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cmd/compile: Investigate regression in vs 1.13 #37429

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dr2chase opened this issue Feb 24, 2020 · 1 comment
Open

cmd/compile: Investigate regression in vs 1.13 #37429

dr2chase opened this issue Feb 24, 2020 · 1 comment
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@dr2chase
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@dr2chase dr2chase commented Feb 24, 2020

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

go1.14-almost

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

Linux, AMD64, does not have the recent Intel microcode update (does not need it as far as I can tell).

What did you do?

This is a do-not-forget performance note.
Somewhere during 1.14 development, performance of the "bent" benchmark

github.com/ethereum/go-ethereum/common/bitutil
Encoding4KBVerySparse

got worse by about 9% (it varies). According to bisection this was linked to
insertion of a dead code phase in the compiler to improve debugging output but I have not tracked down the exact cause. It could be related to branch alignment, but superficially it "makes no sense".

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@dmitshur dmitshur commented Feb 25, 2020

@dmitshur dmitshur added this to the Go1.15 milestone Feb 25, 2020
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