Hi, how do I constraint the rtx to generate movsi Insn that only use odd 16bits register number (R1, R3, R5 ..) ? for register pairing (e.g R1 and R2 is a pair, R3 and R4 ...) . -- View this message in context: http://gcc.1065356.n5.nabble.com/question-about-gcc-rtx-tp1200050.html Sent from the gcc - Help mailing list archive at Nabble.com.