On 5/26/2011 4:19 PM, Phil Bouchard wrote:
I'm not sure what it is deleting.
If I examine worker_make used with block_ptr it's obvious it creates temporaries all over the place and there is no such RVO: push %r15 xor %r15d,%r15d push %r14 push %r13 push %r12 push %rbp push %rbx sub $0x48,%rsp lea 0x10(%rsp),%rax mov %rax,%rdi mov %rax,0x8(%rsp) callq 0x408a30 <block_ptr> lea 0x20(%rsp),%rax mov %rax,(%rsp) mov %rax,%rdi nop callq 0x4094f0 <boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>()> callq 0x407c60 <boost::detail::bp::block_header::static_mutex()> mov %rax,%rdi mov %rax,%r14 callq 0x405258 <pthread_mutex_lock@plt> test %eax,%eax jne 0x409d34 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+804> mov 0x18(%rsp),%rdx mov 0x8(%rdx),%rcx mov 0x8(%rcx),%rax cmp %rax,%rcx jne 0x409a74 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+100> jmp 0x409a81 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+113> mov %rcx,%rax mov %rax,0x8(%rdx) mov 0x8(%rax),%rcx cmp %rax,%rcx jne 0x409a71 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+97> mov 0x28(%rsp),%rsi mov 0x8(%rsi),%rdx mov 0x8(%rdx),%rax cmp %rax,%rdx jne 0x409a98 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+136> jmp 0x409aa5 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+149> mov %rdx,%rax mov %rax,0x8(%rsi) mov 0x8(%rax),%rdx cmp %rax,%rdx jne 0x409a95 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+133> cmp %rdx,%rcx je 0x409ba9 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+409> xor %esi,%esi mov 0x8(%rsp),%rdi callq 0x408500 <boost::detail::bp::block_ptr<int>::release(bool)> mov 0x28(%rsp),%rcx mov 0x8(%rcx),%rdx mov 0x8(%rdx),%rax cmp %rax,%rdx jne 0x409ad3 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+195> jmp 0x409ae0 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+208> xchg %ax,%ax mov %rdx,%rax mov %rax,0x8(%rcx) mov 0x8(%rax),%rdx cmp %rax,%rdx jne 0x409ad0 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+192> mov 0x18(%rsp),%rcx mov 0x8(%rcx),%rsi mov 0x8(%rsi),%rax cmp %rax,%rsi jne 0x409af7 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+231> jmp 0x409b04 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+244> mov %rsi,%rax mov %rax,0x8(%rcx) mov 0x8(%rax),%rsi cmp %rax,%rsi jne 0x409af4 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+228> cmp %rsi,%rdx je 0x409ba9 <void worker_make<boost::detail::bp::block_ptr<int>, &(boost::detail::bp::block_ptr<int> boost::detail::bp::make_block<int>())>()+409> lea 0x28(%rsi),%r8 ... -Phil