sysdeps/i386/fpu/s_trunc.S

   1 /* Truncate double value.
   2    Copyright (C) 1997-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   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 ENTRY(__trunc)
  23         fldl    4(%esp)
  24         subl    $8, %esp
  25         cfi_adjust_cfa_offset (8)
  26         fstcw   4(%esp)
  27         movl    $0xc00, %edx
  28         orl     4(%esp), %edx
  29         movl    %edx, (%esp)
  30         fldcw   (%esp)
  31         frndint
  32         fldcw   4(%esp)
  33         addl    $8, %esp
  34         cfi_adjust_cfa_offset (-8)
  35         ret
  36 END(__trunc)
  37 weak_alias (__trunc, trunc)