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...ze", "Write comments in source file."); Note that I did NOT register my new pass in llvm/lib/Transforms/IPO/PassManagerBuilder.cpp - the original LoopVectorize module is registered there. However, when I give: opt -debug -load NewLoopVectorize.so -my-loop-vectorize test.c it does not vectorize a loop that was normally vectorized by the original LoopVectorize module in LLVM. My module gives: <<loop not vectorized: loop control flow is not understood by vectorizer LV: Not vectorizing: Cannot prove legality...