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PCP - GCC Wiki - http://gcc.gnu.org/wiki/PCP
"PCP is the Polyhedral Compilation Package, a library that does translation of imperative programs accessing memory to a polyhedral representation and then does code generation using CLooG back to a more efficient imperative program. The objective function can be one or a combination of "max data reuse", "max parallelism", "min control flow", etc." ‎- silpol