Re: [boost] [shared_Ptr] [1.34] URGENT: Outstanding HP-UX/itaniumbug

From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-03-22 17:52:06

Peter Dimov wrote:
> John Maddock wrote:
>
>> Program received signal SIGSEGV, Segmentation fault
>>  si_code: 1 - SEGV_MAPERR - Address not mapped to object.
>> 0x40601e1 in boost::detail::atomic_decrement (pw=0x40014bd4)
>>    at sp_counted_base_gcc_ia64.hpp:52
>
> The problem is that in
>
>    __asm__ ("     fetchadd4.rel %0=[%2],-1 ;; \n"
>
> the %2 register (r15 in my test) contains 0x40014bd4, while the
> address of *pw is actually 0x2000000040014bd4. Apparently g++ needs
> to be informed of the fact that %2 is an address register, not a data
> register. Now I only need to find out how to do that.

I fixed it. shared_ptr_test with -O0 -g still segfaults on td176, but this 
has nothing to do with the inline asm, as the same fault occurs 
with -DBOOST_SP_DISABLE_THREADS. shared_ptr_test -O2 works fine, as does 
smart_ptr_test. I tested the fix on the other IA64 testdrives as well, all 
seem to work. Committed to trunk.

OK to commit to branch?