Strange optimization results

[Дмитрий Оксенчук]

I have tested performance of std::string compare methods and get
strange results. With -O2 optimization std::string::compare 30 times
faster then operator==. With -Os optimization operator== 5 times
faster then std::string::compare. Is this bug or feature?

Full table (time for 10000000 comparisons in seconds):
			-O0		-O1		-O2		-O3		-Os
compare		1.069	1.057	0.029	0.025	1.072
operator== 	0.461	0.990	0.980	1.022	0.201

g++ (Debian 4.3.4-6) 4.3.4. Test code attached.
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