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 …
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 …
Specify `--march` in a Spring Boot Native Build - Stack Overflow
Aug 16, 2025 · -march: generate instructions for a specific machine type. Defaults to x86-64-v3 on AMD64 and armv8-a on AArch64. Use -march=compatibility for best compatibility, or -march=native …
-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 gcc -march=znver1 restrict uint64_t vectorization?
Apr 9, 2022 · I'm trying to make sure gcc vectorizes my loops. It turns out, that by using -march=znver1 (or -march=native) gcc skips some loops even though they can be vectorized. Why does this …
How to know all supported values for clang -march argument?
Mar 11, 2025 · 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 …
riscv cross compiler error: invalid -march= option: `rv64imafdc_zicsr'
Sep 25, 2024 · 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 …
how to change '-march=native' compile flag added by PCL in cmake
Nov 24, 2023 · "I want change it to -march=x86-64 in cmake, How to do it? - Find out how exactly PCL adds -march=native flag. If it does that via variable CMAKE_CXX_FLAGS, then you may try to …
c++ - g++: optimization -march=haswell and newer changes …
Jul 27, 2017 · g++: optimization -march=haswell and newer changes numerical result Asked 8 years, 8 months ago Modified 8 years, 8 months ago Viewed 3k times
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 …