Abstract:
A high-performance, superscalar-based computer system with out-of-order instruction execution for enhanced resource utilization and performance throughput. The computer system fetches a plurality of fixed length instructions with a specified, sequential program order (in-order). The computer system includes an instruction execution unit including a register file, a plurality of functional units, and an instruction control unit for examining the instructions and scheduling the instructions for out-of-order execution by the functional units. The register file includes a set of temporary data registers that are utilized by the instruction execution control unit to receive data results generated by the functional units. The data results of each executed instruction are stored in the temporary data registers until all prior instructions have been executed, thereby retiring the executed instruction in-order.
Abstract:
A high-performance, superscalar-based computer system with out-of-order instruction execution for enhanced resource utilization and performance throughput. The computer system fetches a plurality of fixed length instructions with a specified, sequential program order (in-order). The computer system includes an instruction execution unit including a register file, a plurality of functional units, and an instruction control unit for examining the instructions and scheduling the instructions for out-of-order execution by the functional units. The register file includes a set of temporary data registers that are utilized by the instruction execution control unit to receive data results generated by the functional units. The data results of each executed instruction are stored in the temporary data registers until all prior instructions have been executed, thereby retiring the executed instruction in-order.
Abstract:
A system and method for extracting complex, variable length computer instructions from a stream of complex instructions each subdivided into a variable number of instructions bytes, and aligning instruction bytes of individual ones of the complex instructions. The system receives a portion of the stream of complex instructions and extracts a first set of instruction bytes starting with the first instruction bytes, using an extract shifter. The set of instruction bytes are then passed to an align latch where they are aligned and output to a next instruction detector. The next instruction detector determines the end of the first instruction based on said set of instruction bytes. An extract shifter is used to extract and provide the next set of instruction bytes to an align shifter which aligns and outputs the next instruction. The process is then repeated for the remaining instruction bytes in the stream of complex instructions. The isolated complex instructions are decoded into nano-instructions which are processed by a RISC processor core.
Abstract:
A memory control unit for controlling access, by one or more devices within a processor, to a memory array unit external to the processor via one or more memory ports of the processor. The memory control unit includes a switch network to transfer data between the one or more devices of the processor and the one or more memory ports of the processor. The memory control unit also includes a switch arbitration unit to arbitrate for the switch network, and a port arbitration unit to arbitrate for the one or more memory ports.
Abstract:
A register renaming system for out-of-order execution of a set of reduced instruction set computer instructions having addressable source and destination register fields, adapted for use in a computer having an instruction execution unit with a register file accessed by read address ports and for storing instruction operands. A data dependence check circuit is included for determining data dependencies between the instructions. A tag assignment circuit generates one of more tags to specify the location of operands, based on the data dependencies determined by the data dependence check circuit. A set of register file port multiplexers select the tags generated by the tag assignment circuit and pass the tags onto the read address ports of the register file for storing execution results.
Abstract:
A system and method for transferring data in a multiprocessor architecture capable of supporting multiple processors. The system comprises a priority assignor that provides a dynamic priority to input/output unit (IOU), D-cache and I-cache devices requests as a function of an intrinsic priority assigned to each device and a plurality of factors including the existence of a row match between a requested address and a previously serviced request, the number of times a device has been denied service and the number of times a device has been serviced without interruption. The system also includes a tracker to keep track of the number of times each of the factors occurs and a priority changer to change the priority of the devices as a function of the intrinsic priority and the number.
Abstract:
A high-performance, superscalar-based computer system with out-of-order instruction execution for enhanced resource utilization and performance throughput. The computer system fetches a plurality of fixed length instructions with a specified, sequential program order (in-order). The computer system includes an instruction execution unit including a register file, a plurality of functional units, and an instruction control unit for examining the instructions and scheduling the instructions for out-of-order execution by the functional units. The register file includes a set of temporary data registers that are utilized by the instruction execution control unit to receive data results generated by the functional units. The data results of each executed instruction are stored in the temporary data registers until all prior instructions have been executed, thereby retiring the executed instructions in-order.
Abstract:
The high-performance, RISC core based microprocessor architecture includes an instruction fetch unit for fetching instruction sets from an instruction store and an execution unit that implements the concurrent execution of a plurality of instructions through a parallel array of functional units. The fetch unit generally maintains a predetermined number of instructions in an instruction buffer. The execution unit includes an instruction selection unit, coupled to the instruction buffer, for selecting instructions for execution, and a plurality of functional units for performing instruction specified functional operations. A unified instruction scheduler, within the instruction selection unit, initiates the processing of instructions through the functional units when instructions are determined to be available for execution and for which at least one of the functional units implementing a necessary computational function is available. Unified scheduling is performed across mutliple execution data paths, where each execution data path, and corresponding functional units, is generally optimized for the type of computational function that is to be performed on the data: integer, floating point, and boolean. The number, type and computational specifics of the functional units provided in each data path, and as between data paths, are mutually independent.
Abstract:
A high-performance, superscalar-based computer system with out-of-order instruction execution for enhanced resource utilization and performance throughput. The computer system fetches a plurality of fixed length instructions with a specified, sequential program order (in-order). The computer system includes an instruction execution unit including a register file, a plurality of functional units, and an instruction control unit for examining the instructions and scheduling the instructions for out-of-order execution by the functional units. The register file includes a set of temporary data registers that are utilized by the instruction execution control unit to receive data results generated by the functional units. The data results of each executed instruction are stored in the temporary data registers until all prior instructions have been executed, thereby retiring the executed instructions in-order.
Abstract:
A integrated structure layout for integrating Data Dependency Comparator (DDC) blocks, Tag Assignment Logic (TAL) blocks, and Register Port Multiplexer (RPM) blocks to conserve valuable semiconductor real estate. The DDC blocks are arranged in rows and columns. The TAL blocks are coupled to the DDC blocks to receive dependency information. The TAL blocks are positioned in one or more of the layout regions so as to be integrated with the DDC blocks to conserve area on the integrated circuit chip. The RPM blocks are coupled to the TAL blocks to receive tag information.