JPS5729152A - Information processor prefetching instruction - Google Patents

Information processor prefetching instruction

Info

Publication number
JPS5729152A
JPS5729152A JP10344080A JP10344080A JPS5729152A JP S5729152 A JPS5729152 A JP S5729152A JP 10344080 A JP10344080 A JP 10344080A JP 10344080 A JP10344080 A JP 10344080A JP S5729152 A JPS5729152 A JP S5729152A
Authority
JP
Japan
Prior art keywords
instruction
branch
buffer registers
word
nsips10
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
JP10344080A
Other languages
Japanese (ja)
Other versions
JPS6411973B2 (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 JP10344080A priority Critical patent/JPS5729152A/en
Publication of JPS5729152A publication Critical patent/JPS5729152A/en
Publication of JPS6411973B2 publication Critical patent/JPS6411973B2/ja
Granted 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 or look ahead
    • G06F9/3802—Instruction prefetching
    • G06F9/3804—Instruction prefetching for branches, e.g. hedging, branch folding

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Advance Control (AREA)

Abstract

PURPOSE:To process a branch instruction at a high speed by prefetching the branch instruction by decoding an instruction several instructions after a present instruction position. CONSTITUTION:Each time an instruction word is read out of a storage part, an instruction starting position in a new instruction word according to the decoding result of the bit of part of the readout instruction word and the states of a following instruction position flag NEXTIPF9 at the point in time and previously set instruction position flag IPFs5-8 in instruction buffer registers, and instruction flags NSIPs 10-12 in corresponding instruction buffer registers are set. Further, an instruction following or several instructions after the instruction, being fetched, indicated by pointers NSIPs10-12 is prefetched according to values of the pointers NSIPs10-12 and the instruction position flags IPFs5-8 in the instruction buffer registers, and when it is a branch instruction, a branch destination address is further calculated to read an instruction from the branch destination address in advance.
JP10344080A 1980-07-28 1980-07-28 Information processor prefetching instruction Granted JPS5729152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10344080A JPS5729152A (en) 1980-07-28 1980-07-28 Information processor prefetching instruction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10344080A JPS5729152A (en) 1980-07-28 1980-07-28 Information processor prefetching instruction

Publications (2)

Publication Number Publication Date
JPS5729152A true JPS5729152A (en) 1982-02-17
JPS6411973B2 JPS6411973B2 (en) 1989-02-28

Family

ID=14354088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10344080A Granted JPS5729152A (en) 1980-07-28 1980-07-28 Information processor prefetching instruction

Country Status (1)

Country Link
JP (1) JPS5729152A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312029A (en) * 1986-03-26 1988-01-19 Hitachi Ltd Information processor
JPH03156534A (en) * 1989-08-28 1991-07-04 Nec Corp Microprocessor
JPH0784782A (en) * 1993-09-09 1995-03-31 Nec Corp Information processor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312029A (en) * 1986-03-26 1988-01-19 Hitachi Ltd Information processor
JPH03156534A (en) * 1989-08-28 1991-07-04 Nec Corp Microprocessor
JPH0784782A (en) * 1993-09-09 1995-03-31 Nec Corp Information processor

Also Published As

Publication number Publication date
JPS6411973B2 (en) 1989-02-28

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