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A comment on Arm AArch64 Adds Memcpy() Instructions. Parent comment
https://www.realworldtech.com/forum/?threadid=196054&curpost...
It seems to me that rep move is so bad that you want to avoid it, but trying to write a fast generic memcpy results in so much bloat to handle edge cases that rep move remains competitive in the generic case.
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https://www.realworldtech.com/forum/?threadid=196054&curpost...
https://www.realworldtech.com/forum/?threadid=196054&curpost...
It seems to me that rep move is so bad that you want to avoid it, but trying to write a fast generic memcpy results in so much bloat to handle edge cases that rep move remains competitive in the generic case.