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X86 SIMD Instruction Listings
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. Summary of SIMD extensions The main SIMD instruction set extensions that have been introduced for x86 are: MMX instructions and extended variants thereof These instructions are, unless otherwise noted, available in the following forms: * MMX: 64-bit vectors, operating on mm0..mm7 registers (aliased on top of the old x87 register file) * SSE2: 128-bit vectors, operating on xmm0..xmm15 registers (xmm0..xmm7 in 32-bit mode) * AVX: 128-bit vectors, operating on xmm0..xmm15 registers, with a new three-operand encoding enabled by the new VEX prefix. (AVX introduced 256-bit vector regi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Instruction Set
In computer science, an instruction set architecture (ISA) is an abstract model that generally defines how software controls the CPU in a computer or a family of computers. A device or program that executes instructions described by that ISA, such as a central processing unit (CPU), is called an ''implementation'' of that ISA. In general, an ISA defines the supported Machine code, instructions, data types, Register (computer), registers, the hardware support for managing Computer memory, main memory, fundamental features (such as the memory consistency, addressing modes, virtual memory), and the input/output model of implementations of the ISA. An ISA specifies the behavior of machine code running on implementations of that ISA in a fashion that does not depend on the characteristics of that implementation, providing binary compatibility between implementations. This enables multiple implementations of an ISA that differ in characteristics such as Computer performance, performa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
