Some secondary asm T3,T4,T5 functions

[David Miller]

From: David Miller <davem at davemloft.net>
Date: Tue, 02 Apr 2013 15:06:42 -0400 (EDT)

> With this corrected I tried dive_1.asm and several tests fail, I'll
> try to figure out why.

This turned out to be easy, you were using %o5 as a register for
'dinv' but this gets clobbered elsewhere in the code, using %o4
instead fixes the problems.

Attached is a dive_1.asm that works for me on real hardware as
well as T4 timings from:

tune/speed -p10000000 -s1-1000 -f1.1 -C mpn_divexact_1.3
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overhead 6.00 cycles, precision 10000000 units of 3.51e-10 secs, CPU freq 2847.41 MHz
        mpn_divexact_1.3
1             43.0004
2             26.9174
3             22.7782
4             20.5837
5             19.4004
6             20.1670
7             20.0004
8             20.2504
9             19.8338
10            19.7004
11            19.8186
12            20.0008
13            20.3851
14            20.7862
15            21.1338
16            21.4380
17            21.7067
18            21.9450
19            22.1584
20            22.3505
22            22.6828
24            22.9593
26            23.1933
28            23.3939
30            30.7669
33            29.5761
36            29.2781
39            29.0260
42            28.8098
46            28.5655
50            28.3603
55            28.1458
60            27.9670
66            27.7882
72            27.6392
79            27.4940
86            27.3724
94            27.2556
103           27.1459
113           27.0446
124           26.9519
136           26.8680
149           26.7922
163           26.7242
179           26.6595
196           26.6023
215           26.5491
236           26.5003
259           26.4559
284           26.4158
312           26.3785
343           26.3443
377           26.3133
414           26.2853
455           26.2596
500           26.2363
550           26.2148
605           26.1953
665           26.1778
731           26.1617
804           26.1471
884           26.1338
972           26.1218