Playing with gcc's intermediate format?

You might find it easier to write a plugin for GCC, which would allow you to hook the GIMPLE generation and alter it inside GCC, which should drop the downtime of saving, editing then trying to compiler from GIMPLE form. MELT is one such plugin (though it offers way more than just altering the lower level representations). There is also a nice PDF here on GIMPLE altering plugins.

You can easily generate gimple representation of any file using the flag -fdump-tree-gimple. Its not a tough task. If you want to write a plugin then I think you might be interested in how passes work on gcc.

You can see the output of each pass on gimple.

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