b975d0baa0
When mutating a byte slice, mutate in place, and only allocate once if
the slice's capacity is less than the maximum size.
mutateBytes already should not allocate; we check a post-condition
that the slice's data pointer does not change.
This speeds up the mutator from 4 ms per value to 200-600 ns. For
example:
goos: darwin
goarch: amd64
pkg: internal/fuzz
cpu: Intel(R) Core(TM) i7-8559U CPU @ 2.70GHz
BenchmarkMutatorBytes/1-8 5908735 275.3 ns/op
BenchmarkMutatorBytes/10-8 5198473 282.0 ns/op
BenchmarkMutatorBytes/100-8 4304750 233.9 ns/op
BenchmarkMutatorBytes/1000-8 4623988 295.2 ns/op
BenchmarkMutatorBytes/10000-8 4252104 458.5 ns/op
BenchmarkMutatorBytes/100000-8 1236751 950.8 ns/op
PASS
ok internal/fuzz 12.993s
Change-Id: I4bf2a04be6c648ef440af2c62bf0ffa3d310172c
Reviewed-on: https://go-review.googlesource.com/c/go/+/306675
Trust: Jay Conrod <jayconrod@google.com>
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Katie Hockman <katie@golang.org>
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| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| AUTHORS | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| SECURITY.md | ||
| codereview.cfg | ||
| favicon.ico | ||
| robots.txt | ||
README.md
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