llvm dev - Apr 2005 - [LLVMdev] Questions !!

Thanks for the reply,
 
Actually I m aiming towards determining two values:
 
- number of basic blocks in a program 
For this I have used Statistic facility provided in llvm and increasing the
counter for each basic block for each function.but for some reason , I m getting
different number everytime !!
Is Statistic is the right way to do it ?
 
- Average basic block size in a program ( in bytes)
 
Any suggestions to make it simple and get an accurate result?
 
Regards,
Tanu


Chris Lattner <sabre at nondot.org> wrote:
On Tue, 5 Apr 2005, Tanu Sharma wrote:
> There is tool that calculates execution count and total number of blocks 
> , is there anything available to detemine size of basic blocks in a 
> program in bytes?
Are you talking about native code? If you run the 'size' utility in
unix,
the 'tex' value is the number of bytes of program code. If you're
talking
about llvm code, I'm not sure what you mean "size of basic blocks in a 
program in bytes".

-Chris

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

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On Thu, 7 Apr 2005, Tanu Sharma wrote:
> Thanks for the reply,
>
> Actually I m aiming towards determining two values:
>
> - number of basic blocks in a program For this I have used Statistic 
> facility provided in llvm and increasing the counter for each basic 
> block for each function.but for some reason , I m getting different 
> number everytime !! Is Statistic is the right way to do it ?
That should work fine.  Remember that statistics accumulate across the 
whole execution of the tool though, they are not reset per function. 
Also, you might want to check out the -instcount pass.  It prints BB 
counts among other things.

For a small .ll file, it prints:

$ llvm-as < t.ll | analyze -instcount -stats
Printing analysis 'Counts the various types of Instructions' for
function
'test':
===-------------------------------------------------------------------------==  
... Statistics Collected ...
===-------------------------------------------------------------------------==
1 instcount - Number of Cast insts
1 instcount - Number of Store insts
1 instcount - Number of SetLT insts
1 instcount - Number of Ret insts
1 instcount - Number of memory instructions
1 instcount - Number of non-external functions
1 instcount - Number of basic blocks
4 instcount - Number of instructions (of all types)

> - Average basic block size in a program ( in bytes)
> Any suggestions to make it simple and get an accurate result?
What are you trying to measure?  The in-memory footprint of hte LLVM IR? 
The number of bytecode bytes?  The number of machine code bytes for some 
target?

-Chris
>
> Regards,
> Tanu
>
>
> Chris Lattner <sabre at nondot.org> wrote:
> On Tue, 5 Apr 2005, Tanu Sharma wrote:
>
>> There is tool that calculates execution count and total number of
blocks
>> , is there anything available to detemine size of basic blocks in a
>> program in bytes?
>
> Are you talking about native code? If you run the 'size' utility in
unix,
> the 'tex' value is the number of bytes of program code. If
you're talking
> about llvm code, I'm not sure what you mean "size of basic blocks
in a
> program in bytes".
>
> -Chris
>
>
-Chris

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