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if (foo)andif (foo != 0)should generate the same code, and secondly, you're showing that the assembly language you're using in fact has explicit boolean operands and tests for them. For instancejzmeansjump if zero. In other wordsif (a == 0) goto target;. And the quantity is not even being tested directly; the condition is converted its a boolean flag which is stored in a special machine word. It's actually more likecpu.flags.zero = (a == 0); if (cpu.flags.zero) goto target;jzinstruction but nojnz? (or any other asymmetric set of conditional instructions)