On Fri, 21 Dec 2007, Lennart Sorensen wrote:
> On Thu, Dec 20, 2007 at 05:56:19PM -0500, linux-os (Dick Johnson) wrote:
>> Okay. Thanks! I need to do that.
>
> On the (now somewhat old) 2.6.18 kernel I use it is an option under
> "Processor type and features" called "Use register arguments", but yeah
> it isn't an option anymore in new kernels.
>
> As for your argument that it isn't a good idea, well most of the time
> the arguments you want to pass to a function are already values you were
> just working with to get them ready for the function, so quite likely
> they are already in the registers you are worried about having to clear
> first. Add to that the ability of modern x86 CPUs to use rename
> registers to fake stack accesses in some cases and the clearing of the
> registers become pretty much a non issue, at least that's my
> understanding of how things work.
>
> --
> Len Sorensen
>
If the procedures in different files or are in libraries, there
is no way for the compiler to "know."
Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_
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