Gentoo Wiki told me the following:
Gentoo Wiki告诉我以下内容：
Warning: GCC 4.2 and above support -march=native. -march=native applies additional settings beyond -march, specific to your CPU. Unless you have a specific reason not to (e.g. distcc cross-compiling), you should probably be using -march=native, rather than anything listed below.
警告：GCC 4.2及以上版本支持-march = native。 -march = native应用超出-march的其他设置，特定于CPU。除非您有特殊原因（例如，distcc交叉编译），否则您应该使用-march = native，而不是下面列出的任何内容。
What are those additional settings?
那些额外的设置是什么？
1 个解决方案
#1
12
Nevermind.
没关系。
$ cc -march=core2 -E -v - </dev/null 2>&1 | grep cc1
/[...]/cc1 -E -quiet -v -iprefix /[...]/4.3.2/ - -march=core2
$ cc -march=native -E -v - </dev/null 2>&1 | grep cc1
/[...]/cc1 -E -quiet -v -iprefix /[...]/4.3.2/ - -march=core2 -mcx16 -msahf --param l1-cache-size=32 --param l1-cache-line-size=64 -mtune=core2
I'm starting to like this option a lot. -mcx16 and -msahf are two additional CPU instructions gcc can now use, which weren't available in earlier Core2's.
我开始喜欢这个选项了很多。 -mcx16和-msahf是gcc现在可以使用的另外两个CPU指令，这些指令在早期的Core2中不可用。
#1
12
Nevermind.
没关系。
$ cc -march=core2 -E -v - </dev/null 2>&1 | grep cc1
/[...]/cc1 -E -quiet -v -iprefix /[...]/4.3.2/ - -march=core2
$ cc -march=native -E -v - </dev/null 2>&1 | grep cc1
/[...]/cc1 -E -quiet -v -iprefix /[...]/4.3.2/ - -march=core2 -mcx16 -msahf --param l1-cache-size=32 --param l1-cache-line-size=64 -mtune=core2
I'm starting to like this option a lot. -mcx16 and -msahf are two additional CPU instructions gcc can now use, which weren't available in earlier Core2's.
我开始喜欢这个选项了很多。 -mcx16和-msahf是gcc现在可以使用的另外两个CPU指令，这些指令在早期的Core2中不可用。