avr studio optimization
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发表于 11/23/2011 8:39:58 PM
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The current levels of optimization are:
-O0 No optimization. This is the same as not specifying any optimization.
-01 Optimize. Reduces code size and execution time without performing any optimizations that take a great
deal of compilation time.
-O2 Optimize even more. avr-gcc performs almost all optimizations that don't involve a space-time tradeoff.
-O3 Optimize yet more. This level performs all optimizations at -O2 along with -finline-functions and -
frename-registers.
-Os Optimize for size. Enables all -O2 optimizations that don't increase code size. It also performs
further optimizations designed to reduce code size.
今天看了一下，竟然工程用的是-Os，难刚开始定义变量的时候就出错了，一直以为新建工程的优化等级是-O0 ，
所有这些优化等级，-Os的优化最严重，对于48v来讲的话，选-O0 大小为总容量的130%几，选-O1 的话为120%
选-O2 的话为100%，选-O3 的话为110%，而选-Os 的话为90%，看来得好好‘优化’下了！
