Lahey/GNU Fortran

-[n]unroll [limit]

Control loop unrolling

Compile only. Default: -unroll

GFortran option: -funroll-loops, --param max-unroll-times

Specify -unroll [limit] to control the level of loop unrolling.

limit is a number denoting the maximum level of loop expansion.

If limit is omitted, the value of limit is determined by the compiler.