sysdeps/powerpc/powerpc32/power6/fpu/s_isnan.S

   1 /* isnan().  PowerPC32 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 power6
  25 EALIGN (__isnan, 4, 0)
  26         stwu    r1,-32(r1)
  27         cfi_adjust_cfa_offset (32)
  28         ori     r1,r1,0
  29         stfd    fp1,24(r1)      /* copy FPR to GPR */
  30         ori     r1,r1,0
  31         lwz     r4,24(r1)
  32         lwz     r5,28(r1)
  33         lis     r0,0x7ff0       /* const long r0 0x7ff00000 00000000 */
  34         clrlwi  r4,r4,1         /* x = fabs(x) */
  35         cmpw    cr7,r4,r0       /* if (fabs(x) =< inf) */
  36         cmpwi   cr6,r5,0
  37         li      r3,0            /* then return 0 */
  38         addi    r1,r1,32
  39         cfi_adjust_cfa_offset (-32)
  40         bltlr+  cr7
  41         bgt-    cr7,L(NaN)
  42         beqlr+  cr6
  43 L(NaN):
  44         li      r3,1            /* else return 1 */
  45         blr
  46         END (__isnan)
  47
  48 hidden_def (__isnan)
  49 weak_alias (__isnan, isnan)
  50
  51 #ifdef NO_LONG_DOUBLE
  52 strong_alias (__isnan, __isnanl)
  53 weak_alias (__isnan, isnanl)
  54 #endif
  55
  56 #ifndef IS_IN_libm
  57 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  58 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
  59 compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
  60 # endif
  61 #endif
  62