1/* copy sign, double version.
2 Copyright (C) 2002-2022 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, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <machine/asm.h>
20#include <libm-alias-double.h>
21
22 .section .rodata.cst16,"aM",@progbits,16
23
24 .align ALIGNARG(4)
25 .type signmask,@object
26signmask:
27 .byte 0, 0, 0, 0, 0, 0, 0, 0x80
28 .byte 0, 0, 0, 0, 0, 0, 0, 0
29 ASM_SIZE_DIRECTIVE(signmask)
30 .type othermask,@object
31othermask:
32 .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
33 .byte 0, 0, 0, 0, 0, 0, 0, 0
34 ASM_SIZE_DIRECTIVE(othermask)
35
36#ifdef PIC
37#define MO(op) op##(%rip)
38#else
39#define MO(op) op
40#endif
41
42 .text
43ENTRY(__copysign)
44 andpd MO(othermask),%xmm0
45 andpd MO(signmask),%xmm1
46 orpd %xmm1,%xmm0
47 ret
48END (__copysign)
49
50libm_alias_double (__copysign, copysign)
51

source code of glibc/sysdeps/x86_64/fpu/s_copysign.S