sysdeps/powerpc/powerpc64/power5/fpu/s_isnan.S

   1 /* isnan().  PowerPC64 version.
   2    Copyright (C) 2008-2014 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 power5
  24 EALIGN (__isnan, 4, 0)
  25         CALL_MCOUNT 0
  26         stfd    fp1,-8(r1)      /* copy FPR to GPR */
  27         lis     r0,0x7ff0
  28         nop                     /* insure the following is in a different */
  29         nop                     /* dispatch group */
  30         ld      r4,-8(r1)
  31         sldi    r0,r0,32        /* const long r0 0x7ff00000 00000000 */
  32         clrldi  r4,r4,1         /* x = fabs(x) */
  33         cmpd    cr7,r4,r0       /* if (fabs(x) <= inf) */
  34         li      r3,0            /* then return 0 */
  35         blelr+  cr7
  36         li      r3,1            /* else return 1 */
  37         blr
  38         END (__isnan)
  39
  40 hidden_def (__isnan)
  41 weak_alias (__isnan, isnan)
  42
  43 /* It turns out that the 'double' version will also always work for
  44    single-precision.  */
  45 strong_alias (__isnan, __isnanf)
  46 hidden_def (__isnanf)
  47 weak_alias (__isnanf, isnanf)
  48
  49 #ifdef NO_LONG_DOUBLE
  50 strong_alias (__isnan, __isnanl)
  51 weak_alias (__isnan, isnanl)
  52 #endif
  53
  54 #if !IS_IN (libm)
  55 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  56 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  57 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  58 # endif
  59 #endif
  60