Re: [boost] [Block Pointer] benchmark

Subject: Re: [boost] [Block Pointer] benchmark
From: Phil Bouchard (philippe_at_[hidden])
Date: 2011-05-26 16:45:13

On 5/25/2011 5:42 PM, Darren Garvey wrote:
>
> I believe he has already (modulo if he incorporated the minor change I
> mentioned):
> https://svn.boost.org/svn/boost/sandbox/block_ptr/libs/smart_ptr/example/benchmark.cpp
>
> I agree though, it isn't clear that your code is representative of "real"
> code. You should try not using templates - which take function pointers - to
> do the work and inline the code into the tests *.
>
> It would be interesting to see the assembly produced by your compiler (I'm
> not sure you've said which one you're using) in a fully optimised release
> build of the tests too, just to see what's going on under the hood.

Sorry for the delay but here is the assembler dump in release mode of 
both functions:

*** worked_make ***:
push   %r12
xor    %r12d,%r12d
push   %rbp
xor    %ebp,%ebp
push   %rbx
nopl   0x0(%rax)
mov    $0x4,%edi
callq  0x405288 <_Znwm_at_plt> (operator new)
mov    %rax,%rbx
xor    %edi,%edi
callq  0x405058 <_ZdlPv_at_plt> (operator delete)
cmp    %rbx,%r12
je     0x406464 <void worker_make<std::auto_ptr<int>, 
&(std::auto_ptr<int> make_auto<int>())>()+52>
mov    %r12,%rdi
mov    %rbx,%r12
callq  0x405058 <_ZdlPv_at_plt> (operator delete)
xor    %edi,%edi
add    $0x1,%ebp
callq  0x405058 <_ZdlPv_at_plt> (operator delete)
cmp    $0x186a0,%ebp
jne    0x406440 <void worker_make<std::auto_ptr<int>, 
&(std::auto_ptr<int> make_auto<int>())>()+16>
pop    %rbx
pop    %rbp
mov    %r12,%rdi
pop    %r12
jmpq   0x405058 <_ZdlPv_at_plt> (operator delete)
mov    %rax,%rbx
mov    %r12,%rdi
callq  0x405058 <_ZdlPv_at_plt> (operator delete)
mov    %rbx,%rdi
callq  0x405298 <_Unwind_Resume_at_plt>

*** worker_new ***:
push   %r12
xor    %r12d,%r12d
push   %rbp
xor    %ebp,%ebp
push   %rbx
nopl   0x0(%rax)
mov    $0x4,%edi
callq  0x405288 <_Znwm_at_plt> (operator new)
cmp    %rax,%r12
mov    %rax,%rbx
je     0x405e4d <void worker_new<std::auto_ptr<int>, int>()+45>
mov    %r12,%rdi
mov    %rbx,%r12
callq  0x405058 <_ZdlPv_at_plt> (operator delete)
add    $0x1,%ebp
cmp    $0x186a0,%ebp
jne    0x405e30 <void worker_new<std::auto_ptr<int>, int>()+16>
pop    %rbx
pop    %rbp
mov    %r12,%rdi
pop    %r12
jmpq   0x405058 <_ZdlPv_at_plt> (operator delete)
mov    %rax,%rbx
mov    %r12,%rdi
callq  0x405058 <_ZdlPv_at_plt> (operator delete)
mov    %rbx,%rdi
callq  0x405298 <_Unwind_Resume_at_plt>

-Phil