Re: [PATCH] 498+ days uptime

Gabriel Paubert (paubert@iram.es)
Tue, 25 Aug 1998 18:23:40 +0200 (METDST)


On Tue, 25 Aug 1998, Jamie Lokier wrote:

> Incrementing a 64-bit value on i386 is fast and simple. It's arithmetic
> done in GCC, especially with temporaries that you have to worry about.
>
> The instruction sequence is:
>
> incl counter
> adcl $0,counter+4

Wrong, inc[bwl] and dec[bwl] don't affect the carry flag. You have to use
addl $1,counter (it's only 1 byte longer so nobody really cares).

Gabriel.

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