Hitachi, Ltd.

Hewlett-packard Company

Tan Watanabe

Keiichi Kurakazu

Keisuke Toyama

Yugo Kashiwagi

Tohru Nojiri

Toshiaki Kohno

Shinobu Koizumi

Ichiro Kyushima

Singi Domen

Thoru Nojiri

Robert M English

Rajiv Gupta

Kuniaki Tabata

Frederic C Amerson

Kousuke Sakoda

Hidefumi Iwami

Shunpei Kawasaki

Hideki Nishino

A translator system for translating source programs into machine language programs in an electronic computer system. An object program common to a plurality of different machine types of computers are generated while implementing execution performance equivalent to object programs inherent to the computers. A compiler translates a source program into an abstract object program including an abstract machine instruction sequence and indication concerning allocation of abstract registers. An installer converts the abstract object program into a machine language program of target computer on the basis of executable computer specification information including register usage indication and machine instruction selecting rules.

Retargetable information process system

Compilier system using an intermediate abstract form and

In a digital computer, a circular queue of registers in a register file are allocated as temporary local storage for procedures rather than using the known caller/callee save convention in order to minimize main memory references. A called procedure dynamically allocates local registers as needed without regard to registers used by the caller of the procedure or by any callee of the procedure, whereby register allocation is not restricted by any predetermined window size. Local registers, including parameter passing registers, are allocated in the called procedure, rather than a priori at compile time, by adjusting register stack pointer values. Only the number of registers actually required by the procedure need by allocated. Optionally, rotating registers may be allocated among the local registers. Stack pointer values are stored in one of the parameter passing registers when a procedure is called. Hardware register file access circuitry maps virtual register numbers used by the procedures into the hardware register file. Upon return from a procedure, registers are deallocated by adjusting the register stack pointers to the values stored when the procedure was called.

Dynamic allocation of registers to procedures in a digital computer

In a computer system equipped with a large number of registers which have an access time much shorter than that of a main memory, a register designating address part in which the assignment of an area register having a register address of a register area as its value and the assignment of a register displacement value expressing a relative register address within the register area are combined is provided in each instruction so that, even when physical registers are increased, save and restore of registers attendant upon task switches, etc. may be lessened to attain a raised speed of program run processing. Besides, an address part for designating the main memory is provided in the same instruction.

RISC system with instructions which include register area and

RISC system capable of performing calls and returns without advancing or

In a computer system equipped with a large number of registers which have an access time much shorter than that of a main memory, a register designating address part in which the assignment of an area register having a register address of a register area as its value and the assignment of a register displacement value expressing a relative register address within the register area are combined is provided in each instruction so that, even when physical registers are increased, save and restore of registers attendant upon task switches, etc. may be lessened to attain a raised speed of program run processing. Besides, an address part for designating main memory is provided in the same instruction.

Data processing system having multiple register management for call and

In order to divide a memory addressed unidimensionally into a plurality of memory areas and to manage efficiently these memory areas, the address to be accessed inside the memory is determined on a software basis by a computer instruction by use of the value of a first pointer designating each memory area and the value of a second pointer designating the relative address in the designated memory area.

Data processing system having a plurality of register groups and a

RISC system performing calls and returns without saving or restoring

An input method and an input apparatus wherein a sketch read by an image scanner is displayed on the display, the class of component figure is designated thereon, characteristic values are input, and positions of characteristic points are designated such that a figure of fair copy is automatically prepared. Further, the sketch and the figure of fair copy are displayed being superposed upon each other while modifying the brightness or color so that the results of input can be easily recognized, making it possible to reduce the work for inputting the figure and to easily determine the size and position of the figure on the document which is a constituent component. In preparing the figure of fair copy by recognizing through a pattern recognition device the sketch that is input by the image scanner, furthermore, those portions that were not properly recognized are input again by the above method and apparatus.

Document input method and apparatus

Growing community of inventors

Yokohama, Japan

Tan Watanabe