Differential D20102

Use fls to avoid a loop in isqrt
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Authored by dougm on Apr 30 2019, 6:12 AM.

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markj
kib

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rS347043: fls() should find the most significant bit of an int faster than a

Summary

fls() should find the most significant bit of an int faster than a linear search can, so use it to avoid a linear search in isqrt.

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rS FreeBSD src repository - subversion

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dougm created this revision.Apr 30 2019, 6:12 AM

kib accepted this revision.Apr 30 2019, 10:52 AM

This revision is now accepted and ready to land.Apr 30 2019, 10:52 AM

markj accepted this revision.Apr 30 2019, 2:17 PM

Closed by commit rS347043: fls() should find the most significant bit of an int faster than a (authored by dougm). · Explain WhyMay 3 2019, 2:56 AM

This revision was automatically updated to reflect the committed changes.

Herald added a subscriber: imp. · View Herald TranscriptMay 3 2019, 2:56 AM

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head/

sys/

vm/

vm_pageout.c

4 lines

Diff 56989

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Use fls to avoid a loop in isqrtClosedPublicActions