ARM汇编 smull指令 不太理解 有人知道吗
淩度ツ 2018-04-21 04:56:21 0x10065ee48 <+4256>: smull x8, w0, w27
(lldb) p/x $w0
(unsigned int) $3 = 0x14ced9f9
(lldb) p/x $w27
(unsigned int) $4 = 0x80010003
(lldb) p/x $x0*$x27 //自己测试
(unsigned long) $5 = 0x0a6781cb98658deb
执行后结果
(lldb) p/x $x8
(unsigned long) $6 = 0xf598a7d298658deb
有人知道smull这个指令的含义吗,为什么结果不是0x0a6781cb98658deb而是0xf598a7d298658deb