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

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