Page MenuHomeFreeBSD
Differential D45330

subr_pctrie: use ilog2(x) instead of fls(x)-1
ClosedPublic
Actions

Authored by dougm on May 24 2024, 5:01 AM.
Tags
None
Referenced Files
Unknown Object (File)
Wed, May 20, 7:50 PM
Unknown Object (File)
Mon, May 18, 5:30 AM
Unknown Object (File)
Mon, May 18, 5:24 AM
Unknown Object (File)
Sun, May 10, 6:43 PM
Unknown Object (File)
Sun, May 10, 5:28 AM
Unknown Object (File)
Sun, May 10, 1:29 AM
Unknown Object (File)
Sun, May 10, 1:22 AM
Unknown Object (File)
Sat, May 9, 7:35 PM
View All Files
Subscribers
imp
olce

Details

Reviewers
alc
Commits
rG749c249dc3b6: subr_pctrie: use ilog2(x) instead of fls(x)-1
rG574ef6506950: subr_pctrie: use ilog2(x) instead of fls(x)-1
Summary

In a GENERIC-NODEBUG kernel, each instance of using ilog2 in place of fls()-1 saves about 4 amd64 instructions, including a conditional, and 16 or so bytes.

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Not Applicable
Unit
Tests Not Applicable

Revision Contents
Changeset List

PathSize
sys/
kern/
6 lines
vm/
4 lines
5 lines
2 lines
123 lines
33 lines

Diff 139371

View Options

sys/kern/subr_pctrie.c

Loading...
View Options

sys/vm/_vm_phys.h

Loading...
View Options

sys/vm/vm_page.c

Loading...
View Options

sys/vm/vm_phys.h

Loading...
View Options

sys/vm/vm_phys.c

Loading...
View Options

sys/vm/vm_reserv.c

Loading...