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
|
/*---------------------------------------------------------------------------+
| reg_constant.c |
| |
| All of the constant FPU_REGs |
| |
| Copyright (C) 1992,1993,1994 |
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
| Australia. E-mail billm@vaxc.cc.monash.edu.au |
| |
| |
+---------------------------------------------------------------------------*/
#include "fpu_system.h"
#include "fpu_emu.h"
#include "status_w.h"
#include "reg_constant.h"
FPU_REG const CONST_1 = { SIGN_POS, TW_Valid, EXP_BIAS,
0x00000000, 0x80000000 };
FPU_REG const CONST_2 = { SIGN_POS, TW_Valid, EXP_BIAS+1,
0x00000000, 0x80000000 };
FPU_REG const CONST_HALF = { SIGN_POS, TW_Valid, EXP_BIAS-1,
0x00000000, 0x80000000 };
FPU_REG const CONST_L2T = { SIGN_POS, TW_Valid, EXP_BIAS+1,
0xcd1b8afe, 0xd49a784b };
FPU_REG const CONST_L2E = { SIGN_POS, TW_Valid, EXP_BIAS,
0x5c17f0bc, 0xb8aa3b29 };
FPU_REG const CONST_PI = { SIGN_POS, TW_Valid, EXP_BIAS+1,
0x2168c235, 0xc90fdaa2 };
FPU_REG const CONST_PI2 = { SIGN_POS, TW_Valid, EXP_BIAS,
0x2168c235, 0xc90fdaa2 };
FPU_REG const CONST_PI4 = { SIGN_POS, TW_Valid, EXP_BIAS-1,
0x2168c235, 0xc90fdaa2 };
FPU_REG const CONST_LG2 = { SIGN_POS, TW_Valid, EXP_BIAS-2,
0xfbcff799, 0x9a209a84 };
FPU_REG const CONST_LN2 = { SIGN_POS, TW_Valid, EXP_BIAS-1,
0xd1cf79ac, 0xb17217f7 };
/* Extra bits to take pi/2 to more than 128 bits precision. */
FPU_REG const CONST_PI2extra = { SIGN_NEG, TW_Valid, EXP_BIAS-66,
0xfc8f8cbb, 0xece675d1 };
/* Only the sign (and tag) is used in internal zeroes */
FPU_REG const CONST_Z = { SIGN_POS, TW_Zero, EXP_UNDER, 0x0, 0x0 };
/* Only the sign and significand (and tag) are used in internal NaNs */
/* The 80486 never generates one of these
FPU_REG const CONST_SNAN = { SIGN_POS, TW_NaN, EXP_OVER, 0x00000001, 0x80000000 };
*/
/* This is the real indefinite QNaN */
FPU_REG const CONST_QNaN = { SIGN_NEG, TW_NaN, EXP_OVER, 0x00000000, 0xC0000000 };
/* Only the sign (and tag) is used in internal infinities */
FPU_REG const CONST_INF = { SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x80000000 };
static void fld_const(FPU_REG const *c)
{
FPU_REG *st_new_ptr;
if ( STACK_OVERFLOW )
{
stack_overflow();
return;
}
push();
reg_move(c, st_new_ptr);
clear_C1();
}
static void fld1(void)
{
fld_const(&CONST_1);
}
static void fldl2t(void)
{
fld_const(&CONST_L2T);
}
static void fldl2e(void)
{
fld_const(&CONST_L2E);
}
static void fldpi(void)
{
fld_const(&CONST_PI);
}
static void fldlg2(void)
{
fld_const(&CONST_LG2);
}
static void fldln2(void)
{
fld_const(&CONST_LN2);
}
static void fldz(void)
{
fld_const(&CONST_Z);
}
static FUNC constants_table[] = {
fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, FPU_illegal
};
void fconst(void)
{
(constants_table[FPU_rm])();
}
|
