Hi all, I try to do movq 0x5555555555555555, %es:(%edx) move quadword to a memory location but gcc complains error suffix or operand invalid. what's wrong? thanks -- View this message in context: http://www.nabble.com/movq-instruction-not-supported--tf2200246.html#a6091470 Sent from the gcc - Help forum at Nabble.com.