Programming Forums - View Single Post - [x86]Instruction test setting the zero flag

Klarre · Aug 11th, 2007, 6:34 AM

Was currently stepping through an application and found a piece of code that I could not understand.

My question is:
How can a TEST instruction set the ZERO flag when testing a byte with the same byte?

(Toggle Plain Text)

...
TEST, CL, CL
JE SHORT Application.004013B4 ; When will this row be executed?
...

Thanks for your help!

/Klarre

Aug 11th, 2007, 6:34 AM	#1
Klarre Game engine designer Join Date: May 2005 Location: Sweden Posts: 291 Rep Power: 4	[x86]Instruction test setting the zero flag Was currently stepping through an application and found a piece of code that I could not understand. My question is: How can a TEST instruction set the ZERO flag when testing a byte with the same byte? (Toggle Plain Text) ... TEST, CL, CL JE SHORT Application.004013B4 ; When will this row be executed? ... ... TEST, CL, CL JE SHORT Application.004013B4 ; When will this row be executed? ... Thanks for your help! /Klarre __________________ http://www.klarre.se