Enable optimizations for speed. This is the generally recommended optimization level. This option also enables: - Inlining of intrinsics - Intra-file interprocedural optimizations, which include: - inlining - constant propagation - forward substitution - routine attribute propagation - variable address-taken analysis - dead static function elimination - removal of unreferenced variables - The following capabilities for performance gain: - constant propagation - copy propagation - dead-code elimination - global register allocation - global instruction scheduling and control speculation - loop unrolling - optimized code selection - partial redundancy elimination - strength reduction/induction variable simplification - variable renaming - exception handling optimizations - tail recursions - peephole optimizations - structure assignment lowering and optimizations - dead store elimination