overflow - 整数溢出 IA 32

Question

在 ia-32 中溢出是如何工作的？

例如，下面的代码会发生什么？它会抛出什么旗帜？

movl $0x1, %eax
addl $7fffffff, %eax

谢谢！

Answer 1

If memory serves, addition sets the overflow flag is set when the sign bit changes without the carry bit being set. 1 + 0x7FFFFFFF would set overflow, clear carry, and clear zero.