Hi Roman,
FAIL: gfortran.dg/inline_matmul_1.f90 scan-tree-dump-times optimized "_gfortran_matmul" 0
With matmul, there are three versions you can get: The library version (called as _gfortran_matmul), the inline version or a direct call to the corresponding BLAS routine. Which one is called, and if there is a run-time selection between them, depends on -O and some other options. You'll need to look at the test case in detail. Regards Thomas