uopt(5)

NAME
     uopt - the ucode optimizer

DESCRIPTION
     The U-code optimizer, uopt, is a part of the compiling system and is
     always invoked from one of the normal commands, such as cc(1), f77(1), or
     pc(1).  These compilers and others are referred to as the driver below.

     Ordinarily, only options mentioned on the driver man page or the IRIS-4D
     Series Compiler Guide are of interest.  However uopt has the following
     options not recognized by the driver which can be applied with  the flag
     prefix -Wo,.  For example, to prevent loop unrolling completely from cc,
     use cc -Wo,-loopunroll,0.  For driver programs other than cc, f77, and
     pc, see the appropriate man page  to see how to pass options to a
     compiler pass.

     While the following are available in this release, there is no guarantee
     that these will have the same names or even be available or in future
     releases.


     -loopunroll count
          Each loop which uopt can unroll is unrolled count times.  Set count
          to 0 to prevent loop unrolling.  One might wish to prevent loop
          unrolling where one discovered through testing that unrolled loops
          were slower (possibly due to cache effects) or where code size
          reduction was critical.  Defaults to 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), pc(1), f77(1), IRIS-4D Series Compiler Guide