Ormlis's blog

No avx2 in C++ 20
By Ormlis, history, 8 months ago, In English

I don't know much about compilers. So I'm interested in hearing from those in the know. Why is avx2 no longer available in the new C++20 compiler on Codeforces?

https://mirror.codeforces.com/contest/4/submission/252556092

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8 months ago, # |
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There has been some post about this (forgot link); basically you need to do the #pragma GCC targets after you include STL headers. The headers don't work nicely with AVX.

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8 months ago, # |
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It's a bug introduced in gcc 13. Bugzilla post

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