Re: [hatari-devel] Beams TT demo FPU warnings

[Toni Wilen <twilen@xxxxxxxxxx>]

> It would be good to have a test program reporting all the possible
> FPU constant values. People owning TT machines could then run it
> and report the values they get from their 68882 FPUs, so that we
> can see whether the mask sets actually differed in reality.  Or
> just add one of those sets to Hatari.

I dumped 68882 contents and most undocumented fields are zeros. 68881
output is also needed (I only have 68882s). This does not match
documentation ("constants useful only to the on-chip microcode
routines"), so perhaps 68881 has more non-zero values?

This is what 68882 returns (Using dump program that someone made ages
ago, I don't remember what < or > mean)

0   $00 < 0x40000000C90FDAA22168C235 (3.14159)
1   $01   0x40010000FE00068200000000 (7.9375)
2   $02   0x40010000FFC0050380000000 (7.99219)
3   $03   0x200000007FFFFFFF00000000 (NaN0.000000)
4   $04   0x00000000FFFFFFFFFFFFFFFF (0)
5   $05   0x3C000000FFFFFFFFFFFFF800 (2.22507e-308)
6   $06   0x3F800000FFFFFF0000000000 (1.17549e-38)
7   $07   0x00010000F65D8D9C00000000 (NaN0.000000)
8   $08   0x7FFF0000401E000000000000 (NaN0.000000)
9   $09   0x43F30000E000000000000000 (7.68057e+304)
10  $0A   0x40720000C000000000000000 (6.23076e+34)
11  $0B > 0x3FFD00009A209A84FBCFF798 (0.30103)
12  $0C > 0x40000000ADF85458A2BB4A9A (2.71828)
13  $0D < 0x3FFF0000B8AA3B295C17F0BC (1.4427)
14  $0E   0x3FFD0000DE5BD8A937287195 (0.434294)
15  $0F   0x000000000000000000000000 (0)
16  $10   0x000000000000000000000000 (0)
17  $11   0x000000000000000000000000 (0)
18  $12   0x000000000000000000000000 (0)
19  $13   0x000000000000000000000000 (0)
20  $14   0x000000000000000000000000 (0)
21  $15   0x000000000000000000000000 (0)
22  $16   0x000000000000000000000000 (0)
23  $17   0x000000000000000000000000 (0)
24  $18   0x000000000000000000000000 (0)
25  $19   0x000000000000000000000000 (0)
26  $1A   0x000000000000000000000000 (0)
27  $1B   0x000000000000000000000000 (0)
28  $1C   0x000000000000000000000000 (0)
29  $1D   0x000000000000000000000000 (0)
30  $1E   0x000000000000000000000000 (0)
31  $1F   0x000000000000000000000000 (0)
32  $20   0x000000000000000000000000 (0)
33  $21   0x000000000000000000000000 (0)
34  $22   0x000000000000000000000000 (0)
35  $23   0x000000000000000000000000 (0)
36  $24   0x000000000000000000000000 (0)
37  $25   0x000000000000000000000000 (0)
38  $26   0x000000000000000000000000 (0)
39  $27   0x000000000000000000000000 (0)
40  $28   0x000000000000000000000000 (0)
41  $29   0x000000000000000000000000 (0)
42  $2A   0x000000000000000000000000 (0)
43  $2B   0x000000000000000000000000 (0)
44  $2C   0x000000000000000000000000 (0)
45  $2D   0x000000000000000000000000 (0)
46  $2E   0x000000000000000000000000 (0)
47  $2F   0x000000000000000000000000 (0)
48  $30 < 0x3FFE0000B17217F7D1CF79AC (0.693147)
49  $31 < 0x40000000935D8DDDAAA8AC17 (2.30259)
50  $32   0x3FFF00008000000000000000 (1)
51  $33   0x40020000A000000000000000 (10)
52  $34   0x40050000C800000000000000 (100)
53  $35   0x400C00009C40000000000000 (10000)
54  $36   0x40190000BEBC200000000000 (1e+08)
55  $37   0x403400008E1BC9BF04000000 (1e+16)
56  $38 < 0x406900009DC5ADA82B70B59E (1e+32)
57  $39 > 0x40D30000C2781F49FFCFA6D5 (1e+64)
58  $3A < 0x41A8000093BA47C980E98CE0 (1e+128)
59  $3B < 0x43510000AA7EEBFB9DF9DE8E (1e+256)
60  $3C < 0x46A30000E319A0AEA60E91C7 (Inf)
61  $3D > 0x4D480000C976758681750C17 (Inf)
62  $3E < 0x5A9200009E8B3B5DC53D5DE5 (Inf)
63  $3F < 0x75250000C46052028A20979B (Inf)

(64 - 127 is same as 0 to 63 so mask should be 0x3f, not 0x7f. Unless
68881 works differently)