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Lynn Boger bdab5df40f cmd/compile,cmd/internal/obj/ppc64: use mulli where possible 
This adds support to allow the use of mulli when one of the multiply
operands is a constant that fits in 16 bits.

This especially helps in the case where this instruction appears in
a loop since the load of the constant is not being moved out of the loop.

Some improvements seen in compress/flate on power9:

Decode/Digits/Huffman/1e4         259µs ± 0%     261µs ± 0%   +0.57%  (p=1.000 n=1+1)
Decode/Digits/Huffman/1e5        2.43ms ± 0%    2.45ms ± 0%   +0.79%  (p=1.000 n=1+1)
Decode/Digits/Huffman/1e6        23.9ms ± 0%    24.2ms ± 0%   +0.86%  (p=1.000 n=1+1)
Decode/Digits/Speed/1e4           278µs ± 0%     279µs ± 0%   +0.34%  (p=1.000 n=1+1)
Decode/Digits/Speed/1e5          2.80ms ± 0%    2.81ms ± 0%   +0.29%  (p=1.000 n=1+1)
Decode/Digits/Speed/1e6          28.0ms ± 0%    28.1ms ± 0%   +0.28%  (p=1.000 n=1+1)
Decode/Digits/Default/1e4         278µs ± 0%     278µs ± 0%   +0.28%  (p=1.000 n=1+1)
Decode/Digits/Default/1e5        2.68ms ± 0%    2.69ms ± 0%   +0.19%  (p=1.000 n=1+1)
Decode/Digits/Default/1e6        26.6ms ± 0%    26.6ms ± 0%   +0.21%  (p=1.000 n=1+1)
Decode/Digits/Compression/1e4     278µs ± 0%     278µs ± 0%   +0.00%  (p=1.000 n=1+1)
Decode/Digits/Compression/1e5    2.68ms ± 0%    2.69ms ± 0%   +0.21%  (p=1.000 n=1+1)
Decode/Digits/Compression/1e6    26.6ms ± 0%    26.6ms ± 0%   +0.07%  (p=1.000 n=1+1)
Decode/Newton/Huffman/1e4         322µs ± 0%     312µs ± 0%   -2.84%  (p=1.000 n=1+1)
Decode/Newton/Huffman/1e5        3.11ms ± 0%    2.91ms ± 0%   -6.41%  (p=1.000 n=1+1)
Decode/Newton/Huffman/1e6        31.4ms ± 0%    29.3ms ± 0%   -6.85%  (p=1.000 n=1+1)
Decode/Newton/Speed/1e4           282µs ± 0%     269µs ± 0%   -4.69%  (p=1.000 n=1+1)
Decode/Newton/Speed/1e5          2.29ms ± 0%    2.20ms ± 0%   -4.13%  (p=1.000 n=1+1)
Decode/Newton/Speed/1e6          22.7ms ± 0%    21.3ms ± 0%   -6.06%  (p=1.000 n=1+1)
Decode/Newton/Default/1e4         254µs ± 0%     237µs ± 0%   -6.60%  (p=1.000 n=1+1)
Decode/Newton/Default/1e5        1.86ms ± 0%    1.75ms ± 0%   -5.99%  (p=1.000 n=1+1)
Decode/Newton/Default/1e6        18.1ms ± 0%    17.4ms ± 0%   -4.10%  (p=1.000 n=1+1)
Decode/Newton/Compression/1e4     254µs ± 0%     244µs ± 0%   -3.91%  (p=1.000 n=1+1)
Decode/Newton/Compression/1e5    1.85ms ± 0%    1.79ms ± 0%   -3.10%  (p=1.000 n=1+1)
Decode/Newton/Compression/1e6    18.0ms ± 0%    17.3ms ± 0%   -3.88%  (p=1.000 n=1+1)

Change-Id: I840320fab1c4bf64c76b001c2651ab79f23df4eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/259444
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Carlos Eduardo Seo <carlos.seo@gmail.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
 		2020-10-06 19:40:46 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api text/template: add CommentNode to template parse tree 2020-08-28 21:45:12 +00:00
doc cmd/go/internal/get: improve -insecure deprecation docs 2020-10-06 19:39:32 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020a 2020-04-30 08:07:39 +00:00
misc cmd/compile: export notinheap annotation to object file 2020-10-05 18:52:43 +00:00
src cmd/compile,cmd/internal/obj/ppc64: use mulli where possible 2020-10-06 19:40:46 +00:00
test cmd/compile: correct leaf type when "selecting" singleton register-sized struct 2020-10-06 15:37:42 +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
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
…
README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
robots.txt
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.