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Re: [boehms-gc, libjava?] Update Boehm's GC to 6.8
On Fri, Aug 04, 2006 at 01:38:50PM -0700, Boehm, Hans wrote:
> The underlying problem is that this instruction has weird register
> constraints, as documented here. I'm not sure that this particular
> encoding into gcc asm notation is in any sense optimal.
When the assembler began checking this constraint we had to fix it in a
lot of places. I used this:
__asm__ __volatile__ ("swp %0, %1, [%2]"
: "=&r,&r" (result)
: "r,0" (newvalue), "r,r" (mem) : "memory");
The second operand can be the same as the first operand, or different,
but the third operand can never match the first operand.