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4984d843d9
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Ilya Tocar 4984d843d9 compress/flate: optimize huffSym 
By using local variables and assigning them back to decompressor
at the end of huffSym, we allow compiler to keep them in registers
and avoid reloading/storing them repeatedly. To archive this,
moreBits was inlined and specialized to work with local variables.
Also move EOF error conversion to helper function, to make inlined
part of moreBits more readable. Together this results in nice speed-up:

name                             old time/op    new time/op    delta
Decode/Digits/Huffman/1e4-6         278µs ± 1%     240µs ± 2%  -13.72%  (p=0.000 n=10+10)
Decode/Digits/Huffman/1e5-6        2.38ms ± 1%    2.05ms ± 1%  -14.12%  (p=0.000 n=10+10)
Decode/Digits/Huffman/1e6-6        23.4ms ± 1%    19.9ms ± 0%  -14.69%  (p=0.000 n=9+9)
Decode/Digits/Speed/1e4-6           280µs ± 2%     254µs ± 1%   -9.28%  (p=0.000 n=10+9)
Decode/Digits/Speed/1e5-6          2.53ms ± 1%    2.35ms ± 1%   -7.17%  (p=0.000 n=10+10)
Decode/Digits/Speed/1e6-6          24.8ms ± 1%    23.0ms ± 1%   -7.22%  (p=0.000 n=10+10)
Decode/Digits/Default/1e4-6         281µs ± 2%     259µs ± 3%   -8.03%  (p=0.000 n=10+10)
Decode/Digits/Default/1e5-6        2.45ms ± 1%    2.30ms ± 1%   -6.15%  (p=0.000 n=10+10)
Decode/Digits/Default/1e6-6        24.1ms ± 1%    22.6ms ± 0%   -6.31%  (p=0.000 n=9+9)
Decode/Digits/Compression/1e4-6     279µs ± 2%     261µs ± 2%   -6.53%  (p=0.000 n=8+9)
Decode/Digits/Compression/1e5-6    2.44ms ± 1%    2.30ms ± 1%   -5.72%  (p=0.000 n=10+9)
Decode/Digits/Compression/1e6-6    24.0ms ± 1%    22.6ms ± 0%   -6.10%  (p=0.000 n=10+9)
Decode/Twain/Huffman/1e4-6          316µs ± 2%     267µs ± 3%  -15.30%  (p=0.000 n=9+10)
Decode/Twain/Huffman/1e5-6         2.62ms ± 0%    2.22ms ± 0%  -15.24%  (p=0.000 n=10+10)
Decode/Twain/Huffman/1e6-6         25.7ms ± 1%    21.8ms ± 0%  -15.19%  (p=0.000 n=10+10)
Decode/Twain/Speed/1e4-6            290µs ± 1%     264µs ± 2%   -9.17%  (p=0.000 n=9+10)
Decode/Twain/Speed/1e5-6           2.35ms ± 1%    2.13ms ± 1%   -9.74%  (p=0.000 n=9+10)
Decode/Twain/Speed/1e6-6           22.9ms ± 0%    20.7ms ± 0%   -9.68%  (p=0.000 n=10+9)
Decode/Twain/Default/1e4-6          270µs ± 2%     252µs ± 2%   -6.67%  (p=0.000 n=9+10)
Decode/Twain/Default/1e5-6         2.02ms ± 1%    1.84ms ± 1%   -8.85%  (p=0.000 n=10+10)
Decode/Twain/Default/1e6-6         19.1ms ± 0%    17.5ms ± 1%   -8.73%  (p=0.000 n=9+10)
Decode/Twain/Compression/1e4-6      272µs ± 1%     250µs ± 4%   -8.20%  (p=0.000 n=9+10)
Decode/Twain/Compression/1e5-6     2.01ms ± 0%    1.84ms ± 1%   -8.57%  (p=0.000 n=9+10)
Decode/Twain/Compression/1e6-6     19.1ms ± 0%    17.4ms ± 1%   -8.75%  (p=0.000 n=9+10)

name                             old speed      new speed      delta
Decode/Digits/Huffman/1e4-6      35.9MB/s ± 1%  41.7MB/s ± 2%  +15.91%  (p=0.000 n=10+10)
Decode/Digits/Huffman/1e5-6      41.9MB/s ± 1%  48.8MB/s ± 1%  +16.44%  (p=0.000 n=10+10)
Decode/Digits/Huffman/1e6-6      42.8MB/s ± 1%  50.2MB/s ± 0%  +17.22%  (p=0.000 n=9+9)
Decode/Digits/Speed/1e4-6        35.7MB/s ± 2%  39.4MB/s ± 1%  +10.22%  (p=0.000 n=10+9)
Decode/Digits/Speed/1e5-6        39.6MB/s ± 1%  42.6MB/s ± 1%   +7.73%  (p=0.000 n=10+10)
Decode/Digits/Speed/1e6-6        40.3MB/s ± 1%  43.4MB/s ± 1%   +7.78%  (p=0.000 n=10+10)
Decode/Digits/Default/1e4-6      35.6MB/s ± 2%  38.7MB/s ± 2%   +8.74%  (p=0.000 n=10+10)
Decode/Digits/Default/1e5-6      40.9MB/s ± 1%  43.6MB/s ± 1%   +6.55%  (p=0.000 n=10+10)
Decode/Digits/Default/1e6-6      41.5MB/s ± 1%  44.3MB/s ± 0%   +6.73%  (p=0.000 n=9+9)
Decode/Digits/Compression/1e4-6  35.8MB/s ± 2%  38.3MB/s ± 2%   +6.99%  (p=0.000 n=8+9)
Decode/Digits/Compression/1e5-6  40.9MB/s ± 1%  43.4MB/s ± 1%   +6.07%  (p=0.000 n=10+9)
Decode/Digits/Compression/1e6-6  41.6MB/s ± 1%  44.3MB/s ± 0%   +6.49%  (p=0.000 n=10+9)
Decode/Twain/Huffman/1e4-6       31.7MB/s ± 2%  37.4MB/s ± 3%  +18.08%  (p=0.000 n=9+10)
Decode/Twain/Huffman/1e5-6       38.2MB/s ± 0%  45.0MB/s ± 0%  +17.97%  (p=0.000 n=10+10)
Decode/Twain/Huffman/1e6-6       38.9MB/s ± 1%  45.9MB/s ± 0%  +17.90%  (p=0.000 n=10+10)
Decode/Twain/Speed/1e4-6         34.5MB/s ± 1%  38.0MB/s ± 2%  +10.11%  (p=0.000 n=9+10)
Decode/Twain/Speed/1e5-6         42.5MB/s ± 1%  47.0MB/s ± 1%  +10.79%  (p=0.000 n=9+10)
Decode/Twain/Speed/1e6-6         43.7MB/s ± 0%  48.3MB/s ± 0%  +10.72%  (p=0.000 n=10+9)
Decode/Twain/Default/1e4-6       37.1MB/s ± 2%  39.8MB/s ± 2%   +7.15%  (p=0.000 n=9+10)
Decode/Twain/Default/1e5-6       49.5MB/s ± 1%  54.3MB/s ± 1%   +9.71%  (p=0.000 n=10+10)
Decode/Twain/Default/1e6-6       52.3MB/s ± 0%  57.3MB/s ± 1%   +9.57%  (p=0.000 n=9+10)
Decode/Twain/Compression/1e4-6   36.7MB/s ± 1%  40.0MB/s ± 4%   +8.96%  (p=0.000 n=9+10)
Decode/Twain/Compression/1e5-6   49.8MB/s ± 0%  54.5MB/s ± 1%   +9.38%  (p=0.000 n=9+10)
Decode/Twain/Compression/1e6-6   52.3MB/s ± 0%  57.3MB/s ± 1%   +9.58%  (p=0.000 n=9+10)

Change-Id: Iabfd285535ddb210f7f48f33317c6463b5532400
Reviewed-on: https://go-review.googlesource.com/102235
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-04-17 22:37:49 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api api: remove unnecessary lines from except.txt 2018-04-09 21:19:11 +00:00
doc doc/contribute.html: adjust wording from previous CL 2018-04-16 22:12:29 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc misc/ios: speed up the iOS exec wrapper 2018-04-12 19:30:54 +00:00
src compress/flate: optimize huffSym 2018-04-17 22:37:49 +00:00
test cmd/compile: generate constants for NeqPtr, EqPtr and IsNonNil ops 2018-04-16 20:43:57 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: update number of contributors 2018-04-03 22:10:32 +00:00
robots.txt

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