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A comment on no strpy either. Parent comment
Not even musl uses a scalar loop, if it can do aligned reads/writes: https://git.musl-libc.org/cgit/musl/tree/src/string/stpcpy.c
And you don't need to worry about C UB if you do it in ASM.
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Not even musl uses a scalar loop, if it can do aligned reads/writes: https://git.musl-libc.org/cgit/musl/tree/src/string/stpcpy.c
And you don't need to worry about C UB if you do it in ASM.