On Sat, Mar 05, 2016 at 11:37:21AM +0800, 张云 wrote: > > On Mar 4, 2016, at 11:59 PM, Dave Tian <dave.jing.tian@xxxxxxxxx> wrote: > > This ‘P’ is used to make gcc happy and work. > Without ‘P’, this inline would be interpreted as: > leal $-512(%esp), %eax > With ‘P’, this inline is the thing we really want: > leal -512(%esp), %eax > > Eventually, my gcc 4.9.2 does not compile with ‘P’ is missing. I am not > sure if this is still the case for newer gcc (5/6). But you get the point. > > -daveti > > Thank you for your detailed answer ! > > By the way， If someone have the problems alike, I suggest them to write some > inline assembly and check the compiler’s assembly output. Didn't get different outputs here, do you have updates? -- Adam Lee http://adam8157.info _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
