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b8 13 29 MOV AX ,0x2913
50 PUSH AX
b8 00 00 MOV AX ,0x0
50 PUSH AX

POP QUIX: The usual way to zero out a register on x86 is XOR AX,AX. This'd be only 2 bytes (31 C0). The compiler knows this. Why didn't it use XOR AX, AX here, instead of the bigger MOV AX, 0x0?

(It's not because optimizations were off!)