sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S

   1 /* isnan().  PowerPC64/POWER8 version.
   2    Copyright (C) 2014-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <math_ldbl_opt.h>
  21
  22 #define MFVSRD_R3_V1  .long 0x7c230066     /* mfvsrd  r3,vs1  */
  23
  24 /* int [r3] __isnan([f1] x)  */
  25
  26 EALIGN (__isnan, 4, 0)
  27         CALL_MCOUNT 0
  28         MFVSRD_R3_V1
  29         lis     r9,0x7ff0
  30         clrldi  r3,r3,1       /* r3 = r3 & 0x8000000000000000  */
  31         rldicr  r9,r9,32,31   /* r9 = (r9 << 32) & 0xffffffff  */
  32         subf    r3,r3,r9
  33         rldicl  r3,r3,1,63
  34         blr
  35 END (__isnan)
  36
  37 hidden_def (__isnan)
  38 weak_alias (__isnan, isnan)
  39
  40 /* It turns out that the 'double' version will also always work for
  41    single-precision.  */
  42 strong_alias (__isnan, __isnanf)
  43 hidden_def (__isnanf)
  44 weak_alias (__isnanf, isnanf)
  45
  46 #ifdef NO_LONG_DOUBLE
  47 strong_alias (__isnan, __isnanl)
  48 weak_alias (__isnan, isnanl)
  49 #endif
  50
  51 #if !IS_IN (libm)
  52 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  53 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  54 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  55 # endif
  56 #endif