11.01.2020, 10:02, "Shawn Landden" <shawn@xxxxxxx>: > --- > man3/memcmp.3 | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/man3/memcmp.3 b/man3/memcmp.3 > index 247eed223..6afca5ea4 100644 > --- a/man3/memcmp.3 > +++ b/man3/memcmp.3 > @@ -84,10 +84,17 @@ because the required CPU time depends on the number of equal bytes. > Instead, a function that performs comparisons in constant time is required. > Some operating systems provide such a function (e.g., NetBSD's > .BR consttime_memequal ()), > but no such function is specified in POSIX. > On Linux, it may be necessary to implement such a function oneself. > +.PP > +LLVM 9, released in 2019, and later will optimize a call to > +.BR memcmp () > +to a call to > +.BR bcmp (3) > +if the return value is only checked for equilivence to zero. > +.\" http://releases.llvm.org/9.0.0/docs/ReleaseNotes.html#noteworthy-optimizations > .SH SEE ALSO > .BR bcmp (3), > .BR bstring (3), > .BR strcasecmp (3), > .BR strcmp (3), > -- > 2.20.1 -- Shawn Landden
