https://sourceware.org/bugzilla/show_bug.cgi?id=32813
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andreas Abel from comment #5)
> If it is not a bug, but a conscious choice to prefer the form without the
> REX prefix to optimize the instruction size, I would expect that
> `{nooptimize} LSL RCX, RDX` has the prefix, but this is not the case either.
Since there is a workaround, I don't know if the assembler will be changed.
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