[LLVMdev] [PATCH] Before/After IR Dumps

[David Greene]

This set of patches adds support for dumping IR before or after specified 
Passes.  It adds the following command-line options:

-print-before=<pass-option>
-print-after=<pass-option>
-print-before-all
-print-after-all

Use it like this:

llc -debug -print-before=linearscan-regalloc file.bc -o file.s

-help will print the pass options available to -print-before and -print-after.

The patches add support to clang, llvm and llvm-gcc, respectively.

We use this extensively to debug Passes by examining IR before and after
they run.

Please review for commit and comment.  It would be great to get this into the 
2.7 release.

Thanks!

                                               -Dave

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