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26d74e8b65
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Vlad Krasnov 26d74e8b65 math/big: reduce amount of copying in Montgomery multiplication 
Instead shifting the accumulator every iteration of the loop, shift
once in the end. This significantly improves performance on arm64.

On arm64:

name                  old time/op    new time/op    delta
RSA2048Decrypt          3.33ms ± 0%    2.63ms ± 0%  -20.94%  (p=0.000 n=11+11)
RSA2048Sign             4.22ms ± 0%    3.55ms ± 0%  -15.89%  (p=0.000 n=11+11)
3PrimeRSA2048Decrypt    1.95ms ± 0%    1.59ms ± 0%  -18.59%  (p=0.000 n=11+11)

On Skylake:

name                    old time/op  new time/op  delta
RSA2048Decrypt-8        1.73ms ± 2%  1.55ms ± 2%  -10.19%  (p=0.000 n=10+10)
RSA2048Sign-8           2.17ms ± 2%  2.00ms ± 2%   -7.93%  (p=0.000 n=10+10)
3PrimeRSA2048Decrypt-8  1.10ms ± 2%  0.96ms ± 2%  -13.03%  (p=0.000 n=10+9)

Change-Id: I5786191a1a09e4217fdb1acfd90880d35c5855f7
Reviewed-on: https://go-review.googlesource.com/99838
Run-TryBot: Vlad Krasnov <vlad@cloudflare.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2018-03-19 21:40:56 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: support Getwd on all BSDs 2018-02-13 15:41:19 +00:00
doc doc: remove non-prime from list of primes in spec 2018-03-19 18:26:12 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc runtime: identify special functions by flag instead of address 2018-03-15 17:31:57 +00:00
src math/big: reduce amount of copying in Montgomery multiplication 2018-03-19 21:40:56 +00:00
test test/codegen: port maps test to codegen 2018-03-19 13:39:34 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update my name and spelling 2018-02-21 04:12:57 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Filippo Valsorda's @golang.org email 2018-03-12 22:29:04 +00:00
favicon.ico
LICENSE
PATENTS
README.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
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