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/* Copy a sign bit between floating-point values.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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. */
/* This has been coded in assembler because GCC makes such a mess of it
when it's coded in C. */
#include <sysdep.h>
ENTRY(__copysign)
/* double [f1] copysign (double [f1] x, double [f2] y);
copysign(x,y) returns a value with the magnitude of x and
with the sign bit of y. */
stwu %r1,-16(%r1)
stfd %f2,8(%r1)
lwz %r3,8(%r1)
cmpwi %r3,0
addi %r1,%r1,16
blt 0f
fabs %f1,%f1
blr
0: fnabs %f1,%f1
blr
END (__copysign)
weak_alias(__copysign,copysign)
/* It turns out that it's safe to use this code even for single-precision. */
weak_alias(__copysign,copysignf)
strong_alias(__copysign,__copysignf)
#ifdef NO_LONG_DOUBLE
weak_alias(__copysign,copysignl)
strong_alias(__copysign,__copysignl)
#endif
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