JPS5731050A - Advance control system for branch instruction - Google Patents

Advance control system for branch instruction

Info

Publication number
JPS5731050A
JPS5731050A JP10592880A JP10592880A JPS5731050A JP S5731050 A JPS5731050 A JP S5731050A JP 10592880 A JP10592880 A JP 10592880A JP 10592880 A JP10592880 A JP 10592880A JP S5731050 A JPS5731050 A JP S5731050A
Authority
JP
Japan
Prior art keywords
instruction
branch
advance
taken
branch destination
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10592880A
Other languages
Japanese (ja)
Other versions
JPS6058489B2 (en
Inventor
Kazuyuki Shimizu
Yoshiyuki Mizushima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10592880A priority Critical patent/JPS6058489B2/en
Publication of JPS5731050A publication Critical patent/JPS5731050A/en
Publication of JPS6058489B2 publication Critical patent/JPS6058489B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/38—Concurrent instruction execution, e.g. pipeline, look ahead
    • G06F9/3836—Instruction issuing, e.g. dynamic instruction scheduling or out of order instruction execution
    • G06F9/3842—Speculative instruction execution
    • G06F9/3846—Speculative instruction execution using static prediction, e.g. branch taken strategy

Abstract

PURPOSE:To execute a branch instruction at a high speed, by starting to execute a branch destination instruction which has been taken in advance, to a memory device, in case when a branch destination address calculating state, etc. in the effective process of the branch instruction have become definite. CONSTITUTION:When it is detected that a banch instruction exists in instruction buffer registers 1-4, the branch instruction is taken in advance by utilizing a cycle between prescribed cycles. In this case, contents of flags IPF5-8 are inputted to an instruction selecting and generating circuit 15 together with pointers NSIP10-12, an instruction is selected from the instruction buffer through a selector 16, is sent to a decoder 17, and whether it is a branchable instruction or not is analyzed. In the event of being branchable, a branch destination address is calculated through the gap of 2 cycles, and the instruction is fetched to the memory device. In this way, the branch destination instruction is taken in advance at a high speed.
JP10592880A 1980-07-31 1980-07-31 Branch instruction advance control method Expired JPS6058489B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10592880A JPS6058489B2 (en) 1980-07-31 1980-07-31 Branch instruction advance control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10592880A JPS6058489B2 (en) 1980-07-31 1980-07-31 Branch instruction advance control method

Publications (2)

Publication Number Publication Date
JPS5731050A true JPS5731050A (en) 1982-02-19
JPS6058489B2 JPS6058489B2 (en) 1985-12-20

Family

ID=14420511

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10592880A Expired JPS6058489B2 (en) 1980-07-31 1980-07-31 Branch instruction advance control method

Country Status (1)

Country Link
JP (1) JPS6058489B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60105050A (en) * 1983-11-11 1985-06-10 Fujitsu Ltd Pipeline control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60105050A (en) * 1983-11-11 1985-06-10 Fujitsu Ltd Pipeline control system
JPS638492B2 (en) * 1983-11-11 1988-02-23 Fujitsu Ltd

Also Published As

Publication number Publication date
JPS6058489B2 (en) 1985-12-20

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