Neon mul_basecase

[Torbjorn Granlund]

Richard Henderson <rth at twiddle.net> writes:

  I'm not 100% sure how to interpret the speed results, since they're
  not really in the same units as before.  But comparing to mpn_mul_2
  they're not encouraging.  Am I doing something wrong with the testing
  or did the 1.64 cyc/limb I got for addmul_8 not really come over to
  this test?
  
  But at least it pases make check...
  
On systems where we cannot reach a cycle counter, and where the clock
drops for an idle system, speed is not reliable.

Passing -p10000000 might help.

parma$ tune/speed -p10000000 -C -s 1-40
mpn_mul_basecase mpn_sqr_basecaseclock_gettime is 1.000ns accurate
overhead 51.51 cycles, precision 10000000 units of 1.00e-09 secs, CPU freq 1694.10 MHz
        mpn_mul_basecase mpn_sqr_basecase
1            249.1149      #10.9920
2             17.9868       #8.4933
3             18.6519       #8.4938
4             18.4860      #11.2413
5             21.5837      #12.9901
6             21.4839      #15.1557
7             24.4103      #15.9892
8             25.4805      #17.4870
9             29.2007      #17.7648
10            34.2352      #19.0867
11            35.1140      #19.6235
12            36.5579      #20.6528
13            39.5108      #21.4463
14            40.8981      #25.1966
15            43.8365      #26.2477
16            45.5297      #26.6692
17            48.7875      #27.6847
18            50.1309      #27.7579
19            53.3292      #28.9786
20            54.9094      #29.0294
21            58.3364      #30.7874
22            59.6392      #30.8415
23            62.9972      #33.1067
24            64.4941      #32.7251
25            68.0297      #34.8538
26            69.2953      #34.4750
27            72.7605      #37.2694
28            74.1959      #36.3672
29            77.8029      #39.0739
30            79.0416      #38.3379
31            82.5836      #41.6473
32            83.9695      #41.1573
33            87.6311      #43.5729
34            88.8488      #42.8273
35            92.4461      #46.3504
36            93.7906      #46.0767
37            97.4999      #48.3971
38            98.6904      #47.9918
39           102.3349      #51.2183
40           103.6475      #50.2492

-- 
Torbjörn