On Thu, Mar 9, 2017 at 2:42 PM, Steven Rostedt <rost...@goodmis.org> wrote: > From: "Steven Rostedt (Red Hat)" <rost...@goodmis.org> > > Linus mentioned that doing two compares can be replaced by a single > compare. That is, instead of: > > movq $repeat_nmi, %rdx > cmpq 8(%rsp), %rdx > ja not_in_region > movq $end_repeat_nmi, %rdx > cmpq 8(%rsp), %rdx > ja in_region > > we can replace that with: > > movq 8(%rsp), %rdx > subq $repeat_nmi, %rdx > cmpq $end_repeat_nmi-repeat_nmi, %rdx > jb in_region
Seems reasonable to me. Good luck ever noticing the speedup :) --Andy
