Re: [boost] bug in 1.35's sp_counted_base_gcc_sparc.hpp

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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