[cfe-dev] PCRE compiles fines and passes the test suite :)

[Nuno Lopes]

>>>> ---
>>>> compiler   | compile+link time | test suite run time | binary size
>>>> gcc 4.1    |      17s          |       1.9s          |    43KB
>>>> clang+llvm |    1m 13s         |       1.4s          |    188KB
>>>> ---
>>>>
>>>> Although llvm is much slower at compiling (the linking part seems  to 
>>>> be
>>>> really slow due to the -O2 optimizations), the binary produced is  much
>>>> faster :)
>>>>
>>>
>>> This doesn't makes sense to me. Are you using an optimized "release"
>>> version of clang?
>>
>> no, it was a debug build. With a release build of llvm, it takes  only 10
>> seconds to build pcre! It's even faster than gcc 4.1 :)
>> Of course this could still be better because of the overhead of the  ccc
>> script.
>>
>
> Much better...:-) I'd be surprised if ccc is introducing much  overhead. 
> The best way to know is to measure. If you are running on  Mac OS X, Shark 
> is a wonderful performance analysis tool to tell us  exactly where the 
> overhead is.

:)
no, I don't have a mac (please don't ban me :P). I don't really know any 
similar tools on linux. (K)cachegrind is nice, but is slow as hell.

Nuno