https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49244
--- Comment #25 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Jakub Jelinek from comment #24) > I wanted to look at #c20, but at least my i9-7960X for e.g. lock; btsl $65, > var > acts the same as lock; btsl $1, var rather than lock; btsl $1, var+8, > so maybe #c20 is not possible. The maximum bit position is 63 for the immediate operand.
