'Loop' diaporamas de présentation

Jeff Edmonds York University

Models of Computability. History & Overview Church's Thesis Goto vs Loop Models Turing Machines Loop Invariant Example Adding Example (single tape) Adding Example (multi tape) Table Lookup Example Single vs Multi Tape TMs Java to TM Constant vs Finite vs Infinite Universal TM

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Objectives

Chapter 6 Repetition. Objectives. ? To understand basic loop concepts: ? pretest loops and post-test loops ? loop initialization and updating ? event and counter controlled loops

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CS 3343: Analysis of Algorithms

CS 3343: Analysis of Algorithms. Correctness Proof, Order of Growth, Asymptotic Notations. What is an algorithm?. Algorithms are the ideas behind computer programs. An algorithm is the thing that stays the same regardless of programming language and the computing hardware.

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Chapter 5: Loops and Files

Chapter 5: Loops and Files. 5.1. The Increment and Decrement Operators. The Increment and Decrement Operators. ++ is the increment operator. It adds one to a variable. val++; is the same as val = val + 1; ++ can be used before (prefix) or after (postfix) a variable: ++val; val++;.

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Course project presentations

Course project presentations. Midterm project presentation Originally scheduled for Tuesday Nov 4 th Can move to Th Nov 6 th or Th Nov 13 th. From last time: Loop-invariant code motion. Two steps: analysis and transformations Step1: find invariant computations in loop

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Control Structures

Control Structures. In Text: Chapter 7. Outline. Control structures Selection One-way Two-way Multi-way Iteration Counter-controlled Logically-controlled Gotos Guarded statements. Levels of Control Flow. Within expressions Among program statements Among program units.

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Basic concept of Sequential Design

Basic concept of Sequential Design. Sequential code. Code written within the following statements execute sequentially. Process Functions Procedures. Process. A process is a sequential section of VHDL code. It is characterized by the presence of following statements: If Statements

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Flow of Control: Loops

Flow of Control: Loops. Chapter 4. Java Loop Statements. A portion of a program that repeats a statement or a group of statements is called a loop . The statement or group of statements to be repeated is called the body of the loop.

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Building Java Programs

Building Java Programs. Chapter 2 Lecture 2-2: The for Loop reading: 2.3 self-check: 12-26 exercises: 2-14 videos: Ch. 2 #3. Increment and decrement. shortcuts to increase or decrease a variable's value by 1 Shorthand Equivalent longer version variable ++; variable = variable + 1;

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Program design and analysis

Program design and analysis. Optimizing for execution time. Optimizing for energy/power. Optimizing for program size. Motivation. Embedded systems must often meet deadlines. Faster may not be fast enough. Need to be able to analyze execution time. Worst-case, not typical.

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Outline

Outline. Altering flow of control Boolean expressions Conditional Statements The while Statement Other Repetition Statements. Repetition statements. A repetition statement allows us to execute a statement multiple times Often is referred to as loop Like conditional statements

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JMP and Loops Memory Operand Move Instruction Array Data Related Operation and Directives

JMP and Loops Memory Operand Move Instruction Array Data Related Operation and Directives. JMP and Loop

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Routing loops

Routing loops. And other problems CCNA 2 Chapter 4. Routing loops. A problem that can occur with distance vector routing protocols It happens when systems are slow to converge so that routers have inconsistent routing tables Packets can be forwarded in the wrong direction

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Defining a P-T-loop

Defining a P-T-loop. Pressure [Bar]. Temperature [C]. Defining a P-T-loop. Use bulk composition for TN205. In THERIN:. 600 4000 0 SI(50.36)AL(30.54)FE(6.23)MG(2.46)CA(1.07)NA(4.62)K(4.73)O(160.965) H(60)O(30) * TN205 fin. Defining a P-T-loop. Defining a P-T-loop.

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Static Scheduling Techniques

Static Scheduling Techniques. Local scheduling (within a basic block) Loop unrolling Software pipelining (modulo scheduling) Trace scheduling Predication. 5 cycles/iteration. 14 cycles/4 iterations (3.5 cycles/iteration). Loop Unrolling (1 of 2). Unroll the loop (e.g., four times).

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Programming patterns involving iteration

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Building Java Programs

Building Java Programs. Chapter 2 Lecture 2-2: The for Loop reading: 2.3. for loop syntax. for ( initialization ; test ; update ) { statement ; statement ; ... statement ; } Perform initialization once. Repeat the following: Check if the test is true. If not, stop.

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