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go/misc/cgo
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Ilya Tocar 91102bf723 runtime: use bytes.IndexByte in findnull 
bytes.IndexByte is heavily optimized. Use it in findnull.
This is second attempt, similar to CL97523.
In this version we never call IndexByte on region of memory,
that crosses page boundary. A bit slower than CL97523,
but still fast:

name        old time/op  new time/op  delta
GoString-6   164ns ± 2%   118ns ± 0%  -28.00%  (p=0.000 n=10+6)

findnull is also used in gostringnocopy,
which is used in many hot spots in the runtime.

Fixes #23830

Change-Id: Id843dd4f65a34309d92bdd8df229e484d26b0cb2
Reviewed-on: https://go-review.googlesource.com/98015
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-03-09 19:37:39 +00:00
..
errors cmd/go: accept only limited compiler and linker flags in #cgo directives 2018-02-07 15:35:57 +00:00
fortran *.bash: always use the same string equality operator 2017-03-14 21:46:31 +00:00
gmp all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
life test/run: use go tool compile + link instead of go run when possible 2017-10-31 13:21:05 +00:00
nocgo
stdio test/run: use go tool compile + link instead of go run when possible 2017-10-31 13:21:05 +00:00
test runtime: use bytes.IndexByte in findnull 2018-03-09 19:37:39 +00:00
testasan
testcarchive cmd/go: correct buildmode test (from "c-header" to "c-shared") 2018-01-11 19:24:35 +00:00
testcshared misc/cgo/testcshared: increase sleep in TestUnexportedSymbols 2018-02-14 15:03:29 +00:00
testgodefs cmd/cgo: add -srcdir option 2016-10-30 19:14:08 +00:00
testplugin misc/cgo/testplugin: unskip test 2017-12-06 18:57:07 +00:00
testsanitizers all: use Fatalf instead of Fatal if format is given 2018-01-10 01:35:45 +00:00
testshared cmd/go: make gccgo -buildmode=shared and -linkshared work again 2018-01-12 05:25:55 +00:00
testsigfwd misc/cgo/testsigfwd: add missing return statement 2016-08-30 21:44:14 +00:00
testso
testsovar
testtls all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00