GCC 6.1 Compiler Optimization Level Benchmarks: -O0 To -Ofast + FLTO

Here are some extra GCC 6.1 compiler benchmarks to share this weekend, complementing the recent GCC 4.9 vs. GCC 5 vs. GCC 6 comparison and the GCC 6.1 vs. Clang 3.9 compiler comparison.

These latest results are GCC 6.1 being tested on Linux x86_64 at various compiler optimization levels. Tested combinations included -O0, -Os, -Og, -O1, -O2, -O3, -O3 -march=native, -O3 -march=native -flto, -Ofast -march=native.

All the tests were done on the same Xeon E5-2687W v3 Haswell system running Debian Testing with Linux 4.5 and a hand-built GCC 6.1.0 compiler stack.

The results mostly come down to what one would expect...


See the dozens of compiler optimization benchmark results via this OpenBenchmarking.org result file.