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In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF, ZF, PF are modified while the numerical result of the AND is discarded. The OF and CF flags are set to 0, while AF flag is undefined. There are 9 different opcodes for the TEST instruction depending on the type and size of the operands. It ...
In computer programming, assembly language (alternatively assembler language [1] or symbolic machine code), [2] [3] [4] often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's machine code instructions. [5]
x86 assembly language has two primary syntax branches: Intel syntax and AT&T syntax. [6] Intel syntax is dominant in the DOS and Windows environments, while AT&T syntax is dominant in Unix-like systems, as Unix was originally developed at AT&T Bell Labs. [7] Below is a summary of the main differences between Intel syntax and AT&T syntax:
Fortran Assembly Program (FAP) Free IBM 709, 704x, 709x: Fortran Monitor System, IBSYS: GCOS Macro Assembly Program (GMAP) Free GE-600 series, Honeywell 6000 series: GCOS: Macro Assembly Program (MAP) Free IBM 709, 704x, 709x: IBSYS/IBJOB on 709, 704x, 709x Symbolic Assembly Program (SAP) Free IBM 704: IBM 704: IBM Basic Assembly Language (BAL ...
INT is an assembly language instruction for x86 processors that generates a software interrupt. It takes the interrupt number formatted as a byte value. [1] When written in assembly language, the instruction is written like this: INT X. where X is the software interrupt that should be generated (0-255).
The first of these, the Basic Assembly Language (BAL), is an extremely restricted assembly language, introduced in 1964 and used on 360 systems with only 8 KB of main memory, and only a card reader, a card punch, and a printer for input/output, as part of IBM Basic Programming Support (BPS/360).
The prologue and epilogue are not a part of the assembly language itself; they represent a convention used by assembly language programmers, and compilers of many higher-level languages. They are fairly rigid, having the same form in each function. Function prologue and epilogue also sometimes contain code for buffer overflow protection.
Bit Test and Reset. [a] [b] Second operand specifies which bit of the first operand to test and clear. BTR r/m, imm8: 0F BA /6 ib: BTC r/m, r: 0F BB /r: Bit Test and Complement. [a] [b] Second operand specifies which bit of the first operand to test and toggle. BTC r/m, imm8: 0F BA /7 ib: BSF r, r/m: NFx 0F BC /r [c] Bit scan forward. Returns ...