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

[Wu Zhangjin <wuzhangjin@gmail.com>]

Hi, 

On Thu, 2009-05-28 at 13:31 +0200, Florian Fainelli wrote:
> 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 ?

I have updated it to this PATCH, could you help to review it?



[loongson-PATCH-v2 20/23] add gcc
4.4 support for MIPS and loongson

thx!
Wu Zhangjin