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178a609fed
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Emmanuel T Odeke 178a609fed runtime: convert initial timediv quotient increments to bitsets 
At the very beginning of timediv, inside a for loop,
we reduce the base value by at most (1<<31)-1, while
incrementing the quotient result by 1<<uint(bit).
However, since the quotient value was 0 to begin with,
we are essentially just doing bitsets.

This change is in the hot path of various concurrency and
scheduling operations that require sleeping, waiting
on mutexes and futexes etc. On the following OSes:
* Dragonfly
* FreeBSD
* Linux
* NetBSD
* OpenBSD
* Plan9
* Windows

and paired with architectures that provide the BTS instruction, this
change shaves off a couple of nanoseconds per invocation of timediv.

Fixes #27529

Change-Id: Ia2fea5022c1109e02d86d1f962a3b0bd70967aa6
Reviewed-on: https://go-review.googlesource.com/134231
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2018-09-12 17:24:59 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: implement Unix Socket for Windows 2018-08-28 09:26:45 +00:00
doc doc: make golang-nuts discussion list more prominent 2018-09-08 19:47:06 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc misc/cgo/testplugin: disable DWARF tests on darwin 2018-09-05 11:27:37 +00:00
src runtime: convert initial timediv quotient increments to bitsets 2018-09-12 17:24:59 +00:00
test test: fix the wrong test of math.Copysign(c, -1) for arm64 2018-09-12 15:34:20 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
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The Go Programming Language

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