On February 23, 2019 12:39:42 AM PST, Peter Zijlstra <pet...@infradead.org> wrote: >On Fri, Feb 22, 2019 at 03:39:48PM -0800, h...@zytor.com wrote: >> Objtool could also detect CLAC-STAC or STAC-CLAC sequences without >> memory operations and remove them; don't know how often that happens, >> but I know it *does* happen. > >Objtool doesn't know about memops; that'd be a lot of work. Also, >objtool doesn't actually rewrite the text, at best it could warn about >such occurences.
It doesn't even have to change the text per se, just nullify the altinstr. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
