"noalias" in library function declarations

[Roland McGrath]

I gather that now all the library functions with pointer
arguments are declared like:
	void memcpy(noalias void *s1, noalias const void *s2);
Is that correct?

Now, I don't understand noalias very well, but I think
	void memcpy(noalias void *noalias s1, noalias const void *noalias s2);
would mean something.  What does it mean?
-- 
		Roland McGrath
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