On Fri, Jan 17, 2014 at 06:19:37AM -0800, H.J. Lu wrote:
> ix86_split_lea_for_addr transforms a single LEA instruction into a series
> of MOV and ADD instructions. For
>
> lea 0x400(%eax, %ecx, 8), %edx
>
> we get
>
> mov %eax, %edx
> 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
Ugh, is that really want you want for silvermont, as opposed to (at least
if the output operand isn't equal to the base):
mov %ecx, %edx ! if base is equal to index this would go away
add %ecx, %edx
add %edx, %edx
add %edx, %edx
add %eax, %edx
add $0x400, %edx
?
Jakub
