On Fri, Jan 17, 2014 at 04:24:50PM +0100, Uros Bizjak wrote: > On Fri, Jan 17, 2014 at 3:50 PM, H.J. Lu <hjl.to...@gmail.com> wrote: > > > > Wrong example. It should be > > > > lea 0x400(%edx, %ecx, 8), %edx > > > > we get > > > > add %ecx, %edx > > add %ecx, %edx > > add %ecx, %edx > > add %ecx, %edx > > add %ecx, %edx > > add %ecx, %edx > > add %ecx, %edx > > add %ecx, %edx > > add $0x400, %edx > > Even for this example, the code can be substantially improved: > > shl $3, %ecx > add %ecx, %edx > add $0x400, %edx
Only if ecx is dead after the statement. Jakub