sysdeps/powerpc/powerpc32/fpu/s_copysign.S

   1 /* Copy a sign bit between floating-point values.
   2    Copyright (C) 1997-2014 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 /* This has been coded in assembler because GCC makes such a mess of it
  20    when it's coded in C.  */
  21
  22 #include <sysdep.h>
  23 #include <math_ldbl_opt.h>
  24
  25 ENTRY(__copysign)
  26 /* double [f1] copysign (double [f1] x, double [f2] y);
  27    copysign(x,y) returns a value with the magnitude of x and
  28    with the sign bit of y.  */
  29         stwu    r1,-16(r1)
  30         cfi_adjust_cfa_offset (16)
  31         stfd    fp2,8(r1)
  32         lwz     r3,8+HIWORD(r1)
  33         cmpwi   r3,0
  34         addi    r1,r1,16
  35         cfi_adjust_cfa_offset (-16)
  36         blt     L(0)
  37         fabs    fp1,fp1
  38         blr
  39 L(0):   fnabs   fp1,fp1
  40         blr
  41         END (__copysign)
  42
  43 weak_alias (__copysign,copysign)
  44
  45 /* It turns out that it's safe to use this code even for single-precision.  */
  46 weak_alias (__copysign,copysignf)
  47 strong_alias(__copysign,__copysignf)
  48
  49 #ifdef NO_LONG_DOUBLE
  50 weak_alias (__copysign,copysignl)
  51 strong_alias(__copysign,__copysignl)
  52 #endif
  53 #if IS_IN (libm)
  54 # if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
  55 compat_symbol (libm, __copysign, copysignl, GLIBC_2_0)
  56 # endif
  57 #elif LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
  58 compat_symbol (libc, __copysign, copysignl, GLIBC_2_0)
  59 #endif