On Wed, 22 Mar 2000, Dale Amon wrote:
> It may not yet concern the core kernel group but
> perhaps it soon will if things go well...
>
> I get a compile error from /drivers/block/loop_cast.c,
> part of the kerneli patches.
>
> It doesn't like:
>
> #if defined(__GNUC__) && (defined(i386) || defined(i486))
> __asm__ (
> "roll %%cl,%0"
> : "r" (data)
> : "0" (data), "c" (count)
> : "cx"
> );
> and so forth
>
> where the error occurs on the cx register:
>
> fixed or forbidden register 2 (cx) was spilled for class CREG.
>
> occurs many times before the kernel compiles bails out.
>
> Is there any trivial fix?
In this case, just delete the `: "cx"' line. There's no reason to have it
as "roll" doesn't modify cx, except of course if you're doing
`rol %cl,%ecx', which is unlikely but quite legal. BTW, the
"r" constraint can be relaxed to "g" here to give gcc a little more
latitude with register allocation.
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This archive was generated by hypermail 2b29 : Thu Mar 23 2000 - 21:00:37 EST