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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 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.
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.
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
Opcodes in x86 are generally one-byte, though two-byte instructions and prefixes exist. ModR/M is a byte that, if required, follows the opcode and specifies zero, one, or two operands for the instruction.
Instruction set extensions that have been added to the x86 instruction set in order to support hardware virtualization.These extensions provide instructions for entering and leaving a virtualized execution context and for loading virtual-machine control structures (VMCSs), which hold the state of the guest and host, along with fields which control processor behavior within the virtual machine.
This is a list of the instructions in the instruction set of the Common Intermediate Language bytecode. Opcode abbreviated from operation code is the portion of a machine language instruction that specifies the operation to be performed. Base instructions form a Turing-complete instruction set.