llvm dev - Sep 2015 - (implicit SR) v. Defs = [SR] ?

in a ".td" file
what is the difference between saying
                (implicit FLAGS)
in an instruction definition's pattern, verses saying
                Defs = [FLAGS];
in an instruction definition


one might conclude that since not all machines that have condition codes use
"implicit"
that "implicit" is redundant, is this true ?


TIA,
-Peter Lawrence.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20150925/12beea7a/attachment.html>