high level loop optimizations in gcc-4.1.2

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Hi,
     I know that linear loop transformations on tree 
representation can be enabled by -ftree-loop-linear
flag.

It is said that these transformations include
loop-interchange, reversal,skewing,scaling.
These transformations are done by apllying different 
transformation matrices. For example for
loop-interchange transfomation matrix is (0 1)
                                         (1 0)
            
1)Where can I find example programs for which
gcc-4.1.2 can do these transformations.

2) I have had a look at internal files. It seems that
gcc-4.1.2 can do only loop-interchange only.
Am I right?

3)If gcc-4.1.2 can do other transformations, what are
they? and how gcc-4.1.2 selects which particular
transformation matrix to apply??( Gcc can apply any
integer non-singular matrix theoretically.)





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