问题描述
对于GCC CFLAGS选项:-msse，-msse2，-mssse3，-msse4，-msse4.1，-msse4.2.它们是专有用途还是可以一起使用?
For the GCC CFLAGS options: -msse, -msse2, -mssse3, -msse4, -msse4.1, -msse4.2. Are they exclusive in their use or can they be used together?
我的理解是，要设置的选择取决于运行程序的目标拱门是否支持它-这是正确的吗?
My understanding is that the choosing which to set depends on whether the target arch, which the program will run on, supports it or not - is this correct?
如果是这样，我怎么知道目标弓所支持的功能?在Linux中，我使用/proc/cpuinfo，但如果使用Mac或Windows，该怎么办?
If so, how could I know what sse my target arch supports? In Linux, I cat /proc/cpuinfo, but what if Mac or Windows?
谢谢！
推荐答案
-m开关可以并行使用，此外，某些架构或其他开关也暗含了它们.例如，如果您为x86_64构建代码，则始终启用-msse -msse2.
The -m switched can be used in parallel, furthermore some of them are implied by the architecture or other switches. For instance, if you build code for x86_64, -msse -msse2 is always enabled.
对于要在系统上运行的代码，您应该选择-march=native，这将选择处理器上可用的代码.例如，如果您有Sandy Bridge，这将启用-msse -msse2 -msse3 -mssse3 -msse4 -msse4.1 -msse4.2 -mavx.
For code intended to run on your system you should choose -march=native, which will select what is available on your processor. For instance, if you have a Sandy Bridge, this will enable -msse -msse2 -msse3 -mssse3 -msse4 -msse4.1 -msse4.2 -mavx.
如果要详细指定要使用的指令集，则应仅使用可用的指令集，而不总是使用最新"指令集.目前，最新"处理器是-mavx2，我不建议这样做:支持该处理器的第一个处理器将于2013年推出.
If you want to specify in detail which instruction set to use, you should only use what is available, not always the "latest". The "latest" one is currently -mavx2, which I don't recommend: The first processor which will support it will be available in 2013.
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