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Michael Munday b6245cef3c internal/bytealg: add SIMD byte count implementation for s390x 
Add a 'single lane' SIMD implemementation of the single byte count
function for use on machines that support the vector facility. This
allows up to 16 bytes to be counted per loop iteration.

We can probably improve performance further by adding more 'lanes'
(i.e. counting more bytes in parallel) however this will increase
the complexity of the function so I'm not sure it is worth doing
yet.

name                old speed      new speed       delta
pkg:strings goos:linux goarch:s390x
CountByte/10         789MB/s ± 0%   1131MB/s ± 0%    +43.44%  (p=0.000 n=9+9)
CountByte/32         936MB/s ± 0%   3236MB/s ± 0%   +245.87%  (p=0.000 n=8+9)
CountByte/4096      1.06GB/s ± 0%  21.26GB/s ± 0%  +1907.07%  (p=0.000 n=10+10)
CountByte/4194304   1.06GB/s ± 0%  20.54GB/s ± 0%  +1838.50%  (p=0.000 n=10+10)
CountByte/67108864  1.06GB/s ± 0%  18.31GB/s ± 0%  +1629.51%  (p=0.000 n=10+10)
pkg:bytes goos:linux goarch:s390x
CountSingle/10       800MB/s ± 0%    986MB/s ± 0%    +23.21%  (p=0.000 n=9+10)
CountSingle/32       925MB/s ± 0%   2744MB/s ± 0%   +196.55%  (p=0.000 n=9+10)
CountSingle/4K      1.26GB/s ± 0%  19.44GB/s ± 0%  +1445.59%  (p=0.000 n=10+10)
CountSingle/4M      1.26GB/s ± 0%  20.28GB/s ± 0%  +1510.26%  (p=0.000 n=8+10)
CountSingle/64M     1.23GB/s ± 0%  17.78GB/s ± 0%  +1350.67%  (p=0.000 n=9+10)

Change-Id: I230d57905db92a8fdfc50b1d5be338941ae3a7a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/199979
Run-TryBot: Michael Munday <mike.munday@ibm.com>
Reviewed-by: Keith Randall <khr@golang.org>
2019-11-04 22:06:16 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api/go1.13: add debug/elf.Symbol fields added in CL 184099 2019-08-08 18:44:16 +00:00
doc testing: implement Cleanup method 2019-11-04 10:13:30 +00:00
lib/time lib/time: update tz data to 2019b 2019-07-03 23:08:27 +00:00
misc misc/cgo/testcarchive: add missing exit(0) in main7.c 2019-11-04 05:27:25 +00:00
src internal/bytealg: add SIMD byte count implementation for s390x 2019-11-04 22:06:16 +00:00
test cmd/compile: add test for skipping empty init functions 2019-11-04 20:19:15 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: update email address for utkarsh-extc 2019-10-03 12:39:06 +00:00
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LICENSE
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README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
robots.txt
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

README.md

The Go Programming Language

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