--- 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 +.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
