llvm dev - May 2012 - [LLVMdev] unable to decode llvmpro.out for path profiling

Hi, I am using Path Profiling to path profile a C code. I'm using this
commands:

$ llvm-gcc -c -emit-llvm file.c -o file.bc
$ opt --insert-hotpath-profiling file.bc -o file.ins.bc
$ llc -march=x86 file.ins.bc -o file.ins.s
$ gcc -I llvm2.9/runtime/PathProfling.c -I llvm2.9/runtime/CommonProfiling.c
$ ./a.out

This will give me path profile of of program in 'llvmpro.out'

to decode this profile data I tried as:
$ llvm-prof -A file.ins.bc llvmprof.out
 this gives error:
llvm-prof: Unknown packet type #5!

I also tried to decode the "llvmprof.out" manually and found that it
dumps
different profile data for different input files.

For example for bzip2.c is dumps like this:

*  Pty = 1*
*  SavedArgslength=10*
*  SavedArgs=(null)*
*  *
*  4*<unsigned> random data , that i cant figure out*
*  *
*  Profile Header: 5*
*  functionCount = 47*
*  Function Id = 4 NumPathsExecuted = 36*
*  path1 : count1*
*  path2 : count2 and so on...*
*
*
But also this format is not same for all input file. For gzip.c and gcc.c
it stores data in some different manner.

I urgently need some suggestions and solutions about this problem.

Thanks in advance
*
*
Gaurav Kumar
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Hi Guarav,

On 22/05/12 09:37, Gaurav Kumar wrote:
> to decode this profile data I tried as:
> $ llvm-prof -A file.ins.bc llvmprof.out
>   this gives error:
> llvm-prof: Unknown packet type #5!
As far as I'm aware the llvm-prof tool does not support path profiling data.

I am working on a Google "Summer of Code" project to improve support
for
profile guided optimisation (including path profiling).  I intend to fix 
this issue, but it is at the end of a long list of things to work on.

Regards,
Alastair.