Why doesn't GCC show vectorization information?

Question

I\'m using Codeblocks for a C program on Windows 7. The program is using the OMP library. GCC version is 4.9.2. Mingw x86_64-w64-mingw32-gcc-4.9.2.exe.

Flags used are: <

Answer 1

In GCC-9.0.0,Messages are now prefixed with optimizaed,missed,or note,rather than the old behavior of all being preixed with note. If want to get exhaustive log of all decisions made by the vectorizer via new -internals suboption of -fopt-info.