sysdeps/powerpc/powerpc64/power8/fpu/s_isinf.S

   1 /* isinf().  PowerPC64/POWER8 version.
   2    Copyright (C) 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 #define MFVSRD_R3_V1  .long 0x7c230066     /* mfvsrd  r3,vs1  */
  23
  24 /* int [r3] __isinf([fp1] x)  */
  25
  26 EALIGN (__isinf, 4, 0)
  27         CALL_MCOUNT 0
  28         MFVSRD_R3_V1
  29         lis     r9,0x7ff0     /* r9 = 0x7ff0  */
  30         rldicl  r10,r3,0,1    /* r10 = r3 & (0x8000000000000000)  */
  31         sldi    r9,r9,32      /* r9 = r9 << 52  */
  32         cmpd    cr7,r10,r9    /* fp1 & 0x7ff0000000000000 ?  */
  33         beq     cr7,L(inf)
  34         li      r3,0          /* Not inf  */
  35         blr
  36 L(inf):
  37         sradi   r3,r3,63      /* r3 = r3 >> 63  */
  38         ori     r3,r3,1       /* r3 = r3 | 0x1  */
  39         blr
  40 END (__isinf)
  41
  42 hidden_def (__isinf)
  43 weak_alias (__isinf, isinf)
  44
  45 /* It turns out that the 'double' version will also always work for
  46    single-precision.  */
  47 strong_alias (__isinf, __isinff)
  48 hidden_def (__isinff)
  49 weak_alias (__isinff, isinff)
  50
  51 #ifdef NO_LONG_DOUBLE
  52 strong_alias (__isinf, __isinfl)
  53 weak_alias (__isinf, isinfl)
  54 #endif
  55
  56 #if !IS_IN (libm)
  57 # if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  58 compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
  59 compat_symbol (libc, isinf, isinfl, GLIBC_2_0);
  60 # endif
  61 #endif