1 // SPDX-License-Identifier: GPL-2.0 1
2 /*--------------------------------------------
3 | reg_convert.c
4 |
5 | Convert register representation.
6 |
7 | Copyright (C) 1992,1993,1994,1996,1997
8 | W. Metzenthen, 22 Parker S
9 | E-mail billm@suburbia.ne
10 |
11 |
12 +--------------------------------------------
13
14 #include "exception.h"
15 #include "fpu_emu.h"
16
17 int FPU_to_exp16(FPU_REG const *a, FPU_REG *x)
18 {
19 int sign = getsign(a);
20
21 *(long long *)&(x->sigl) = *(const lon
22
23 /* Set up the exponent as a 16 bit qua
24 setexponent16(x, exponent(a));
25
26 if (exponent16(x) == EXP_UNDER) {
27 /* The number is a de-normal o
28 /* We only deal with the signi
29
30 if (x->sigh & 0x80000000) {
31 /* Is a pseudodenormal
32 /* This is non-80486 b
33 loses its 'denormal
34 addexponent(x, 1);
35 } else {
36 /* Is a denormal. */
37 addexponent(x, 1);
38 FPU_normalize_nuo(x);
39 }
40 }
41
42 if (!(x->sigh & 0x80000000)) {
43 EXCEPTION(EX_INTERNAL | 0x180)
44 }
45
46 return sign;
47 }
48
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