公开(公告)号：JPH07295811A

公开(公告)日：1995-11-10

申请号：JP10142795

申请日：1995-04-25

Applicant: ADVANCED MICRO DEVICES INC

Inventor： JIERARUDO DEI ZURAASUKI JIYUNI ,  SUKOTSUTO EI HOWAITO ,  MIYURARI ESU CHINNAKONDA ,  DEIBITSUDO ESU KURISUTEII

IPC: G06F9/30 ,  G06F9/302 ,  G06F9/312 ,  G06F9/318 ,  G06F9/38

Abstract: PURPOSE: To provide a processor executing operation by an operand with variable size. CONSTITUTION: The processor 10 contains an instruction decoder 18 that includes a means dividing an operand into fields in a variable size operand, a means designating whether or not each field is defined with respect to its operation, and contains a re-order buffer including an operand data storage memory coupled with the decoder 18, a means detecting data dependency to each operand filed independently of other field, buses 30, 31, 32 coupled with the buffer 26 and communicating operand data for a field defined independently of other field, and function units 20, 21, 22, 80 coupled with the buses, executing the operation and generating execution result data.

公开(公告)号：JPH07334361A

公开(公告)日：1995-12-22

申请号：JP13401195

申请日：1995-05-31

Applicant: ADVANCED MICRO DEVICES INC

Inventor： DEIBITSUDO ESU KURISUTEII ,  SUKOTSUTO EI HOWAITO ,  MAIKERU DEII GOTSUDAADO

IPC: G06F9/30 ,  G06F9/318 ,  G06F9/32 ,  G06F9/38

Abstract: PURPOSE: To speedily and efficiently generate and execution program counter value by using a low-order program counter value bit from a fetch program counter circuit in an execution program counter circuit. CONSTITUTION: The execution program counter generation circuit 598 is provided with a low-order program counter generator 600, a high-order program counter generator 602 and an execution program counter controller 604. The low-order program counter generator 600 has an entry multiplexer 610, a branch multiplexer 612 and a register 614. The entry multiplexer 610 receivers the part of the lower four bits of a program counter value of an instruction and gives one of the counter values to the branch multiplexer 612. The branch multiplexer 612 receives the branched low-order bits, gives four bits low-order execution counter value to the register 614 and outputs the value as the next execution program counter value.