Rather than having special-case swap functions for 4- and 8-byte objects,
special-case aligned multiples of 4 or 8 bytes. This speeds up most
users of sort() by avoiding fallback to the byte copy loop.
Despite what commit ca96ab859ab4 ("lib/sort: Add 64 bit swap function")
claims, very few users
Rather than having special-case swap functions for 4- and 8-byte objects,
special-case aligned multiples of 4 or 8 bytes. This speeds up most
users of sort() by avoiding fallback to the byte copy loop.
Despite what commit ca96ab859ab4 ("lib/sort: Add 64 bit swap function")
claims, very few users
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