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Hello all, There is a missing vectorization opportunity issue with clang 4.0 with the file attached. Indeed, when compiled with -O2, the "op_distance" function get vectorized, but not the "op" one. For information, this test case has been reduced from a file generated by the Pythran compiler (https://github.com/serge-sans-paille/pythran). If we take a look at the generated IR without vectorization (using the -fno-vectorize clang flag), we get: > $ clang -O2 -S -emit-llvm op_zip_iterator.cpp -std=c++11 -o - -fno-vectorize > ; Function Attrs: norecurse uwtable > defi...