Why is memcpy() slow sometimes? Whats up GCC and clang? (Patreon)

Troubleshooting a slow memory copy (thanks GCC!) #Level1Diagnostics

How we approached a performance problem in Looking Glass -- why is memcpy slow? Let's figure it out. But I'm a lazy dev and the compiler should do all the work for me so I don't have to think about it. Most of the time that works great except when it doesn't. Want to compile and follow along at home? git clone this: https://github.com/level1wendell/memcpy_sse ********************************** Thanks for watching our videos! If you want more, check us out online at the following places: + Website: http://level1techs.com/ + Forums: http://forum.level1techs.com/ + Store: http://store.level1techs.com/ + Patreon: https://www.patreon.com/level1 + L1 Twitter: https://twitter.com/level1techs + L1 Facebook: https://www.facebook.com/level1techs + Wendell Twitter: https://twitter.com/tekwendell + Ryan Twitter: https://twitter.com/pgpryan + Krista Twitter: https://twitter.com/kreestuh + Business Inquiries/Brand Integrations: Queries@level1techs.com *IMPORTANT* Any email lacking “level1techs.com” should be ignored and immediately reported to Queries@level1techs.com. ----------------------------------------------------------------------------------------------------------- Intro and Outro Music By: Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/