51 lines
1.6 KiB
ArmAsm
51 lines
1.6 KiB
ArmAsm
/* 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
|