sysdeps/powerpc/powerpc64/power6/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 power6
  24 ENTRY_TOCLESS (__isnan, 4)
  25         CALL_MCOUNT 0
  26         stfd    fp1,-8(r1)      /* copy FPR to GPR */
  27         ori     r1,r1,0
  28         ld      r4,-8(r1)
  29         lis     r0,0x7ff0
  30         sldi    r0,r0,32        /* const long r0 0x7ff00000 00000000 */
  31         clrldi  r4,r4,1         /* x = fabs(x) */
  32         cmpd    cr7,r4,r0       /* if (fabs(x) <= inf) */
  33         li      r3,0            /* then return 0 */
  34         blelr+  cr7
  35         li      r3,1            /* else return 1 */
  36         blr
  37         END (__isnan)
  38
  39 hidden_def (__isnan)
  40 weak_alias (__isnan, isnan)
  41
  42 /* It turns out that the 'double' version will also always work for
  43    single-precision.  */
  44 strong_alias (__isnan, __isnanf)
  45 hidden_def (__isnanf)
  46 weak_alias (__isnanf, isnanf)
  47
  48 #ifdef NO_LONG_DOUBLE
  49 strong_alias (__isnan, __isnanl)
  50 weak_alias (__isnan, isnanl)
  51 #endif
  52
  53 #if !IS_IN (libm)
  54 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  55 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  56 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  57 # endif
  58 #endif
  59