llvm dev - May 2012 - [LLVMdev] TestSuite reports automatic comparison

Hi guys!
Is there any automatic way to generate the *comparison* report between 
two test-reports?
I mean the tool that automatically generates something like this:

1 = some-file-at-left.json
2 = some-file-at-right.json

         1:compile | 1: exec | 2: compile | 2: exec | %compile | %exec
Burg   | 1.21     | 0       | 1.13       | 0       | -6.7%    | -
ldecod | 6.71     | 0.06    | 6.88       | 0.064   | 2.5%     | 6.7%

And so on..

thanks!

-Stepan.