80x87 - meaning and definition. What is 80x87
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What (who) is 80x87 - definition

PART OF X86 INSTRUCTION SET ARCHITECTURE FOR FLOATING-POINT ARITHMETIC
Intel 80487; 80487; I487; Intel 80387; 80387 Microprocessor; Intel 80287; 80287; 80387; 80287 Microprocessor; 80x87; Intel 80x87; Intel 387; Intel 80187; 80187; Intel 80487SX; I387; I287; NPX; X87 FPU; Numeric processor extension; IAPX 187; IAPX 287
  • Intel 80387 CPU die image
  • i487SX

i487         
X87         
x87 is a floating-point-related subset of the x86 architecture instruction set. It originated as an extension of the 8086 instruction set in the form of optional floating-point coprocessors that worked in tandem with corresponding x86 CPUs.

Wikipedia

X87

x87 is a floating-point-related subset of the x86 architecture instruction set. It originated as an extension of the 8086 instruction set in the form of optional floating-point coprocessors that worked in tandem with corresponding x86 CPUs. These microchips had names ending in "87". This was also known as the NPX (Numeric Processor eXtension). Like other extensions to the basic instruction set, x87 instructions are not strictly needed to construct working programs, but provide hardware and microcode implementations of common numerical tasks, allowing these tasks to be performed much faster than corresponding machine code routines can. The x87 instruction set includes instructions for basic floating-point operations such as addition, subtraction and comparison, but also for more complex numerical operations, such as the computation of the tangent function and its inverse, for example.

Most x86 processors since the Intel 80486 have had these x87 instructions implemented in the main CPU, but the term is sometimes still used to refer to that part of the instruction set. Before x87 instructions were standard in PCs, compilers or programmers had to use rather slow library calls to perform floating-point operations, a method that is still common in (low-cost) embedded systems.