gcc - How is -march different from -mtune? - Stack Overflow
Oct 12, 2024 · -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 …
What are my available march/mtune options? - Stack Overflow
Nov 5, 2018 · Is there a way to get gcc to output the available -march=arch options? I'm getting build errors (tried -march=x86_64) and I don't know what my options are. The compiler I'm using is a …
Why is -march=native not enabled by default by compilers/IDEs?
Oct 5, 2018 · 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 …
How to see which flags -march=native will activate?
Mar 29, 2011 · 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 …
-march=haswell vs -march=core-avx2 vs -mavx2 - Stack Overflow
Jul 27, 2022 · 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 …
Why does march=native not work on Apple M1? - Stack Overflow
Jan 30, 2021 · When you say it used to work on an older MacBook, was it the same version of Clang? What does clang --version say on the two systems?
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 …
"clang compiler does not support -march=armv8.2-a+i8mm" during ...
Aug 29, 2023 · Internet search for "-march=armv8.2-a+i8mm" turns up nearly nothing helpful. Either build_aar.sh is asking for an arch that doesn't make sense, or I need to plug in a version of clang that …
How to verify at runtime that architecture matches -march=?
Sep 18, 2020 · We compile our code with g++ -march=ivybridge -mtune=skylake. In case somebody runs on older/incompatible architecture I want app to inform and exit gracefully. How do I do this? …
GCC: mtune vs march vs mcpu - Stack Overflow
Oct 15, 2023 · Now the tricky thing is I'm also reading that -mcpu is deprecated and its functionality is taken over by -mtune, which conflicts with my previous comments regarding the use of -mtune being …