Level 3: matrix-matrix subroutines include:
| SGEMM, DGEMM, CGEMM, ZGEMM | Perform matrix-matrix operations on general matrices. |
| SSYMM, DSYMM, CSYMM, ZSYMM | Perform matrix-matrix operations on symmetrical matrices. |
| CHEMM, ZHEMM | Perform matrix-matrix operations on Hermitian matrices. |
| SSYRK, DSYRK, CSYRK, ZSYRK | Perform symmetric rank k operations. |
| CHERK, ZHERK | Perform Hermitian rank k operations. |
| SSYR2K, DSYR2K, CSYR2K, ZSYR2K | Perform symmetric rank 2k operations. |
| CHER2K, ZHER2K | Perform Hermitian rank 2k operations. |
| STRMM, DTRMM, CTRMM, ZTRMM, | Perform matrix-matrix operations on triangular matrixes. |
| STRSM, DTRSM, CTRSM, ZTRSM | Solve certain matrix equations. |