https://sourceware.org/bugzilla/show_bug.cgi?id=20641

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
dcbf needs to keep its L field optional.  dcbf is used in the kernel and in
glibc without L.  Also tlbie and tlbiel ought to be optional, I think, because
earlier versions of these insns lacked the L field.

tbegin. is used in the kernel tools/testing/selftests/tm/ files without the R
field, and similarly in the gas testsuite.  I'm unsure about making that one
compulsory.  It seems reasonable to allow omission of the "Roll-back only"
modifier..

So..  cmp[l][o] get an optional L field only when generating 32-bit code. 
dcbf, tlbie and tlbiel keep their optional L field, ditto for R field of
tbegin.  cmprb, tsr., wlcr[all] and mtsle all change to a compulsory L field.

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