[ale] GCC options...

[Doug McNash]

I believe -mcpu is pretty meaningless on a CISC (vs RISC) 
processor.  -march may allow the complier to emit 
instructions special to that version of the processor 
which in 99% of the time is meaningless on the x86 but I 
have not examined the output of the latest compilier/CPU 
combinations.  That 1% can be significant.  You can't lose 
anything but portability and ease of maintaince by 
specifing -march=.

Try it an see.  You would be better off unrolling loops, 
having loop code fit inside a cache line, testing which is 
faster a for(), while() or do {} while() and avoiding 
tests i.e. if() and switch()==a cascade of if()'s, put the 
most likely match up first. A while loop is usually faster 
but I have seen a case where a do-while was faster. In 
other words reviewing your code will produce better gains. 


--
Doug McNash <dmcnash at yahoo.com>
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