Introduction to assembly language test instructions
#The Test command performs a logical AND operation on the two operands and sets the relevant flag bits according to the operation result. However, the two operands of the Test command will not be changed. The operation result will be discarded after setting the relevant flag bit.
Test performs an AND logical operation on two parameters (target, source) and sets the flag register based on the result. The result itself is not saved.
TEST AX,BX and AND AX,BX commands have the same effect, except that the Test command does not change the contents of AX and BX, while the AND command saves the result to AX.
Syntax: TEST r/m,r/m/data
Affected flags: C,O,P,Z,S (the two flags C and O will be set to 0)
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