GIMPLE alias improvements for GCC 4.5

We present the evolution of alias analysis in GCC, introducing the new alias representation on GIMPLE and the GIMPLE alias-oracle. In particular we compare in detail the advantages and disadvantages of different levels of precision in the memory SSA form.

After introducing the GIMPLE alias-oracle future possible enhancements are outlined and the work is related to lowering the memory accesses in GIMPLE and unifying the RTL and GIMPLE alias-oracles.

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