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cfc91acd | 1 | /* Copy a sign bit between floating-point values. PowerPC64 version. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
cfc91acd RM |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
cfc91acd RM |
18 | |
19 | /* This has been coded in assembler because GCC makes such a mess of it | |
20 | when it's coded in C. */ | |
21 | ||
22 | #include <sysdep.h> | |
f964490f | 23 | #include <math_ldbl_opt.h> |
216933b2 | 24 | #include <libm-alias-float.h> |
d17542d2 | 25 | #include <libm-alias-double.h> |
cfc91acd | 26 | |
d5b41185 | 27 | ENTRY_TOCLESS (__copysign) |
d7d06f79 | 28 | CALL_MCOUNT 0 |
cfc91acd RM |
29 | /* double [f1] copysign (double [f1] x, double [f2] y); |
30 | copysign(x,y) returns a value with the magnitude of x and | |
31 | with the sign bit of y. */ | |
c859b32e | 32 | stfd fp2,-8(r1) |
a7e91561 UD |
33 | nop |
34 | nop | |
35 | nop | |
c859b32e | 36 | ld r3,-8(r1) |
cfc91acd | 37 | cmpdi r3,0 |
cfc91acd RM |
38 | blt L(0) |
39 | fabs fp1,fp1 | |
40 | blr | |
41 | L(0): fnabs fp1,fp1 | |
42 | blr | |
43 | END (__copysign) | |
44 | ||
d17542d2 | 45 | libm_alias_double (__copysign, copysign) |
cfc91acd RM |
46 | |
47 | /* It turns out that it's safe to use this code even for single-precision. */ | |
cfc91acd | 48 | strong_alias(__copysign,__copysignf) |
216933b2 | 49 | libm_alias_float (__copysign, copysign) |
cfc91acd | 50 | |
d17542d2 | 51 | #if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0) |
f964490f RM |
52 | compat_symbol (libc, __copysign, copysignl, GLIBC_2_0) |
53 | #endif |