1 TODO LIST
2 =========
3
4 ::
5
6 POW{cond}<S|D|E>{P,M,Z} Fd, Fn, <Fm,#value>
7 RPW{cond}<S|D|E>{P,M,Z} Fd, Fn, <Fm,#value>
8 POL{cond}<S|D|E>{P,M,Z} Fd, Fn, <Fm,#value>
9
10 LOG{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - lo
11 LGN{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - lo
12 EXP{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - ex
13 SIN{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - si
14 COS{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - co
15 TAN{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - ta
16 ASN{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - ar
17 ACS{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - ar
18 ATN{cond}<S|D|E>{P,M,Z} Fd, <Fm,#value> - ar
19
20 These are not implemented. They are not curre
21 and are handled by routines in libc. These ar
22 hardware, but are handled by the floating poin
23 be implemented in future versions.
24
25 There are a couple of ways to approach the imp
26 method would be to use accurate table methods
27 a couple of papers by S. Gal from IBM's resear
28 seem to promise extreme accuracy (in the order
29 These methods are used in GLIBC for some of th
30
31 Another approach, which I know little about is
32 Coordinate Rotation Digital Computer, and is a
33 transcendental functions using mostly shifts a
34 multiplications and divisions. The ARM excels
35 so such a method could be promising, but requi
36 determine if it is feasible.
37
38 Rounding Methods
39 ----------------
40
41 The IEEE standard defines 4 rounding modes. R
42 default, but rounding to + or - infinity or ro
43 Many architectures allow the rounding mode to
44 in a control register. Not so with the ARM FP
45 the rounding mode one must specify it with eac
46
47 This has made porting some benchmarks difficul
48 introduce such a capability into the emulator.
49 bits describing the rounding mode. The emulat
50 examine a flag, which if set forced it to igno
51 the instruction, and use the mode specified in
52
53 This would require a method of getting/setting
54 in the FPCR. This requires a kernel call in A
55 supervisor only instructions. If anyone has a
56 would like to hear them.
57
58 NOTE:
59 pulled out from some docs on ARM floating poi
60 for the Acorn FPE, but not limited to it:
61
62 The floating point control register (FPCR) ma
63 implementations: it is there to control the h
64 specific manner, for example to disable the f
65 mode of the ARM is not permitted to use this
66 reserved to alter it between implementations)
67 instructions will trap if tried in user mode.
68
69 Hence, the answer is yes, you could do this,
70 risk of becoming isolated if and when hardwar
71
72 -- Russell.
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