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gallier2
on Jan 18, 2021
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That XOR Trick (2020)
The XOR trick has also the disadvantage of being 3 dependend instructions that can not overlap. The one with a temp variable has only 2 of them dependend and can therefore save one cycle on an OO CPU.
mhh__
on Jan 19, 2021
[–]
Even in a old OOO core because of register renaming and friends the swap could have a latency of zero in the first place.
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