cmd/compile: loop over []byte slowdown on amd64 #22698
Labels
FrozenDueToAge
NeedsInvestigation
Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Performance
What version of Go are you using (go version)?
What operating system and processor architecture are you using (go env)?
/proc/cpuinfo:
model name : Intel(R) Xeon(R) CPU E5-2609 v3 @ 1.90GHz
What did you do?
While comparing 1.9 vs tip performance I've noticed some performance regressions:
compress/flate/Encode/Twain/Huffman/1e4 92.8µs ± 0% 102.5µs ± 2% +10.50%
mime/quotedprintable/Writer 9.65µs ± 1% 11.05µs ± 2% +14.52% (p=0.000 n=8+8)
Bisecting points to 743117a
I didn't check if those regressions really cause worse code or is this is just an effect of code alignment/some other unrelated change.
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