On Mon, Mar 19, 2012 at 5:19 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
> movl %fs:0, %eax > movq c@gottpoff(%rip), %rdx > movzbl (%rax,%rdx), %edx > movb %dl, y(%rip) > movq w@gottpoff(%rip), %rdx > movzwl (%rax,%rdx), %eax > movw %ax, i(%rip) > ret > > It can be > > movq c@gottpoff(%rip), %rax > movzbl %fs:(%rax), %eax > movb %al, y(%rip) > movq w@gottpoff(%rip), %rax > movzwl %fs:(%rax), %eax > movw %ax, i(%rip) > ret This is just CSE in action. It CSEd movl %fs:0, %eax, since it has to be zero extended before going into address. Uros.
