Re: Doh, compiler bug... (was Re: possible bug in kernel/if_ether.c)

[Thomas M. Sommers]

Matthew Dillon wrote:
> 
> :0xc01997a7 <arpintr+123>:       sete   %al
> :0xc01997aa <arpintr+126>:       movzbl %al,%ebx                BING BING BING!
> :0xc01997ad <arpintr+129>:       testl  %ebx,%ebx
> 
[snip] 
>      What the frig is this 'sete' instruction?  And the movzbl ?  Move byte
>      to long?
> 

sete is set byte if equal (zf set). movzbl is as you supposed, 
but with zero extend.


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