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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. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new ...
The first generation Xeon Phi processors, codenamed "Knights Corner" (KNC), supported a large number of instructions that are not seen in any later x86 processor. An instruction reference is available [5] − the instructions/opcodes unique to KNC are the ones with VEX and MVEX prefixes (except for the KMOV, KNOT and KORTEST instructions − ...
The Intel BCD opcodes are a set of six x86 instructions that operate with binary-coded decimal numbers. The radix used for the representation of numbers in the x86 processors is 2. This is called a binary numeral system. However, the x86 processors do have limited support for the decimal numeral system.
Some instruction sets have nearly uniform fields for opcode and operand specifiers, whereas others (e.g., x86 architecture) have a less uniform, variable-length structure. [10] [11] Instruction sets can be extended through the use of opcode prefixes which add a subset of new instructions made up of existing opcodes following reserved byte ...
The x86 instruction set has several times been extended with SIMD (Single instruction, multiple data) instruction set extensions.These extensions, starting from the MMX instruction set extension introduced with Pentium MMX in 1997, typically define sets of wide registers and instructions that subdivide these registers into fixed-size lanes and perform a computation for each lane in parallel.
Instruction Opcode Description PCLMULQDQ xmm1,xmm2,imm8: 66 0F 3A 44 /r ib: Perform a carry-less multiplication of two 64-bit polynomials over the finite field GF(2 k). PCLMULLQLQDQ xmm1,xmm2/m128: 66 0F 3A 44 /r 00: Multiply the low halves of the two 128-bit operands. PCLMULHQLQDQ xmm1,xmm2/m128: 66 0F 3A 44 /r 01
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 operands. It can compare ...
In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU Identification) allowing software to discover details of the processor.