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/* Copy a sign bit between floating-point values.
Copyright (C) 1997-2017 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>
#include <libm-alias-float.h>
#include <libm-alias-double.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+HIWORD(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)
libm_alias_double (__copysign, copysign)
/* It turns out that it's safe to use this code even for single-precision. */
strong_alias(__copysign,__copysignf)
libm_alias_float (__copysign, copysign)
#if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)
compat_symbol (libc, __copysign, copysignl, GLIBC_2_0)
#endif
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