ios下一个4字节对齐引起崩溃的问题

staticvoid TEACore(unsignedint in[2], unsignedint out[2], unsignedint key[4], long rounds)

{

unsigned int y = in[0], z = in[1];

unsigned int limit = 0, sum = 0;

 

if(rounds > 0)// encrypt

{

limit = DELTA * rounds;

while(sum != limit)

{

y += ((z<<4)^(z>>5)) + (z^sum) + key[sum&3];

sum += DELTA;

z += ((y<<4)^(y>>5)) + (y^sum) + key[(sum>>11)&3];

}

}

else// decrypt

{

sum = DELTA * (-rounds);

while(sum)

{

z -= ((y<<4)^(y>>5)) + (y^sum) + key[(sum>>11)&3];

sum -= DELTA;

y -= ((z<<4)^(z>>5)) + (z^sum) + key[sum&3];

}

}

 

        //arm 内存4字节对齐

//out[0] = y; out[1] = z;

        memcpy((void*)&out[0], (void*)&y, sizeof(unsigned int));

        memcpy((void*)&out[1], (void*)&z, sizeof(unsigned int));

}

在进行强制数据类型转换的时候，ios平台竟然要求内存字节对齐。而debug环境又不要求。如果两次强制类型转换用oc的代码隔开，release执行又是正确的，所以再次怀疑是xocde在编译的时候，编译器优化导致的。

转载于:https://www.cnblogs.com/sealme/p/3774729.html