Hi, I played with the example provided by Kumar Appaiah, and narrowed the problem down to zdrot; after copying zdrot.f into the same directory as zgesvd_ex.f: $ gfortran -O2 -c zgesvd_ex.f $ gfortran -O2 -c zdrot.f $ gfortran -o zgesvd_ex zgesvd_ex.o zdrot.o -llapack $ ./zgesvd_ex gives the expected result (with libblas3gf 1.2-4), but $ gfortran -O2 -ftree-vectorize -c zdrot.f $ gfortran -o zgesvd_ex zgesvd_ex.o zdrot.o -llapack $ ./zgesvd_ex gives the wrong result. This looks like a bug in the gcc vectorizer, and it cannot be reproduced with gcc 4.5 from experimental.
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