求助。。关于MIPS的代码

沙漠上的妖精

SLLV -- Shift left logical variable

Description:	Shifts a register value left by the value in a second register and places the result in a third register. Zeroes are shifted in.
Operation:	$d = $t << $s; advance_pc (4);
Syntax:	sllv $d, $t, $s
Encoding:	0000 00ss ssst tttt dddd d--- --00 0100

为什么会有一段“--- --”在里面？如果编译出来后，对应的16进制代码是怎样的？

jcchan

thanks!!!!!

lhtlht888

good.............