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- Why is -march=native not enabled by default by compilers IDEs?
For -O0, whether -march=native or -march=<generic> is the default still specifies the same family, so both are perfectly compatibly with -O0; and whenever another optimization level is specified, -march=native is beneficial to performance So, for me, the fact that -O0 is the default doesn't matter for -march 's default
- gcc: Differences between -march=native and -march= lt;specific arch gt;
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) -march
- gcc - How is -march different from -mtune? - Stack Overflow
-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 Caveat: -march=native on a CPU that GCC doesn't specifically recognize will still enable new instruction sets that GCC can detect, but will leave -mtune=generic Use a new enough GCC that knows about
- c++ - What exactly does -march=native do? - Stack Overflow
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
- 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
- How to know all supported values for clang -march argument?
Using Clang 16 0 or later, I would like to know what values could be used for the -march argument The command clang --print-supported-cpus shows for -mcpu=, but I see no alternative for -march
- -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 So -mavx2 is a subset of the other two But beyond that, how do I choose the right one for my application?
- riscv cross compiler error: invalid -march= option: `rv64imafdc_zicsr
GNU assembler version 2 38 (x86_64-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2 38 Assembler messages: Fatal error: invalid -march= option: `rv64imafdc_zicsr' Thanks for any response and help! Best regards Troy
- unrecognized command-line option -arch; did you mean -march=?
I've encountered a similar problem when cross-compiling a RISC-V project on my MacBook with macOS Sonoma I found that CMake will set -arch arm64 by default, and there is an option controlling the argument to -arch called CMAKE_OSX_ARCHITECTURES However, setting this argument to false does not help since CMake still applies a default value of arm64 which is the architecture of the build host
- 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
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