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On platforms thar require aligned loads and stores (not x86 nor ARM), a direct pointer cast sometimes uses an aligned load/store where a memcpy uses multiple by
by LegionMammal978 2y ago
On platforms thar require aligned loads and stores (not x86 nor ARM), a direct pointer cast sometimes uses an aligned load/store where a memcpy uses multiple byte loads/stores, even on a good compiler, since memcpy() doesn't require that the pointers are aligned. This can be mitigated by going through a local variable, but it gets pretty verbose.
- stouset 2y agoSounds like a good place for a macro?
- mbitsnbites 2y agoWe have memcpy behind a C++ template function that mimics the interface of std::bit_cast.
- ack_complete 2y agoSome ARM CPUs do require aligned loads and stores, such as the Cortex-M0+ in a Raspberry Pi Pico.