Using Advanced Optimization Options

Several advanced optimization options can be specified on the same command line. For example, the following command line specifies aggressive level 3 optimizations with unrestricted compile time, disables software pipelining, and disables moving conditional floating-point instructions out of a loop:

cc +O3 +Oaggressive +Onolimit +Onomoveflops +Onopipeline \
   sourcefile.c

Specify the level of optimization first (+O1, +O2, +O3, or +04), followed by any +O[no]optimization options.