uopt(5)

NAME
     uopt - The ucode optimizer

DESCRIPTION
     The ucode optimizer, uopt, is a part of the compiling system and is
     always invoked from one of the compiler commands, such as cc(1) or
     f77(1).

     uopt has the following options not recognized by the compilers, which
     can be applied with the prefix -Wo.  For example, to prevent loop
     unrolling completely with the C compiler, use cc -Wo,-loopunroll,0.
     For compiler commands other than cc or f77 see the appropriate man
     page.

     The following options are available:

     -loopunroll count
          Each loop which uopt can unroll is unrolled count times.  Set
          count  to 0 to prevent loop unrolling.  For example, you may want
          to prevent loop unrolling if you find that unrolled loops are
          slower (possibly due to cache effects) or where code size
          reduction is critical.  The default is count = 4.

     -unrolllimit limit
          Each loop which uopt can unroll is unrolled a maximum of limit
          times.  Defaults to 160.

FILES
     /usr/lib/uopt

SEE ALSO
     cc(1), f77(1),