1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/** @file
* SoftFloat - VBox Extension - extF80_tan.
*/
/*
* Copyright (C) 2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"
#include <iprt/types.h>
#include <iprt/x86.h>
extern const RTFLOAT128U g_r128pi2;
extFloat80_t extF80_tan( extFloat80_t x SOFTFLOAT_STATE_DECL_COMMA )
{
int32_t fSign = 0;
extFloat80_t v, f80Zero, f80One, f80Pi2;
f80Zero = ui32_to_extF80(0, pState);
f80One = ui32_to_extF80(1, pState);
f80Pi2 = f128_to_extF80(*(float128_t *)&g_r128pi2, pState);
if (extF80_le(x, f80Zero, pState))
{
x = extF80_sub(f80Zero, x, pState);
fSign = 1;
}
uint16_t fCxFlags = 0;
extFloat80_t rem = extF80_partialRem(x, f80Pi2, pState->roundingMode, &fCxFlags, pState);
int32_t const quo = X86_FSW_CX_TO_QUOTIENT(fCxFlags);
v = extF80_div(rem, f80Pi2, pState);
v = extF80_mul(v, v, pState);
v = extF80_sub(f80One, v, pState);
v = extF80_div(rem, v, pState);
if (quo % 2)
{
v = extF80_div(f80One, v, pState);
v = extF80_sub(f80Zero, v, pState);
}
if (fSign)
v = extF80_sub(f80Zero, v, pState);
return v;
}
|
