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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
<?php
declare(strict_types=1);
namespace Nsfisis\Waddiwasi\WebAssembly\Execution;
use InvalidArgumentException;
use function assert;
use function bcadd;
use function bccomp;
use function bcmod;
use function bcpow;
use function bcsub;
use function fdiv;
use function is_nan;
use function pack;
use function unpack;
final readonly class NumericOps
{
private function __construct()
{
}
public static function reinterpretI32AsF32(int $x): float
{
return self::deserializeF32FromBytes(self::serializeI32ToBytes($x));
}
public static function reinterpretI64AsF32(int $x): float
{
return self::deserializeF32FromBytes(self::serializeI64ToBytes($x));
}
public static function reinterpretI32AsF64(int $x): float
{
return self::deserializeF64FromBytes(self::serializeI32ToBytes($x));
}
public static function reinterpretI64AsF64(int $x): float
{
return self::deserializeF64FromBytes(self::serializeI64ToBytes($x));
}
public static function reinterpretF32AsI32(float $x): int
{
return self::deserializeI32FromBytes(self::serializeF32ToBytes($x));
}
public static function reinterpretF64AsI32(float $x): int
{
return self::deserializeI32FromBytes(self::serializeF64ToBytes($x));
}
public static function reinterpretF32AsI64(float $x): int
{
return self::deserializeI64FromBytes(self::serializeF32ToBytes($x));
}
public static function reinterpretF64AsI64(float $x): int
{
return self::deserializeI64FromBytes(self::serializeF64ToBytes($x));
}
public static function truncateF64ToF32(float $x): float
{
return self::deserializeF32FromBytes(self::serializeF32ToBytes($x));
}
public static function serializeI32ToBytes(int $x): string
{
return pack('l', $x);
}
public static function deserializeI32FromBytes(string $s): int
{
$result = unpack('l', $s);
if ($result === false) {
throw new InvalidArgumentException("Failed to unpack i32: $s");
}
return $result[1];
}
public static function serializeI64ToBytes(int $x): string
{
return pack('q', $x);
}
public static function deserializeI64FromBytes(string $s): int
{
$result = unpack('q', $s);
if ($result === false) {
throw new InvalidArgumentException("Failed to unpack i64: $s");
}
return $result[1];
}
public static function serializeF32ToBytes(float $x): string
{
return pack('f', $x);
}
public static function deserializeF32FromBytes(string $s): float
{
$result = unpack('f', $s);
if ($result === false) {
throw new InvalidArgumentException("Failed to unpack f32: $s");
}
return $result[1];
}
public static function serializeF64ToBytes(float $x): string
{
return pack('d', $x);
}
public static function deserializeF64FromBytes(string $s): float
{
$result = unpack('d', $s);
if ($result === false) {
throw new InvalidArgumentException("Failed to unpack f64: $s");
}
return $result[1];
}
public static function convertS32ToU32(int $x): int
{
// assert(-0x80000000 <= $x && $x <= 0x7FFFFFFF, "convertS32ToU32: out of range $x");
if ($x < 0) {
$buf = pack('l', $x);
$result = unpack('L', $buf);
assert($result !== false);
assert(0x00000000 <= $result[1] && $result[1] <= 0xFFFFFFFF, "convertS32ToU32: out of range $result[1]");
return $result[1];
} else {
return $x;
}
}
public static function convertU32ToS32(int $x): int
{
assert(0x00000000 <= $x && $x <= 0xFFFFFFFF);
if (($x & 0x80000000) !== 0) {
$buf = pack('L', $x);
$result = unpack('l', $buf);
assert($result !== false);
assert(-0x80000000 <= $result[1] && $result[1] <= 0x7FFFFFFF, "convertU32ToS32: out of range $result[1]");
return $result[1];
} else {
return $x;
}
}
public static function convertS64ToBigUInt(int $x): string
{
if ($x < 0) {
return bcadd((string)$x, '18446744073709551616');
} else {
return (string)$x;
}
}
public static function bigIntToPhpInt(string $s): int
{
$result = bcmod($s, bcpow('2', '64'));
if ($result[0] === '-') {
// 2^63 <= -$result
if (bccomp(bcpow('2', '63'), bcsub('0', $result)) <= 0) {
$result = bcadd($result, bcpow('2', '64'));
}
} else {
// 2^63-1 < $result
if (bccomp(bcsub(bcpow('2', '63'), '1'), $result) < 0) {
$result = bcsub($result, bcpow('2', '64'));
}
}
return (int)$result;
}
public static function getFloatSign(float $p): int
{
if (is_nan($p)) {
$n = self::reinterpretF64AsI64($p);
// The MSB is the sign bit.
return (($n >> 63) & 1) === 1 ? -1 : 1;
} elseif ($p !== 0.0) {
return $p < 0.0 ? -1 : 1;
} else {
// Comparison with 0 does not work for -0.0.
return fdiv(1, $p) < 0.0 ? -1 : 1;
}
}
}
|
