On Tue, 2008-07-08 at 20:04 +0200, Christian Franke wrote: > With old gcc versions without the "rol" optimization, even the 16 bit > swap should be a function:
Or better yet, an asm statement. We should consider optimized assembly vs function call. Even the 32-bit swap could be shorter: a: 86 c4 xchg %al,%ah c: c1 c0 10 rol $0x10,%eax f: 86 c4 xchg %al,%ah 11: That's 7 bytes! And if written properly, it could work with any of the registers that allow access to the lower two bytes (%eax, %ebx, %ecx and %edx), thus giving more flexibility to the optimizer. -- Regards, Pavel Roskin _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
