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Basic instruction cycle in a computer
The instruction cycle (also known as the fetch–decode–execute cycle, or simply the fetch–execute cycle) is the cycle that the central processing unit (CPU)
Instruction_cycle
Computer instruction executing another instruction
instruction set architecture (ISA), an execute instruction is a machine language instruction which treats data as a machine instruction and executes it
Execute_instruction
Model that describes the programmable interface of a computer processor
machines execute less frequently used code paths by interpretation (see: Just-in-time compilation). Transmeta implemented the x86 instruction set atop
Instruction_set_architecture
Central computer component that executes instructions
primary processor in a given computer. Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and
Central_processing_unit
Method of improving instruction-level parallelism
Decode, and Execute that have become common. The classic RISC pipeline comprises: Instruction fetch Instruction decode and register fetch Execute Memory access
Instruction_pipelining
Computer architecture to aid parallelism
instruction-level parallelism (ILP) by explicitly specifying, in advance, which instructions execute in parallel. VLIW architectures contrast with superscalar architectures
Very_long_instruction_word
Register that stores where in a program a processor is executing
stores where a computer program is being executed by a processor. It is also commonly called the instruction pointer (IP) in Intel x86 and Itanium microprocessors
Program_counter
Register in a CPU control unit holding the currently-executing instruction
instruction currently being executed or decoded. In simple processors, each instruction to be executed is loaded into the instruction register, which holds
Instruction_register
List of x86 microprocessor instructions
x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program
List_of_x86_instructions
Technology used in CPUs
or program instructions. An operating system supporting the NX bit can mark certain areas of the virtual address space as non-executable, preventing
NX_bit
Instruction in computer program
jump or transfer is an instruction in a computer program that can cause a computer to begin executing a different instruction sequence and thus deviate
Branch_(computer_science)
Ability of computer instructions to be executed simultaneously with correct results
With hardware-level parallelism, the processor decides which instructions to execute in parallel, at the time the code is already running, whereas software-level
Instruction-level_parallelism
Machine instruction that indicates to a computer to do nothing
cycles to execute. In other instruction sets, there is no explicit NOP instruction, but the assembly language mnemonic NOP represents an instruction which
NOP_(code)
List of RISC-V microprocessor instructions
instruction set refers to the set of instructions that RISC-V compatible microprocessors support. The instructions are usually part of an executable program
RISC-V_instruction_listings
Instructions directly executable by a computer
machine. A machine-code instruction causes the CPU to perform a specific task such as: Load a word from memory to a CPU register Execute an arithmetic logic
Machine_code
CPU that implements instruction-level parallelism within a single processor
called instruction-level parallelism within a single processor. In contrast to a scalar processor, which can execute at most one single instruction per clock
Superscalar_processor
Source code that alters its instructions to the hardware while executing
(SMC or SMoC) is code that alters its own instructions while it is executing – usually to reduce the instruction path length and improve performance or simply
Self-modifying_code
Data that causes a computer to follow indicated instructions
stored. A native executable is machine code and is directly executable at the instruction level of a CPU. A script is also executable although indirectly
Executable
Machine instruction executing another instruction repeatedly
computer instruction set architectures (ISA), a repeat instruction is a machine language instruction that repeatedly executes another instruction a fixed
Repeat_instruction
Layer of hardware-level instructions or data structures
to execute a single instruction, one clock cycle for each step in the microprogram for that instruction. Some CISC processors include instructions that
Microcode
Computer security exploit technique
call stack to hijack program control flow and then executes carefully chosen machine instruction sequences that are already present in the machine's
Return-oriented_programming
Aspect of the instruction set architecture of CPUs
nop | execute the following instruction +------+ (Effective PC address = next instruction address) The CPU, after executing a sequential instruction, immediately
Addressing_mode
Part of a machine instruction
an opcode may be referred to as an instruction machine code, instruction code, instruction syllable, instruction parcel, or opstring. For any particular
Opcode
Family of RISC-based computer architectures
care, and use of a new "IT" (if-then) instruction, which permits up to four successive instructions to execute based on a tested condition, or on its
Arm_architecture_family
1984 programming game
turns executing one instruction at a time. A program wins by terminating all opponents, typically by causing them to execute invalid instructions, leaving
Core_War
Instructions a computer can execute
A computer program is a sequence or set of instructions in a programming language for a computer to execute. It is one component of software, which also
Computer_program
Performing the actions encoded in a computer program
following a fetch–decode–execute cycle for each program instruction executed by the control unit. Source code may be executed by interpreter software.
Execution_(computing)
Computing paradigm to improve computational efficiency
cycles that would otherwise be wasted. In this paradigm, a processor executes instructions in an order governed by the availability of input data and execution
Out-of-order_execution
Software anomaly
enabled to forbid any execute access to the stack, the attacker can still use the overwritten return address (the instruction pointer) to point to data
Stack_buffer_overflow
Programmable machine that processes data
causing a program switch each time. Since modern computers typically execute instructions several orders of magnitude faster than human perception, it may
Computer
Form of conditionals in computer programming
instruction or a sequence of instructions to execute based on the predicate that controls whether the branch occurs, the instructions to be executed are
Predication (computer architecture)
Predication_(computer_architecture)
Component of computer engineering
microarchitecture designs. Some of these stages include instruction fetch, instruction decode, execute, and write back. Some architectures include other stages
Microarchitecture
Average number of instructions executed for each clock cycle
instruction. While early generations of CPUs carried out all the steps to execute an instruction sequentially, modern CPUs can do many things in parallel. As it
Instructions_per_cycle
Microprocessor instruction set architecture
architecture is based on explicit instruction-level parallelism, in which the compiler decides which instructions to execute in parallel. This contrasts with
IA-64
Instruction pipeline
fetches and tries to execute one instruction per cycle. The main common concept of each design is a five-stage execution instruction pipeline. During operation
Classic_RISC_pipeline
This is a list of the instructions that make up JVM bytecode, the abstract machine language that is executed by the Java virtual machine. JVM bytecode
List of JVM bytecode instructions
List_of_JVM_bytecode_instructions
of executed instructions occur or where most time is spent during the program's execution (not necessarily the same thing since some instructions are
Hot spot (computer programming)
Hot_spot_(computer_programming)
Address from which a CPU starts fetching instructions after a reset
location a central processing unit will go to find the first instruction it will execute after a reset. The reset vector is a pointer or address, where
Reset_vector
Topics referred to by the same term
(text editor), for UNIX ex (typography), a unit of distance EX, the execute instruction on the System/360 and the IBM 7030 Expected value or E(X) EX (calculator
EX
Computer exploit using just-in-time compilation
CPU to execute instructions in a way that was unintended by the JIT authors. The attacker is usually not even limited to the expected instruction boundaries;
JIT_spraying
Processor with instructions capable of multi-step operations
A complex instruction set computer (CISC /ˈsɪsk/) is a computer architecture in which single instructions can execute several low-level operations (such
Complex instruction set computer
Complex_instruction_set_computer
64-bit extension of x86 architecture
SSE2 instructions. SSE3 instructions and later Streaming SIMD Extensions instruction sets are not standard features of the architecture. No-Execute bit
X86-64
Digital circuit
until the conditional jump instruction has passed the execute stage before the next instruction can enter the fetch stage in the pipeline. The branch
Branch_predictor
Particular execution of a computer program
threads of execution that execute instructions concurrently. While a computer program is a passive collection of instructions typically stored in a file
Process_(computing)
Aspect of CPU performance
only after the previous instruction finishes at stage 5, therefore the number of clock cycles it takes to execute an instruction is five (CPI = 5 > 1).
Cycles_per_instruction
Microprocessor model
of the 8086 CPU was well balanced; with a typical instruction mix, an 8086 could execute instructions out of the prefetch queue a good bit of the time
Intel_8088
Way for programs to access kernel services
Unix-like systems, fork and execve are C library functions that in turn execute instructions that invoke the fork and exec system calls. Making the system call
System_call
Topics referred to by the same term
Riocorrente Exu, a type of spirit in Afro-Brazilian Quimbanda EXU, the execute instruction on the SDS 9 series Empress Lü (241–180 BC), courtesy name Exu Exandria
Exu
Software that executes source code directly
instructions that can be executed on the host hardware as key value pairs (or in more efficient designs, direct addresses to the native instructions)
Interpreter_(computing)
Undocumented CPU instruction that has an effect
unimplemented operation, unintended opcode or undocumented instruction, is an instruction to a CPU that is not mentioned in any official documentation
Illegal_opcode
Instruction scheduling method
used in the CDC 6600 computer, for dynamically scheduling instructions so that they can execute out of order when there are no conflicts and the hardware
Scoreboarding
An instruction window in computer architecture refers to the set of instructions which can execute out-of-order in a speculative processor. In particular
Instruction_window
Model independent architecture for the S/360 line of mainframe computers
to execute a privileged instruction when the problem state bit in the PSW is 1. An execute exception is recognized when the operand of an EXECUTE instruction
IBM_System/360_architecture
Family of instruction set architectures
they may execute multiple (partial or complete) x86 instructions simultaneously, and not necessarily in the same order as given in the instruction stream
X86
Software testing tool
IBM/360 through use of microcode emulation. To monitor and execute the machine code instructions (but treated as an input stream) on the same hardware for
Instruction_set_simulator
Type of program control instruction
control instruction present in some machine language instruction sets. Rather than specifying the address of the next instruction to execute, as in a
Indirect_branch
Part of a computer instruction
String instructions LODS, STOS, MOVS, CMPS, and SCAS normally execute just one iteration. If a REP prefix is added to any string instruction, it will
Opcode_prefix
Computer assembly language instruction
in the interrupt table to be executed. INT is widely used in real mode. In protected mode, INT is a privileged instruction. A software interrupt is a long
INT_(x86_instruction)
Computer instruction which pauses execution
interrupts to the CPU at regular intervals. Most operating systems execute a HLT instruction when there is no immediate work to be done, putting the processor
HLT_(x86_instruction)
Topics referred to by the same term
characters Text segment, the portion of computer file containing executable instructions Writing, representation of language in a textual medium This disambiguation
Text
Computer architecture treating code and data similarly, though not usually identically
MAXQ, can execute instructions fetched from any memory segment – unlike the original Harvard processor, which can only execute instructions fetched from
Modified_Harvard_architecture
Amount of useful work accomplished by a computer
estimated in terms of accuracy, efficiency and speed of executing computer program instructions. When it comes to high computer performance, one or more
Computer_performance
Instruction set architecture
microprocessors to execute software instructions in parallel by using the compiler, rather than complex on-die circuitry, to control parallel instruction execution
Explicitly parallel instruction computing
Explicitly_parallel_instruction_computing
Microprocessing technique
pre-process instructions during cache miss cycles. The pre-processed instructions are used to generate instruction and data stream prefetches by executing instructions
Runahead
Electrical component for processing data
operating environment. The operations are the set of instructions that the processor follows in order to execute its main function. Operations are written using
Processor_(computing)
Topics referred to by the same term
environments X file format, used by DirectX X, the mnemonic for the execute instruction on the TI-990 and the TMS9900 X#, a High-level assembler for the
X_(disambiguation)
Executable file format used for .EXE files in MS-DOS
The DOS MZ executable format is the executable file format used for .EXE files under the DOS and Windows operating systems. The file can be identified
DOS_MZ_executable
Operational mode of x86-compatible CPUs
processor that supports x86 protected mode is powered on, it begins executing instructions in real mode, in order to maintain backward compatibility with earlier
Protected_mode
to execute twelve or more instructions per clock cycle, when traditional CISC designs could take twelve or more cycles to execute one instruction. The
History of general-purpose CPUs
History_of_general-purpose_CPUs
Mainframe computer by Control Data
could only execute a limited number of simple instructions. A typical CPU of the era had a complex instruction set, which included instructions to handle
CDC_6600
16-bit microprocessor
execute instruction "X" (eXecute). This instruction executes the instruction in a register. It can be used for debugging (as a breakpoint instruction)
TMS9900
Instruction slot being executed without the effects of a preceding instruction
branch instruction on a RISC or DSP architecture; this instruction will execute even if the preceding branch is taken. This makes the instruction execute out-of-order
Delay_slot
Computer machine code instruction
is shared, a malicious user can execute them to launch a denial-of-service attack. In the case of real instructions, the implication of this expression
Halt and Catch Fire (computing)
Halt_and_Catch_Fire_(computing)
Set of rules describing computer system
interact to execute programs efficiently. It is often a general description that ignores precise implementation details. It covers the instruction set architecture
Computer_architecture
Number of machine code instructions required to execute a section of a computer program
In computer performance, the instruction path length is the number of machine code instructions required to execute a section of a computer program. The
Instruction_path_length
Computer optimization technique
computer resources, instructions can be scheduled at a time when it has not yet been determined that the instructions will need to be executed, ahead of a branch
Speculative_execution
Programming situation where an instruction refers to a prior instruction's data
following example, instruction 2 anti-depends on instruction 3 — the ordering of these instructions cannot be changed, nor can they be executed in parallel (possibly
Data_dependency
Type of computer instructions
manipulation instructions are instructions that perform bit manipulation operations in hardware, rather than requiring several instructions for those operations
Bit_manipulation_instructions
from an arbitrary address (since the execute instruction itself is a two-word instruction, nested execute instructions are not possible). There are unconditional
Varian_Data_Machines
Anomaly in computer security and programming
interpret the opcode FF E4 as the jmp esp instruction, and will then jump to the top of the stack and execute the attacker's code. When this technique
Buffer_overflow
Delay in the execution of a processor instruction in a pipeline
will determine whether the decoded instruction reads from a register to which the currently executed instruction writes. If this condition holds, the
Pipeline_stall
1970 minicomputer
subsequent instruction is either executed or skipped depending on the result of the test. The subsequent instruction is usually a jump instruction when more
ND812
Loop transformation technique
number of MVC * instructions per batch into R15 * (destroyed by the calculation in the * first instruction of the loop). B LOOP Execute loop again. * *
Loop_unrolling
Executable file format
the accepted standard for executables in EFI environments. On Windows NT systems, it currently supports a range of instruction sets, including IA-32, x86-64
Portable_Executable
Portion of an object file containing executable instructions
corresponding section of the program's virtual address space that contains executable instructions. The term "segment" comes from the memory segment, which is a historical
Code_segment
Efficiency improving technique for superscalar CPUs
only one thread of instructions can execute in any given pipeline stage at a time. In simultaneous multithreading, instructions from more than one thread
Simultaneous_multithreading
Topics referred to by the same term
or central processing unit, is a central computer component that executes instructions. CPU or cpu may also refer to: Carboxypeptidase B2, a human enzyme
CPU_(disambiguation)
Hardware cache of a central processing unit
for both executable instructions and data. A single TLB can be provided for access to both instructions and data, or a separate Instruction TLB (ITLB)
CPU_cache
SIMD CPU instruction set
instruction. This results in an issue where LZCNT called on some CPUs not supporting it, such as Intel CPUs prior to Haswell, may incorrectly execute
SSE4
Set of ranges of virtual addresses
addresses, which an operating system makes available to a process for executing instructions and storing data, and which it maps to the address space of physical
Virtual_address_space
Processor executing one instruction in minimal clock cycles
takes to execute the slowest sub-operation of any instruction; decreasing that cycle-time often accelerates the execution of other instructions. The focus
Reduced instruction set computer
Reduced_instruction_set_computer
Problems with central processing unit design
hazards are problems with the instruction pipeline in CPU microarchitectures when the next instruction cannot execute in the following clock cycle, and
Hazard (computer architecture)
Hazard_(computer_architecture)
Microprocessor developed by Sun Microsystems
The two ALUs can both execute arithmetic, logic and shift instructions but only one can execute multiply and divide instructions. The floating-point unit
UltraSPARC
8-bit microprocessor
internal operation. Multiple instructions actually end during the M1 of the next instruction which is known as a fetch/execute overlap. The Z80 machine cycles
Zilog_Z80
Programmable scientific calculator produced by Hewlett-Packard
steps, so that any step may be targeted by a GTO ("go to") or XEQ ("execute") instruction in the form A123 (or just A for the label step itself, A001). Any
HP_35s
Type of computer processor
one instruction per clock cycle. They can be considered in three broad types: Statically-scheduled superscalar architectures execute instructions in the
Wide-issue
Series of pioneering microprocessors from the 1980s
path, but unlike other designs of the time, many instructions took only one cycle to execute. Instruction opcodes were used as the entry points to the microcode
Transputer
Computer processor contained on an integrated-circuit chip
chip could end up using more power, as the chip must execute software with multiple instructions. However, others say that modern 8-bit chips are always
Microprocessor
Standard file format for executables, object code, shared libraries, and core dumps
information about ELF files, including the instruction set architecture for which the code in a relocatable, executable, or shared object file is intended, or
Executable and Linkable Format
Executable_and_Linkable_Format
Serial interface for testing integrated circuits
facilities 4 - Instruction Transfer Register (ITR), 33 bits (32 instructions plus one status bit) used to execute processor instructions while in a special
JTAG
EXECUTE INSTRUCTION
EXECUTE INSTRUCTION
Boy/Male
Indian
Sky, Education, Instruction
Boy/Male
Arabic, Muslim, Pashtun, Thai
An Executor; Preceptor; Administrator (of a will)
Boy/Male
Indian
Instruction, Courage, Daring, Guidance
Boy/Male
Scottish American German
Welshman; stranger. Famous Bearer: Scottish hero Sir William Wallace (executed in...
Girl/Female
Indian
Instruction, Courage, Daring, Guidance
Boy/Male
Muslim
Sky, Education, Instruction
Boy/Male
Arabic, Muslim
An Executor; Preceptor; Administrator (of a will)
Boy/Male
Arabic
Guidance; Instruction
Female
French
Modern form of French Igerne, a form of Welsh Eigyr, IGRAINE means "maiden, virgin." In Arthurian legend, this is the name of the wife of Uther Pendragon, the mother of Elaine, Morgan le Fay (Morgause), and King Arthur. While still married to Gorlois, her first husband, Uther falls in love with her and makes forceful advances. She tells Gorlois who takes her to Cornwall without asking the king's leave, giving Uther an excuse to make war on Gorlois.
Boy/Male
Arabic, Farsi, Iranian, Muslim
Guidance; Instruction
Boy/Male
Arabic, Muslim
Education; Instruction
Girl/Female
Muslim
Instruction, Courage, Daring, Guidance
Boy/Male
Muslim
Sky, Education, Instruction
Boy/Male
Indian
Sky, Education, Instruction
Male
Egyptian
, Horus the Executer of Justice.
Girl/Female
Arabic, Muslim
Instruction; Courage; Daring
Surname or Lastname
English
English : variant spelling of Hain 1–3.Isaac Hayne (1745–81) was an American revolutionary militia officer, executed by the British for breaking parole. He owned an ironworks and was manufacturing ammunition for the American forces when he was caught. His grandfather had emigrated from England to SC in about 1700.
Boy/Male
Muslim
Instruction
Boy/Male
Muslim
Instruction, Courage, Daring, Guidance
Boy/Male
Indian
Instruction
EXECUTE INSTRUCTION
EXECUTE INSTRUCTION
Boy/Male
Arabic, Bengali, Hindu, Indian, Marathi, Muslim, Parsi, Tamil, Zoroastrian
Scented; Blessing from God; Star; Tree of Heaven; King; Sweet Basil
Girl/Female
Hindu
Human, Born of Manu, Woman
Girl/Female
Hindu, Indian
Prosperous
Boy/Male
Muslim
Servant of the all-sufficient (Allah)
Surname or Lastname
English
English : from any of various places named in Old English as Äc lÄ“ah ‘oak clearing’. Possible sources include Acle in Norfolk, Aykley in Durham, and Ackley Farm in Powys. Compare Oakley, which has the same origin.Americanized spelling of Swiss German Egli.
Boy/Male
English American Teutonic
House wolf, protector. Mythological wolf was esteemed for courage.
Girl/Female
Hindu, Indian, Tamil
Illustrious
Girl/Female
Hindu
Kind
Boy/Male
Indian, Telugu
Lord Ram
Boy/Male
Hindu
EXECUTE INSTRUCTION
EXECUTE INSTRUCTION
EXECUTE INSTRUCTION
EXECUTE INSTRUCTION
EXECUTE INSTRUCTION
v. i.
To perform musically.
v. t.
To follow out or through to the end; to carry out into complete effect; to complete; to finish; to effect; to perform.
imp. & p. p.
of Execute
a.
Designed or fitted for execution, or carrying into effect; as, executive talent; qualifying for, concerned with, or pertaining to, the execution of the laws or the conduct of affairs; as, executive power or authority; executive duties, officer, department, etc.
p. pr. & vb. n.
of Execute
v. t.
That which is offered as a reason for being excused; a plea offered in extenuation of a fault or irregular deportment; apology; as, an excuse for neglect of duty; excuses for delay of payment.
v. t.
To infect capital punishment on; to put to death in conformity to a legal sentence; as, to execute a traitor.
v. t.
To free from an impending obligation or duty; hence, to disengage; to dispense with; to release by favor; also, to remit by favor; not to exact; as, to excuse a forfeiture.
v. t.
To complete, as a legal instrument; to perform what is required to give validity to, as by signing and perhaps sealing and delivering; as, to execute a deed, lease, mortgage, will, etc.
v. t.
To give effect to; to do what is provided or required by; to perform the requirements or stimulations of; as, to execute a decree, judgment, writ, or process.
n.
In dancing, the number of persons necessary to execute a quadrille; also, the series of figures or movements executed.
n.
One who executes; an executer.
n.
The person appointed by a testator to execute his will, or to see its provisions carried into effect, after his decease.
v. t.
To pardon, as a fault; to forgive entirely, or to admit to be little censurable, and to overlook; as, we excuse irregular conduct, when extraordinary circumstances appear to justify it.
v. t.
Too put to death illegally; to kill.
v. i.
To do one's work; to act one's part of purpose.
n.
One who executes or performs; a doer; as, an executor of baseness.
n.
One who performs or carries into effect. See Executor.
v. t.
To call to activity in any way; to rouse to feeling; to kindle to passionate emotion; to stir up to combined or general activity; as, to excite a person, the spirits, the passions; to excite a mutiny or insurrection; to excite heat by friction.
v. t.
To perform, as a piece of music, either on an instrument or with the voice; as, to execute a difficult part brilliantly.