With gfortran you can use the -fexternal-blas compiler flag, which inserts calls to BLAS in place of the intrinsic matmul function above a certain matrix size. In addition you have to link an optimized BLAS library:
| Library | Link flags | Comment |
|---|---|---|
| OpenBLAS | -lopenblas |
|
| BLIS | -lblis |
|
| Intel oneMKL | see Link Line Advisor for OneMKL | for Intel processors |
| Accelerate | -framework Accelerate |
for macOS |
| AOCL-BLAS | -lblis |
for AMD processors; derived from BLIS |
| Arm Performance Libraries | -larmpl_lp64 |
for Arm processors |
| MATLAB BLAS | -lmwblas |
for MATLAB MEX functions |