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1da177e4 LT |
1 | /*---------------------------------------------------------------------------+ |
2 | | reg_convert.c | | |
3 | | | | |
4 | | Convert register representation. | | |
5 | | | | |
6 | | Copyright (C) 1992,1993,1994,1996,1997 | | |
7 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | | |
8 | | E-mail billm@suburbia.net | | |
9 | | | | |
10 | | | | |
11 | +---------------------------------------------------------------------------*/ | |
12 | ||
13 | #include "exception.h" | |
14 | #include "fpu_emu.h" | |
15 | ||
e8d591dc | 16 | int FPU_to_exp16(FPU_REG const *a, FPU_REG *x) |
1da177e4 | 17 | { |
3d0d14f9 IM |
18 | int sign = getsign(a); |
19 | ||
20 | *(long long *)&(x->sigl) = *(const long long *)&(a->sigl); | |
21 | ||
22 | /* Set up the exponent as a 16 bit quantity. */ | |
23 | setexponent16(x, exponent(a)); | |
24 | ||
25 | if (exponent16(x) == EXP_UNDER) { | |
26 | /* The number is a de-normal or pseudodenormal. */ | |
27 | /* We only deal with the significand and exponent. */ | |
28 | ||
29 | if (x->sigh & 0x80000000) { | |
30 | /* Is a pseudodenormal. */ | |
31 | /* This is non-80486 behaviour because the number | |
32 | loses its 'denormal' identity. */ | |
33 | addexponent(x, 1); | |
34 | } else { | |
35 | /* Is a denormal. */ | |
36 | addexponent(x, 1); | |
37 | FPU_normalize_nuo(x); | |
38 | } | |
1da177e4 | 39 | } |
1da177e4 | 40 | |
3d0d14f9 IM |
41 | if (!(x->sigh & 0x80000000)) { |
42 | EXCEPTION(EX_INTERNAL | 0x180); | |
43 | } | |
1da177e4 | 44 | |
3d0d14f9 | 45 | return sign; |
1da177e4 | 46 | } |