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Daniel Martí f53137f95c internal/profile: use internal/lazyregexp for the legacy parser 
Per benchinit, this makes a big difference to init times:

	name             old time/op    new time/op    delta
	InternalProfile     185µs ± 1%       6µs ± 1%  -96.51%  (p=0.008 n=5+5)

	name             old alloc/op   new alloc/op   delta
	InternalProfile     101kB ± 0%       4kB ± 0%  -95.72%  (p=0.008 n=5+5)

	name             old allocs/op  new allocs/op  delta
	InternalProfile       758 ± 0%        25 ± 0%  -96.70%  (p=0.008 n=5+5)

The fixed 0.2ms init cost is saved for any importer of net/http/pprof,
but also for cmd/compile, as it supports PGO now.
A Go program parsing profiles might not even need to compile these
regular expressions at all, if it doesn't encounter any legacy files.
I suspect this will be the case with most invocations of cmd/compile.

Updates #26775.

Change-Id: I8374dc64459f0b6bb09bbdf9d0b6c55d7ae1646e
Reviewed-on: https://go-review.googlesource.com/c/go/+/460545
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2023-01-20 09:27:47 +00:00
.github .github: suggest using private browsing in pkgsite template 2023-01-03 18:52:47 +00:00
api runtime: replace panic(nil) with panic(new(runtime.PanicNilError)) 2023-01-19 22:21:50 +00:00
doc runtime: replace panic(nil) with panic(new(runtime.PanicNilError)) 2023-01-19 22:21:50 +00:00
lib/time time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
misc all: fix typos in go file comments 2023-01-20 03:27:26 +00:00
src internal/profile: use internal/lazyregexp for the legacy parser 2023-01-20 09:27:47 +00:00
test cmd/compile: AMD64v3 remove unnecessary TEST comparision in isPowerOfTwo 2023-01-20 04:58:59 +00:00
.gitattributes
.gitignore time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
codereview.cfg
CONTRIBUTING.md
go.env cmd/go: introduce GOROOT/go.env and move proxy/sumdb config there 2023-01-17 23:10:39 +00:00
LICENSE
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README.md README: update from CC-BY-3.0 to CC-BY-4.0 2022-11-02 20:14:56 +00:00
SECURITY.md

README.md

The Go Programming Language

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