libgcc/config/rl78/signbit.S

   1 ;   Copyright (C) 2012-2018 Free Software Foundation, Inc.
   2 ;   Contributed by Red Hat.
   3 ;
   4 ; This file is free software; you can redistribute it and/or modify it
   5 ; under the terms of the GNU General Public License as published by the
   6 ; Free Software Foundation; either version 3, or (at your option) any
   7 ; later version.
   8 ;
   9 ; This file is distributed in the hope that it will be useful, but
  10 ; WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 ; General Public License for more details.
  13 ;
  14 ; Under Section 7 of GPL version 3, you are granted additional
  15 ; permissions described in the GCC Runtime Library Exception, version
  16 ; 3.1, as published by the Free Software Foundation.
  17 ;
  18 ; You should have received a copy of the GNU General Public License and
  19 ; a copy of the GCC Runtime Library Exception along with this program;
  20 ; see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 ; <http://www.gnu.org/licenses/>.
  22
  23 #include "vregs.h"
  24
  25 ;; int signbitf (float X)
  26 ;; int signbit  (double X)
  27 ;; int signbitl (long double X)
  28 ;;
  29 ;;     `signbit' returns a nonzero value if the value of X has its sign
  30 ;;     bit set.
  31 ;;
  32 ;;     This is not the same as `x < 0.0', because IEEE 754 floating point
  33 ;;     allows zero to be signed.  The comparison `-0.0 < 0.0' is false,
  34 ;;     but `signbit (-0.0)' will return a nonzero value.
  35
  36 ;----------------------------------------------------------------------
  37
  38         .text
  39
  40 START_FUNC              _signbit
  41 START_ANOTHER_FUNC      _signbitf
  42         ;; X is at [sp+4]..[SP+7]
  43         ;; result is in R8..R9
  44
  45         movw    r8, #0
  46         mov     a, [sp+7]
  47         mov1    cy, a.7
  48         sknc
  49         movw    r8, #1
  50         ret
  51 END_ANOTHER_FUNC        _signbitf
  52 END_FUNC                _signbit
  53
  54
  55 START_FUNC      _signbitl
  56         ;; X is at [sp+4]..[SP+7]
  57         ;; result is in R8..R9
  58
  59         movw    r8, #0
  60         mov     a, [sp+11]
  61         mov1    cy, a.7
  62         sknc
  63         movw    r8, #1
  64         ret
  65 END_FUNC        _signbitl