mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
60 lines
1.8 KiB
ArmAsm
60 lines
1.8 KiB
ArmAsm
/* Copy a sign bit between floating-point values.
|
|
Copyright (C) 1997-2013 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* This has been coded in assembler because GCC makes such a mess of it
|
|
when it's coded in C. */
|
|
|
|
#include <sysdep.h>
|
|
#include <math_ldbl_opt.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)
|
|
cfi_adjust_cfa_offset (16)
|
|
stfd fp2,8(r1)
|
|
lwz r3,8(r1)
|
|
cmpwi r3,0
|
|
addi r1,r1,16
|
|
cfi_adjust_cfa_offset (-16)
|
|
blt L(0)
|
|
fabs fp1,fp1
|
|
blr
|
|
L(0): fnabs fp1,fp1
|
|
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
|
|
#ifdef IS_IN_libm
|
|
# if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
|
|
compat_symbol (libm, __copysign, copysignl, GLIBC_2_0)
|
|
# endif
|
|
#elif LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
|
|
compat_symbol (libc, __copysign, copysignl, GLIBC_2_0)
|
|
#endif
|