https://sourceware.org/bugzilla/show_bug.cgi?id=32813
--- Comment #8 from Andreas Abel <abel at cs dot uni-saarland.de> --- I do not need to support other assemblers; this was just to show how that the current version of gas is the outlier here. And I would not need workarounds for the other assemblers, as they encode the instruction in the expected way. Note that besides the issue with the REX prefix, my original message also described another issue (32-bit source register) that hasn't been addressed yet. -- You are receiving this mail because: You are on the CC list for the bug.