1. Compiler Flags	  

	-WM,-Oall
	     Performs all safe and generally applicable optimizations 
	     including interprocedural optimizations, register allocation
	     across function calls and feedback directed optimizations
	     (function inlining, procedure positioning, branch elimination, 
	     procedure splitting, register allocation and cross basic block
             scheduling).  This flag also directs the compiler to produce 
	     nonposition-independent code, to generate code using the 
	     instruction set of the MIPS2 ISA, to inline alloca, printf, 
	     memcpy and memmove and to use U-code system libraries (these 
	     libraries represent the same system services as their regular 
	     counterparts, but in a form more suitable for interprocedural 
	     optimization).

	-WM,-G<num>
	     Specifies that data items smaller than <num> bytes in
	     size should be placed in the global data area and accessed
	     using a faster addressing mode.

	-Wo,-loopunroll,<num>    
	     Tells the optimizer to unroll loops <num> times.

	-Wo,unrolllimit,<num>      
	     <num> is the limit on the number of instructions within a 
             loop unrolled by the optimizer.

	-Wg,-Olimit,<num>	  
	     Sets a size threshold for inlining.  A call will not be
	     inlined if the resulting function (after inlining) exceeds 
	     <num> basic blocks.
	     
	-qfeedback
	     Produce code that collects call graph and flow graph
	     information suitable for feedback directed optimization.


2. Linker Flags:

	-dn  This option is passed to ld.  It specifies static linking 
             in the link editor.

3. Portability Flags:

    -DI_TIME
    -DI_SYS_TIME
	     Enables certain source code parts via conditional
	     compilation.