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Bookmark or Share- c++ - g++: optimization -march=haswell and newer changes numerical ...4. I have been working on optimizing performance and of course doing regression tests when I noticed that g++ seems to alter results depending on chosen optimization. So far I thought that -O2 -march= [whatever] should yield the exact same results for numerical computations regardless of what architecture is chosen.
- Implementation of March memory testing algorithmFill memory, wait a bit, read it back, see if some writes snuck in. You mentioned sram, for dram a slow test is important to make sure the refreshes are working, perhaps fill with unique patterns, wait a while, read back, fill with the inverse of the unique patterns to flip every bit, wait a while, read back. I have for the most part abandoned ...
- gcc - Why is -march=native used so rarely? - Stack OverflowWith most C/C++ compilers, there's a flag passable to the compiler, -march=native, which tells the compiler to tune generated code for the micro-architecture and ISA extensions of the host CPU. Even if it doesn't go by the same name, there's typically an equivalent option for LLVM-based compilers, like rustc or swiftc.
- How to see which flags -march=native will activate?There is resolve-march-native for exactly this: It parses GCC output and combines the output from multiple calls to GCC into the eventual answer. For example: # resolve-march-native --vertical -march=sandybridge -maes --param=l1-cache-line-size=64 --param=l1-cache-size=32 --param=l2-cache-size=3072 There is also distccflags but it seems ...
- Why does march=native not work on Apple M1? - Stack Overflow0. another solutions is update clang with brew. lang: error: the clang compiler does not support '-march=native'. 1° - Install llvm con brew. brew install llvm. 2° - Check clang version. cd /opt/homebrew/opt/llvm.
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