问题描述
有没有推到堆栈从XMM寄存器一个压缩双整数的方法吗?然后在需要时以后弹出回来?
完美的我正在寻找像PUSH或POP的通用寄存器,我已经检查了英特尔的手册,但我要么错过了命令或没有一个...
或将我必须解压值通用寄存器,然后把他们?
在此先感谢!
根据GJ的答案是这样的解决方案:
子EBP,16
MOVDQU xmmword PTR [EBP],xmm6
MOVDQU XMM4,xmmword PTR [EBP]
没有,有没有这样的下一个x86的指令汇编,但你可以这样做:
//推XMM0
子尤,16
MOVDQU dqword [ESP],XMM0//流行XMM0
MOVDQU XMM0,dqword [ESP]
ADD ESP,16
编辑:
上code样品是直接推/流行仿真。
在您正在使用的堆栈还有其他的局部变量,比 EBP
寄存器必须在第一次的情况下正确设置,如:
推EBP
MOV EBP,ESP
子ESP,LocaStackVariablesSize
// ...您code
MOV ESP,EBP
流行EBP
RET
在这种情况下,你也可以用丹尼尔斯的解决方案!
Is there a way of pushing a packed doubleword integer from XMM register to the stack? and then later on pop it back when needed?
Perfectly I am looking for something like PUSH or POP for general purpose registers, I have checked Intel manuals but I either missed the command or there isn't one...
Or will I have to unpack values to general registers and then push them?
Thanks in advance!
Based on GJ answer that was the solution:
sub ebp, 16
movdqu xmmword ptr [ebp], xmm6
movdqu xmm4, xmmword ptr[ebp]
No, there is no such a asm instruction under x86, but you can do something like:
//Push xmm0
sub esp, 16
movdqu dqword [esp], xmm0
//Pop xmm0
movdqu xmm0, dqword [esp]
add esp, 16
EDIT:
Upper code sample is direct push/pop emulation.
In case that you are using on stack also other local variables, than the ebp
register must be at first properly set, like:
push ebp
mov ebp, esp
sub esp, LocaStackVariablesSize
//... your code
mov esp, ebp
pop ebp
ret
In that case you can also use Daniels solution!
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