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That's clever, but for usage in glibc or the like the clunky versionAll of these compile to the MM instruction in My 66000,
is the preferred one: memmove() is usually called through the dynamic
linking mechanism, and which implementation is actually called is
selected based on the hardware that it runs on (what does it do when
the program is linked statically?). There seem to be quite a few
memmove() (and __memmove_chk()) implementations in glibc-2.36 on
AMD64:
>
__memmove_chk
__memmove_sse2_unaligned_erms
__memmove_chk
__memmove_chk_erms
__memmove_chk_evex_unaligned
__memmove_chk_avx_unaligned
__memmove_chk_ssse3
__memmove_chk_sse2_unaligned
__memmove_erms
__memmove_avx512_unaligned
__memmove_evex_unaligned
__memmove_evex_unaligned_erms
__memmove_avx_unaligned
__memmove_avx_unaligned_erms
__memmove_avx_unaligned_rtm
__memmove_ssse3
__memmove_sse2_unaligned
__memmove_chk_sse2_unaligned_erms
__memmove_chk_avx512_no_vzeroupper
__memmove_chk_avx512_unaligned
__memmove_chk_avx512_unaligned_erms
__memmove_chk_evex_unaligned_erms
__memmove_chk_avx_unaligned_erms
__memmove_chk_avx_unaligned_rtm
__memmove_chk_avx_unaligned_erms_rtm
__memmove_avx512_no_vzeroupper
__memmove_avx512_unaligned_erms
__memmove_avx_unaligned_erms_rtm
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