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7c: don't emit SXTW for non-register source operand

--- a/sys/src/cmd/7c/txt.c

+++ b/sys/src/cmd/7c/txt.c

@@ -764,7 +764,7 @@

 			if(typeu[ft])

 				a = AMOVWU;

 			else

-				a = ASXTW;

+				a = (f->op == OREGISTER) ? ASXTW : AMOVW;

 			break;

 		}

 		break;