df557fe3ea
These regexes are all related to commands like get and build, so they're unnecessary for simpler commands like env. In particular, we need env to be fast, since libraries like go/packages call it early and often. Some external Go tools are interactive, so milliseconds matter. lazyregexp eagerly compiles the patterns when running from within a test binary, so there's no longer any need to do that as part of non-test binaries. Picking up the low-hanging fruit spotted by 'perf record' shaves off well over a full millisecond off the benchmark on my laptop: name old time/op new time/op delta ExecGoEnv-8 4.92ms ± 1% 3.81ms ± 0% -22.52% (p=0.004 n=6+5) This CL required adding a few more methods to the lazy regexp wrapper. Updates #29382. Change-Id: I22417ab6258f7437a2feea0d25ceb2bb4d735a15 Reviewed-on: https://go-review.googlesource.com/c/155540 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Bryan C. Mills <bcmills@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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