How do I reduce the size of a function?

How do I reduce the size of a function?

7 Answers

1. Use generation functions instead of data tables where possible.
2. Disable inline functions.
3. Turn frequently used macros into functions.
4. Reduce resolution for variables larger than the native machine size (ie, 8 bit micro, try to get rid of 16 and 32 bit variables – doubles and quadruples some code sequences)

How is code size?

Code size is calculated by the actual size of the function and performance is profiled by executing the application to determine how many times the function is called under typical operating conditions. Initially, this only provides two system-level data points.

Why is code size important?

Code size is a main cost factor for many high volume electronic devices. It is therefore important to reduce the size of the applications in an embedded system. We try to exploit the back end code optimizations present in a production compiler to generate as few assembly instructions as possible.

How do I optimize my code?

Unroll small loops: Most of the times Compiler does this automatically, but it is a good habit of writing optimized codes. Matrix updations using this is very advantageous. Avoid calculations in loop: We should avoid any calculation which is more or less constant in value.

How do you optimize a program code?

Optimize Program Algorithm For any code, you should always allocate some time to think the right algorithm to use. So, the first task is to select and improve the algorithm which will be frequently used in the code. 2. Avoid Type Conversion Whenever possible, plan to use the same type of variables for processing.

How do I make my Arduino use less memory?

Table of contents

1. Reducing Your Memory Usage.
2. Knight’s Tour Puzzle running on an Arduino UNO.
3. Make sure variables only use the minimum size they require.
4. Use compiler constants rather than constant variables.
5. Put constant arrays in flash memory.
6. Dealing with recursion.
7. Understand compiler optimization.

How do I optimize my C++ code?

Summary of Strategies for Optimizing C++ Code

1. Use a Better Compiler, Use Your Compiler Better. C++ compilers are complex software artifacts.
2. Use Better Algorithms.
3. Use Better Libraries.
4. Reduce Memory Allocation and Copying.
5. Remove Computation.
6. Use Better Data Structures.
7. Increase Concurrency.
8. Optimize Memory Management.

How to tell when a function is increasing or decreasing?

This leads us to a method for finding when functions are increasing and decreasing. Let f be a continuous function on [a, b] and differentiable on (a, b). If f ′ (c) > 0 for all c in (a, b), then f is increasing on [a, b].

How can I reduce the size of my program?

As a result, tuning for code size could actually result in a smaller program with improved performance. In this stage, developers begin to narrow the scope of configuration options to specific functions or portions of functions, making the trade-off of larger code for improved performance where doing so yields the most benefit.

How are compilers used to reduce code size?

Compilers offer a number of optimizations, such as loop unrolling and in-lining code, that can increase performance while increasing code size, as shown in the code samples below. The value of such optimizations is dependent upon the number of times a particular function is called.

When to use derivatives in increasing and decreasing functions?

Derivatives are used to identify that the function is increasing or decreasing in a particular interval. Generally, we know that if something is increasing, it is going upward and if something is decreasing it is going downwards.