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x86 assembly language is the name for the family of assembly languages which provide some level of backward compatibility with CPUs back to the Intel 8008 microprocessor, which was launched in April 1972. [ 1][ 2] It is used to produce object code for the x86 class of processors. Regarded as a programming language, assembly is machine-specific ...
Cryptographic (e.g. RDRAND, AES-NI) Discontinued (e.g. 3DNow!, MPX, XOP) v. t. e. The x86 instruction set refers to the set of instructions that x86 -compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor.
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]
AMD Athlon (early version), a technically different but fully compatible x86 implementation. x86 (also known as 80x86[ 3] or the 8086 family[ 4]) is a family of complex instruction set computer (CISC) instruction set architectures [ a] initially developed by Intel based on the 8086 microprocessor and its 8-bit-external-bus variant, the 8088.
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). As is customary with machine binary ...
TEST (x86 instruction) In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF, ZF, PF are modified while the 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 ...
Assembly language provides a direct mapping between the numerical machine code and a human-readable version where numerical opcodes and operands are replaced by readable strings (e.g. 0x90 as the NOP instruction on x86, with 0xB8 being the MOV instruction, 0xE8 meaning CALL or 0x0F05 standing for the SYSCALL instruction).
In other words, user-written assembly language routines must be updated to save/restore XMM6 and XMM7 before/after the function when being ported from x86 to x86-64. Starting with Visual Studio 2013, Microsoft introduced the __vectorcall calling convention which extends the x64 convention.