September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Flag control instructions
The EFlags register contains information on certain aspects of the last ALU operation as well as certain settings of the CPU (for example, the direction of string instructions); however, we have the mechanism for controlling the content of this register, up to the level of a single flag, with the following instructions:
- Set/clear carry flag (STC/CLC): We may want to have the CF set or reset prior to certain operations.
- Complement the carry flag (CMC): This instruction inverts the value of the CF.
- Set/clear direction flag (STD/CLD): We may use these instructions to set or reset the DF in order to define whether ESI/EDI (RSI/RDI) should increment or decrement with string instructions.
- Load flags into the AH register ...
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