[LLVMdev] Compilation without optimization

[Chris Lattner]

On Tue, 26 Apr 2005, Tanu Sharma wrote:
> Thanks !!
> But if i generate a .bc file like this and then run my pass over it like this :
>
> opt -load /home/llvm-cvs/llvm/Debug/lib/LLVMHello.so -hello <helloprog.bc> class_prog.bc
>
> Will the new .bc file (class_prog.bc) be also without optimizations ?opt 
> also does some optimizations.Can I control them ?

Opt is the universal modular optimizer.  It does exactly what you tell it 
to and nothing more.  In particular if you tell it to run just your pass, 
that is all it does.

-Chris


> Chris Lattner <sabre at nondot.org> wrote:
> On Mon, 25 Apr 2005, Tanu Sharma wrote:
>
>> Thanks for the reply.
>>
>> I wish to compile without optimizations ( the option being turned off )
>> but still generate bytecode file.
>>
>> Options -S , -c removes optimizations but I also need .bc file to
>> experiment and use further.
>
> Passing "-Wa,-disable-opt -Wl,-disable-opt" will disable *all* cleanup and
> optimizations done at the llvm level, leaving you with the truly horrible
> code that you desire :).
>
> -Chris
>
>> Chris Lattner wrote:
>> On Sat, 23 Apr 2005, Tanu Sharma wrote:
>>
>>> I got very useful replies from dev list regarding my earlier question
>>> but yet not able to determine block size. That I want in total size of a
>>> block in a function in bytes and not just the number of
>>> instructions.LLVM Tool gives most of the information e.g function bytes
>>> etc....but not individual block.
>>
>> If you want the size in machine code bytes, you are going to have to
>> generate an .s file and count the instructions.
>>
>> -chris
>>
>>> Chris Lattner wrote:
>>> On Fri, 22 Apr 2005, Tanu Sharma wrote:
>>>
>>>> Actually I started with hello.cpp povided as an example pass and
>>>> modified and made my pass which does randomization. I have been working
>>>> on it and running over programs and it always worked fine but now lately
>>>> i had checked out a newer version (llvm)which i believed was working
>>>> fine too but now as i did some modifications and tried to compile my
>>>> pass i got these errors.
>>>
>>> So you get the errors while compiling the pass? Did you recently upgrade
>>> your system GCC? It looks like it is configured wrong or is somehow
>>> broken.
>>>
>>>> Also I have yet not found a simple way to calculate basic block size in
>>>> a function.There are tools that give me function size in bytes etc etc
>>>> ....but not of basic block.I got reply that I have to see what my block
>>>> does and then calculate size...what does that mean ? iterating over
>>>> instructions and add the size of the instructions ?how do i determine
>>>> that ?
>>>
>>> Again, what "size" are you looking for? If you just want to figure out
>>> how many llvm instructions are in it, BB->size() should do the trick.
>>>
>>> -Chris
>>>
>>>> Chris Lattner wrote:
>>>> On Thu, 21 Apr 2005, Tanu Sharma wrote:
>>>>> I am trying to rum my pass (.cpp file) and I am getting the following error.
>>>>
>>>> Can you give a little more context about what you're doing?
>>>>
>>>> -Chris
>>>>
>>>>
>>>>> ----------------------------------------------------------------------------------------------------------------
>>>>>
>>>>> g++: /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../crti.o: No such file or directory
>>>>> g++: /usr/lib/gcc/i386-redhat-linux/3.4.2/crtbeginS.o: No such file or directory
>>>>> g++: /usr/lib/gcc/i386-redhat-linux/3.4.2/crtendS.o: No such file or directory
>>>>> g++: /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../crtn.o: No such file or directory
>>>>> ---------------------------------------------------------------------------------------------------------------
>>>>>
>>>>> It seems the error just appreared from nowhere.Earlier it was working fine.I had also checked out the latest version from cvs sometime back but feel I worked on that for sometime before this appeared.
>>>>>
>>>>> How can I fix it?Is it changing llvm parameters for c++ or requires patch or something fom linux?
>>>>>
>>>>> Thanks
>>>>>
>>>>> - T
>>>>>
>>>>> __________________________________________________
>>>>> Do You Yahoo!?
>>>>> Tired of spam? Yahoo! Mail has the best spam protection around
>>>>> http://mail.yahoo.com
>>>>
>>>> -Chris
>>>>
>>>>
>>>
>>> -Chris
>>>
>>>
>>
>> -Chris
>>
>>
>
> -Chris
>
>

-Chris

-- 
http://nondot.org/sabre/
http://llvm.cs.uiuc.edu/