sysdeps/powerpc/powerpc64/fpu/s_isnan.S

   1 /* isnan().  PowerPC64 version.
   2    Copyright (C) 2008-2019 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 /* int __isnan(x)  */
  23         .machine power4
  24 ENTRY_TOCLESS (__isnan, 4)
  25         CALL_MCOUNT 0
  26         mffs    fp0
  27         mtfsb0  4*cr6+lt /* reset_fpscr_bit (FPSCR_VE) */
  28         fcmpu   cr7,fp1,fp1
  29         mtfsf   255,fp0
  30         li      r3,0
  31         beqlr+  cr7     /* (x == x) then not a NAN */
  32         li      r3,1    /* else must be a NAN */
  33         blr
  34         END (__isnan)
  35
  36 hidden_def (__isnan)
  37 weak_alias (__isnan, isnan)
  38
  39 /* It turns out that the 'double' version will also always work for
  40    single-precision.  */
  41 strong_alias (__isnan, __isnanf)
  42 hidden_def (__isnanf)
  43 weak_alias (__isnanf, isnanf)
  44
  45 #ifdef NO_LONG_DOUBLE
  46 strong_alias (__isnan, __isnanl)
  47 weak_alias (__isnan, isnanl)
  48 #endif
  49
  50 #if !IS_IN (libm)
  51 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  52 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  53 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  54 # endif
  55 #endif
  56