sysdeps/x86_64/fpu/s_copysign.S

   1 /* copy sign, double version.
   2    Copyright (C) 2002-2013 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Jaeger <aj@suse.de>, 2002.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <machine/asm.h>
  21
  22         .section .rodata.cst16,"aM",@progbits,16
  23
  24         .align ALIGNARG(4)
  25         .type signmask,@object
  26 signmask:
  27         .byte 0, 0, 0, 0, 0, 0, 0, 0x80
  28         .byte 0, 0, 0, 0, 0, 0, 0, 0
  29         ASM_SIZE_DIRECTIVE(signmask)
  30         .type othermask,@object
  31 othermask:
  32         .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
  33         .byte 0, 0, 0, 0, 0, 0, 0, 0
  34         ASM_SIZE_DIRECTIVE(othermask)
  35
  36 #ifdef PIC
  37 #define MO(op) op##(%rip)
  38 #else
  39 #define MO(op) op
  40 #endif
  41
  42         .text
  43 ENTRY(__copysign)
  44         andpd MO(othermask),%xmm0
  45         andpd MO(signmask),%xmm1
  46         orpd %xmm1,%xmm0
  47         ret
  48 END (__copysign)
  49
  50 weak_alias (__copysign, copysign)