1/* Copy a sign bit between floating-point values.
2   Copyright (C) 1997, 1999, 2000 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, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20/* This has been coded in assembler because GCC makes such a mess of it
21   when it's coded in C.  */
22
23#include <sysdep.h>
24
25ENTRY(__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	stfd	fp2,8(r1)
31	lwz	r3,8(r1)
32	cmpwi   r3,0
33	addi    r1,r1,16
34	blt     L(0)
35	fabs    fp1,fp1
36	blr
37L(0):	fnabs   fp1,fp1
38	blr
39	END (__copysign)
40
41weak_alias(__copysign,copysign)
42
43/* It turns out that it's safe to use this code even for single-precision.  */
44weak_alias(__copysign,copysignf)
45strong_alias(__copysign,__copysignf)
46
47#ifdef NO_LONG_DOUBLE
48weak_alias(__copysign,copysignl)
49strong_alias(__copysign,__copysignl)
50#endif
51