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cmd/compile: unneeded bounds checks #34816

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mariecurried opened this issue Oct 10, 2019 · 0 comments
Open

cmd/compile: unneeded bounds checks #34816

mariecurried opened this issue Oct 10, 2019 · 0 comments
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@mariecurried
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@mariecurried mariecurried commented Oct 10, 2019

What version of Go are you using (go version)?

$ go version
go version devel +2197321 Tue Oct 8 23:53:55 2019 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes.

What did you do?

I compiled the following functions to check if there were any bounds checks: https://godbolt.org/z/RSrNwR.

What did you expect to see?

I expected to see no bounds checks.

What did you see instead?

Instead, I see 7 different bounds checks generated by the Go compiler (highlighted in the site above).
I talked with @zdjones about this and it appears like all these bounds checks can be removed.

@agnivade agnivade added NeedsInvestigation Performance labels Oct 10, 2019
@ALTree ALTree added this to the Unplanned milestone Dec 4, 2019
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