glibc/sysdeps/x86_64/multiarch/bcopy.S

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#include <sysdep.h>

	.text
ENTRY(bcopy)
	xchg	%rdi, %rsi
	jmp	HIDDEN_BUILTIN_JUMPTARGET(memmove)
END(bcopy)
Improve 64bit memcpy/memmove for Atom, Core 2 and Core i7 This patch includes optimized 64bit memcpy/memmove for Atom, Core 2 and Core i7. It improves memcpy by up to 3X on Atom, up to 4X on Core 2 and up to 1X on Core i7. It also improves memmove by up to 3X on Atom, up to 4X on Core 2 and up to 2X on Core i7. 2010-06-30 15:26:11 +00:00			`#include <sysdep.h>`

			`.text`
			`ENTRY(bcopy)`
			`xchg %rdi, %rsi`
			`jmp HIDDEN_BUILTIN_JUMPTARGET(memmove)`
			`END(bcopy)`