vmul_c -- vector multiply using C arrays
     -1 -- view-view elementwise multiply -- float
     -2 -- view-view elementwise multiply -- complex<float>
     -6 -- view-view vector multiply      -- float
     -7 -- view-view vector multiply      -- complex<float>
    -11 -- scalar-view vector multiply    -- float
    -12 -- scalar-view vector multiply    -- complex<float>