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Cuong Manh Le 7b30a2d268 cmd/compile: make isSmallMakeSlice checks slice cap only 
If slice cap is not set, it will be equal to slice len. So
isSmallMakeSlice only needs to check whether slice cap is constant.

While at it, also add test to make sure panicmakeslicecap is called
when make slice contains invalid non-constant len.

For this benchmark:

func BenchmarkMakeSliceNonConstantLen(b *testing.B) {
	len := 1
	for i := 0; i < b.N; i++ {
		s := make([]int, len, 2)
		_ = s

	}
}

Result compare with parent:

name                        old time/op  new time/op  delta
MakeSliceNonConstantLen-12  18.4ns ± 1%   0.2ns ± 2%  -98.66%  (p=0.008 n=5+5)

Fixes #37975

Change-Id: I4bc926361bc2ffeab4cfaa888ef0a30cbc3b80e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/226278
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2020-03-31 21:51:51 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api sync: add new Map method LoadAndDelete 2020-02-25 14:31:55 +00:00
doc cmd/go: add support for GOPROXY fallback on unexpected errors 2020-03-31 20:08:48 +00:00
lib/time lib/time: update tz data to 2019c 2019-11-26 12:03:08 +00:00
misc cmd/cgo, misc/cgo: only cache anonymous struct typedefs with parent name 2020-03-30 18:44:17 +00:00
src cmd/compile: make isSmallMakeSlice checks slice cap only 2020-03-31 21:51:51 +00:00
test cmd/compile: make isSmallMakeSlice checks slice cap only 2020-03-31 21:51:51 +00:00
.gitattributes build: force all Windows batch files to CRLF 2020-03-22 08:42:38 +00:00
.gitignore
AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.14 2020-02-21 19:59:34 +00:00
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SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

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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