计算AT＆amp; T组件中的指数

Question

我如何在AT＆amp; T程序集中进行指数操作，例如x ^ y，x = 3，y = 10？

假设r14的值为3. r15的值为10.其中r14 = x，r15 = y。

我可以这样做来计算x ^ y的指数吗？如果不是如何计算AT＆amp; T组件中的指数？

.globl functionWithItems

functionWithItems:
     //Do some stuff that I want here.
     //I need to x ^ y
     jmp .power
.power:
    imulq %r14, %r14
    dec %r15        
    cmpq $-1, %r15
    jne .power
    jmp .continueOtherPartsOfProgram

.continueOtherPartsOfProgram:
    //Do some stuff after doing the power. r14 should now contain x ^ y.
    ret

修改代码后：

.globl functionWithItems

functionWithItems:
     //Do some stuff that I want here.
     //I need to x ^ y
     cmpq $0, %r15
     je .zeroValue
     movq %r14, %rbx 
     cmpq $2, %r15
     jge .numberTimes
     jmp .continueOtherPartsOfProgram

.zeroValue:
     movq $1, %rbx
     jmp .continueOtherPartsOfProgram

.numberTimes:
     dec %r15 
     jmp .power

.power:
    imulq %r14, %rbx
    dec %r15        
    cmpq $0, %r15
    jne .power
    jmp .continueOtherPartsOfProgram

.continueOtherPartsOfProgram:
    //Do some stuff after doing the power. r14 should now contain x ^ y.
    ret