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. -- You are receiving this mail because: You are on the CC list for the bug.