How many ways to set a register to zero?

Question

I\'m curious how many ways are there to set a register to zero in x86 assembly. Using one instruction. Someone told me that he managed to find at least 10 ways to do it.

Answer 1

mov eax,0  
shl eax,32  
shr eax,32  
imul eax,0 
sub eax,eax 
xor eax,eax   
and eax,0  
andn eax,eax,eax 

loop $ ;ecx only  
pause  ;ecx only (pause="rep nop" or better="rep xchg eax,eax")

;twogether:  
push dword 0    
pop eax

or eax,0xFFFFFFFF  
not eax

xor al,al ;("mov al,0","sub al,al",...)  
movzx eax,al
...

Answer 2

You can set register CX to 0 with LOOP $.