Understanding march for our lives highlights students protesting guns say enough is requires examining multiple perspectives and considerations. Why is -march=native not enabled by default by compilers/IDEs?. Why no march=native by default? As you have pointed out, besides producing binaries incompatibility with older CPUs, march=native isn't necessarily beneficial. Moreover, it improves performance in some cases such as numerical computing. Equally important, but it is not beneficial in many other cases, and is sometimes detrimental. Similarly, gcc - How is -march different from -mtune?
-march=foo implies -mtune=foo unless you also specify a different -mtune. This is one reason why using -march is better than just enabling options like -mavx without doing anything about tuning. c++ - What exactly does -march=native do? Gentoo Wiki told me the following: 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 reaso...
Building on this, -march=haswell vs -march=core-avx2 vs -mavx2 - Stack Overflow. What are the differences and tradeoffs between -march=haswell, -march=core-avx2, and -mavx2 for compiling avx2 intrinsics? I know that -mavx2 is a flag and -march=haswell/core-avx2 are architectures which just translate to a bunch of flags. It's important to note that, so -mavx2 is a subset of the other two.
Additionally, but beyond that, how do I choose the right one for my application? How to see which flags -march=native will activate?. I'm compiling my C++ app using GCC 4.3. Instead of manually selecting the optimization flags I'm using -march=native, which in theory should add all optimization flags applicable to the hardware I'm
gcc: Differences between -march=native and -march=<specific arch>. As I understand it, -march=native will detect the ISA and extensions to use from cpuid (which include model, family and stepping information). -march=xxx will use a baseline set of extensions and a baseline ISA. There are a lot of possible combinations of extensions, so only the most relevant were chosen (e.g.
skylake-avx512 was added to reflect an important extension of some skylakes). c++ - equivalent of -march=native for msvc - Stack Overflow. As far as I know, the compilation option for MSVC that tells the compiler to use special available instruction is /arch. On clang/linux, we can use -march=native to automatically detect the archite...
What are my available march/mtune options? Is there a way to get gcc to output the available -march=arch options?
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