diff options
Diffstat (limited to 'sysdeps/libm-i387/s_fmax.S')
| -rw-r--r-- | sysdeps/libm-i387/s_fmax.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/libm-i387/s_fmax.S b/sysdeps/libm-i387/s_fmax.S new file mode 100644 index 0000000000..3dbaa139ad --- /dev/null +++ b/sysdeps/libm-i387/s_fmax.S @@ -0,0 +1,44 @@ +/* Compute maximum of two numbers, regarding NaN as missing argument. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> + + .text +ENTRY(__fmax) + fldl 12(%esp) // y + fxam + fnstsw + fldl 4(%esp) // y : x + + andb $0x45, %ah + cmpb $0x01, %ah + je 1f // y == NaN + + fucom %st(1) + fnstsw + sahf + jnc 1f + + fxch %st(1) +1: fstp %st(1) + + ret +END(__fmax) +weak_alias (__fmax, fmax) |