gcc march参数 cpu相关
CPU Family Rec. system gcc Rec. ports compiler
Intel Atom D525 atom CPUTYPE=core2 (*) gcc45 -march=atom
Intel Xeon 3065 core2 CPUTYPE=core2 (*) gcc45
Intel Xeon E5310 core2 CPUTYPE=core2 (*) gcc45 -march=core2
Intel Xeon E5405 core2 no CPUTYPE gcc45 -march=core2
Intel Core i7-920 nehalem CPUTYPE=nocona gcc45 -march=nocona
Intel Xeon X3450 nehalem CPUTYPE=nocona gcc45 -march=nocona
Intel Xeon E5620 nehalem CPUTYPE=nocona gcc45 -march=nocona
AMD Opteron 6128 barcelona CPUTYPE=opteron-ssse3 gcc45 -march=barcelona
http://blog.vx.sk/archives/25-FreeBSD-Compiler-Benchmark-gcc-base-vs-gcc-ports-vs-clang.html