
 107   GET_FLOAT_WORD(inum, ret);
 108 #else
 109   GET_FLOAT_WORD(inum, num);
 110   inum = inum & 0x7f800000;
 111 #endif
 112   return inum >> 23;
 113 }
 114
 115 #endif /* s_float_bitwise.h */