Faster execution and compilation on native platform by using a set of options. 

"-fast"

Optimize performance--set optimization level 

"-O[n]"

Specify target hardware system. 

"-xtarget=t"

Collect or use data for a profile to optimize (SPARC).

"-xprofile=p"

Align COMMON block data and enable multi-word load/stores. (SPARC)

"-dalign"

Arithmetic--use simple arithmetic model. 

"-fsimple[=n]"

Arithmetic--use SPARC non-standard floating point (SPARC).

"-fns[={no|yes}]"

Use inline library 

"-libmil"

Traps--assume no memory-based traps (SPARC).

"-xsafe=mem"

Unroll loops--advise optimizer to unroll loops n times.

"-unroll=n"

Fast math--use special fast math routines (SPARC).

" -xlibmopt"

Architecture--specify target instruction set. 

"-xarch=a"

Chip--specify target processor.

"-xchip=c"

Check data dependencies--analyze loops (SPARC).

"-depend"

Inline the listed user routines to optimize for speed. 

"-inline=f1[,...fn]"

Optimize across all source files on command line 

" -xcrossfile [=n]"

Do no optimizations that increase code size.

"-xspace"