cmd/compile: investigate performance regression vs Go 1.13 #37429
Labels
compiler/runtime
Issues related to the Go compiler and/or runtime.
NeedsInvestigation
Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Performance
Milestone
What version of Go are you using (
go version
)?Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (
go env
)?What did you do?
This is a do-not-forget performance note.
Somewhere during 1.14 development, performance of the "bent" benchmark
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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