>>> On 25.01.18 at 15:12, <andrew.coop...@citrix.com> wrote: > On 25/01/18 13:08, Jan Beulich wrote: >> It may also be worthwhile again to pull up the zeroing of %edx, >> using %dl instead of $0 in the movb (and maybe then also >> similarly in DO_SPEC_CTRL_EXIT_TO_XEN, but there I'm less >> certain it couldn't have a negative effect). > > What negative effects are you worried about? These macros are self > contained.
The result of the xor then is an input to the cmp, which may be one cycle more latency than with the immediate zero. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
