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The Go programming language
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Lynn Boger 216714e44f math/big: improve performance of mulAddVWW on ppc64x 
This changes the assembly implementation on ppc64x
to improve performance by reordering some instructions.
It also eliminates an unnecessary move by changing an
ADDZE to use the correct target register.

Improvement on power9:

MulAddVWW/1         6.89ns ± 0%    7.30ns ± 0%   +5.95%  (p=1.000 n=1+1)
MulAddVWW/2         8.04ns ± 0%    8.06ns ± 0%   +0.25%  (p=1.000 n=1+1)
MulAddVWW/3         9.39ns ± 0%    9.39ns ± 0%     ~     (all equal)
MulAddVWW/4         9.76ns ± 0%    9.48ns ± 0%   -2.87%  (p=1.000 n=1+1)
MulAddVWW/5         10.5ns ± 0%    10.3ns ± 0%   -1.90%  (p=1.000 n=1+1)
MulAddVWW/10        15.4ns ± 0%    14.9ns ± 0%   -3.25%  (p=1.000 n=1+1)
MulAddVWW/100        149ns ± 0%     125ns ± 0%  -16.11%  (p=1.000 n=1+1)
MulAddVWW/1000      1.42µs ± 0%    1.28µs ± 0%   -9.74%  (p=1.000 n=1+1)
MulAddVWW/10000     14.2µs ± 0%    12.8µs ± 0%   -9.73%  (p=1.000 n=1+1)
MulAddVWW/100000     144µs ± 0%     129µs ± 0%  -10.10%  (p=1.000 n=1+1)

Change-Id: I0ae7002a69783ca19d7a4e3e42042ae75dc60069
Reviewed-on: https://go-review.googlesource.com/c/go/+/248721
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
2020-08-18 20:25:26 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api go/printer: remove exported StdFormat flag 2020-07-17 02:15:01 +00:00
doc all: replace Replace(..., -1) with ReplaceAll(...) 2020-08-17 04:07:23 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020a 2020-04-30 08:07:39 +00:00
misc cmd/cgo: fix mangling of enum and union types 2020-07-31 16:35:33 +00:00
src math/big: improve performance of mulAddVWW on ppc64x 2020-08-18 20:25:26 +00:00
test cmd/compile: clean up and optimize s390x multiplication rules 2020-08-18 15:39:44 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add Kush Patel (corporate CLA for Hootsuite Inc) 2020-07-08 00:10:44 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: update for the Go 1.15 release 2020-08-10 21:51:48 +00:00
favicon.ico
LICENSE
PATENTS
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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