Re: [PATCH] MIPS: Handle removal of 'h' constraint in GCC 4.4

[Florian Fainelli <florian@openwrt.org>]

Le Saturday 27 December 2008 16:19:40 Richard Sandiford, vous avez écrit :
> "Maciej W. Rozycki" <macro@linux-mips.org> writes:
> > On Wed, 17 Dec 2008, David Daney wrote:
> >> This is an incomplete proof of concept that I applied to be able to
> >> build a 64 bit kernel with GCC-4.4.  It doesn't handle the 32 bit case
> >> or the R4000_WAR case.
> >
> >  The R4000_WAR case can use the same C code -- GCC will adjust code
> > generated as necessary according to the -mfix-r4000 flag.  For the 32-bit
> > case I think the conclusion was the only way to get it working is to use
> > MFHI explicitly in the asm.
>
> No, the same sort of cast, multiply and shift should work for 32-bit
> code too.  I.e.:
>
>               usecs = ((uint64_t)usecs * lpj) >> 32;
>
> It should work for both -mfix-r4000 and -mno-fix-r4000.

Any updates on this ?
-- 
Best regards, Florian Fainelli
Email : florian@openwrt.org
http://openwrt.org
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