From: Jerry Lawson (Jerry.Lawson_at_[hidden])
Date: 2007-02-06 16:41:30
>
> Sounds like a gcc bug. Which versions of gcc have you tried?
>
I have gcc 4.1.1 on a solaris10 sparv9 machine (64 bit).
> > I'm done some experimenting and with the following code,
> gcc seems to
> > generate the proper code:
> >
> > inline int32_t compare_and_swap( int32_t * dest_, int32_t compare_,
> > int32_t swap_ ) {
> > __asm__ __volatile__( "cas [%2], %3, %0"
> >
> > : "=&r" (swap_)
> > : "0" (swap_), "r" (dest_), "r" (compare_)
> > : "memory" );
> >
> > return swap_;
> > }
>
> We might be able to use that as a fix if it works, but it's
> not correct in principle. One case where it fails is on 64
> bit machines that use 32 bit pointers. This may not be a
> problem on SPARCs though.
>
I'm not sure how one would go about using 32-bit pointers on a 64-bit
machine. Is that a gcc option or a hardwired thing in the processor?
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