CVS commit: src/sys/arch/alpha/alpha

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Thu Jul 22 15:48:40 UTC 2021

Modified Files:
        src/sys/arch/alpha/alpha: locore.s

Log Message:
It's unlikely that a process will be using restartable atomic sequences
on Alpha, and furthermore it's unlikely that any given context switch
will be returning to one even if the process has them.  So, re-arrange
the RAS processing in cpu_switchto() so that the most likely code paths
are predicted by the branch predictor.  On an EV4-class processor, this
will save ~4-6 cycles on just about every context switch.


To generate a diff of this commit:
cvs rdiff -u -r1.140 -r1.141 src/sys/arch/alpha/alpha/locore.s

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.