Java processor floating-point arithmetic unit and its control method

Abstract

The invention discloses a floating-point unit of a Java processor and a control method thereof, which meet the requirements of an embedded system on a high-accuracy operation, wherein the floating-point unit is used as a hardware accelerator and directly connected to the core of the Java processor, and an input port of the FPU (floating-point unit) is used for receiving a clock input, a starting signal, an operand A, an operand B, an operator and a rounding mode which are from the core of the Java processor. The FPU comprises operation units and a demultiplexer; the FPU selects the corresponding operation units according to the input operator, and the operation units realize various basic operations; the operation units are divided into an addition / subtraction operation unit, a multiplication operation unit and a division operation unit; and the demultiplexer selects a register of an operation result of the corresponding operation unit according to the input operator, and checks whether the operation and a to-be-output operation result trigger the abnormity of a floating point with a standard definition, if so, the demultiplexer outputs a corresponding abnormity signal; otherwise, an output port of the FPU sends a completion signal and the operation result in the register to the core of the Java processor.

Description

technical field [0001] The invention belongs to the technical field of embedded processor design, and specifically relates to a Java processor floating point that supports floating-point operations, can make floating-point operations more direct and efficient, and meets the requirements of embedded systems for high-precision operations A computing unit and a control method thereof. Background technique [0002] As the Java language is widely used in the embedded field, Java processors are gradually favored by system developers. The Java processor implements a Java Virtual Machine (Java Virtual Machine, JVM) through hardware, and can directly run Java bytecode. Like the Java virtual machine, most Java processors use a stack architecture, that is, in a Java processor system, most of the Java bytecode operations are related to the stack. [0003] The current embedded applications have an increasing demand for high-precision calculations, which requires Java processors to have...

AI Technical Summary

Problems solved by technology

However, in the Java processor system based on the stack architecture, only two operands can be provided at a time, which are respectively stored at the top of the stack (TOS) and the top of the second stack (NOS), so this method of parallel operation cannot be used.

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