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

   1 /* isnan().  PowerPC64 version.
   2    Copyright (C) 2008 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdep.h>
  21 #include <math_ldbl_opt.h>
  22
  23 /* int __isnan(x)  */
  24         .machine power5
  25 EALIGN (__isnan, 4, 0)
  26         CALL_MCOUNT 0
  27         stfd    fp1,-8(r1)      /* copy FPR to GPR */
  28         lis     r0,0x7ff0
  29         nop                     /* insure the following is in a different */
  30         nop                     /* dispatch group */
  31         ld      r4,-8(r1)
  32         sldi    r0,r0,32        /* const long r0 0x7ff00000 00000000 */
  33         clrldi  r4,r4,1         /* x = fabs(x) */
  34         cmpd    cr7,r4,r0       /* if (fabs(x) <= inf) */
  35         li      r3,0            /* then return 0 */
  36         blelr+  cr7
  37         li      r3,1            /* else return 1 */
  38         blr
  39         END (__isnan)
  40
  41 hidden_def (__isnan)
  42 weak_alias (__isnan, isnan)
  43
  44 /* It turns out that the 'double' version will also always work for
  45    single-precision.  */
  46 strong_alias (__isnan, __isnanf)
  47 hidden_def (__isnanf)
  48 weak_alias (__isnanf, isnanf)
  49
  50 #ifdef NO_LONG_DOUBLE
  51 strong_alias (__isnan, __isnanl)
  52 weak_alias (__isnan, isnanl)
  53 #endif
  54
  55 #ifndef IS_IN_libm
  56 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  57 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  58 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  59 # endif
  60 #endif
  61