just disassembled some code generated by 6c
and found something funny. the debugger seems
to print the operands of MOVLQSX in the wrong
order.

output of 6c -S:

	MOVLQSX	BP,CX
	ADDQ	CX,AX
	RET	,

output of acid:

foo+0x1a 0x00200042	MOVLQSX	CX,BP
foo+0x1d 0x00200045	ADDQ	CX,AX
foo+0x20 0x00200048	RET

Reference: /n/atom/patch/applied/movlqsxdb
Date: Fri Jan 17 21:33:35 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libmach/8db.c	Fri Jan 17 21:33:22 2014
+++ /sys/src/libmach/8db.c	Fri Jan 17 21:33:23 2014
@@ -1233,7 +1233,7 @@
 [0xfd]	0,0,		"STD",
 [0xfe]	RMOPB,0,	optabFE,
 [0xff]	RMOP,0,		optabFF,
-[0x100]	RM,0,		"MOVLQSX	%r,%e",
+[0x100]	RM,0,		"MOVLQSX	%e,%r",
 };
 
 /*