Reverse Engineering for Beginners

CHAPTER 17. FLOATING-POINT UNIT CHAPTER 17. FLOATING-POINT UNIT

FSTP ST(orFSTP ST(0)) was executed —1.2 was popped from the stack, and 3.4 was left on top:

Figure 17.20:OllyDbg:FSTPis executed

We see that theFSTP ST instruction works just like popping one value from the FPU stack.