https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207422
Bug ID: 207422
Summary: sys/amd64/amd64/support.S mempcy does not return dest
Product: Base System
Version: 11.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
I've checked the i386 and arm paths, and they appear to return dest in memcpy.
This is consistent with libc version of memcpy. For some reason, the amd64
version does not. Shouldn't we do something like:
ENTRY(memcpy)
PUSH_FRAME_POINTER
movq %rdi,%rax /* return dst pointer */
movq %rdx,%rcx
shrq $3,%rcx /* copy by 64-bit words */
cld /* copy forwards */
rep
movsq
movq %rdx,%rcx
andq $7,%rcx /* any bytes left? */
rep
movsb
POP_FRAME_POINTER
ret
END(memcpy)
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