X86 assembly instructions

How does the assembly TEST instruction work with these jump instructions? September 1, 2025

TESTL with identical arguments (like edx and edx) sets the flags based on the value of that argument itself (since x AND x is identical to x). So we can forget about the AND altogether here since it's discarded - all we need to concern ourselves with is the value in edx.

With TESTL, the zero flag ZF is set to 1 only if the value is zero. TESTL also forces the overflow flag OF to 0 and sets the sign flag SF only if the high bit is set.

JLE will then jump if either ZF is set to 1, or SF OF.

So, the jump will execute if either:

edx was zero; or
edx had its high bit set.

Hence it will jump for edx values of 0 or 0x80000000 - 0xffffffff.

Source: stackoverflow.com

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X86 assembly instructions

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