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MPLAB XC-DSC C Compiler User's Guide
MPLAB XC-DSC C Compiler User's Guide
  1. Home
  2. 4 How To's
  3. 4.5 Understanding the Compilation Process
  4. 4.5.10 Which Optimizations Will Be Applied to My Code?

  • Notice to Development Tools Customers
  • 1 Preface
  • 2 Compiler Overview
  • 3 Compiler and Other Development Tools
  • 4 How To's
    • 4.1 Installing and Activating the Compiler
    • 4.2 Invoking the Compiler
    • 4.3 Writing Source Code
    • 4.4 Getting My Application to Do What I Want
    • 4.5 Understanding the Compilation Process
      • 4.5.1 How Does Licensing Affect Features and Optimization Levels?
      • 4.5.2 Why Can’t I Debug my Code after I Optimize?
      • 4.5.3 How Can I Make My Code Smaller?
      • 4.5.4 How Can I Reduce RAM Usage?
      • 4.5.5 How Can I Make My Code Faster?
      • 4.5.6 What are the Speed vs. Size Tradeoffs?
      • 4.5.7 How Can I Control Where the Language Tool Places Objects in Memory?
      • 4.5.8 How Can I Make My Interrupt Routine Faster?
      • 4.5.9 How Big Can C Variables Be?
      • 4.5.10 Which Optimizations Will Be Applied to My Code?
      • 4.5.11 Which Devices are Supported by the Compiler?
      • 4.5.12 How Do I Know What Code the Compiler Is Producing?
      • 4.5.13 How Can I Tell How Big a Function Is?
      • 4.5.14 How Do I Learn Where Variables and Functions Have Been Positioned?
      • 4.5.15 How Do I Properly Reserve Memory?
      • 4.5.16 How Do I Know How Much Memory Is Still Available?
      • 4.5.17 Which Libraries Get Included by Default?
      • 4.5.18 How Do I Create My Own Libraries?
      • 4.5.19 Why Do I Get Out-of-Memory Errors When I Select a Debugger?
      • 4.5.20 How Do I Stop My Project's Checksum From Changing?
    • 4.6 Fixing Code That Does Not Work
  • 5 XC-DSC Toolchain and MPLAB® X IDE
  • 6 Compiler Command-Line Driver
  • 7 Device-Related Features
  • 8 Differences Between MPLAB® XC-DSC and C Standard
  • 9 Supported Data Types and Variables
  • 10 Fixed-Point Arithmetic Support - dsPIC33C/E/F and dsPIC30 Only
  • 11 Memory Allocation and Access
  • 12 Operators and Statements
  • 13 Register Usage
  • 14 Functions
  • 15 Interrupts
  • 16 Main, Runtime Startup and Reset
  • 17 Mixing C and Assembly Code
  • 18 Library Routines
  • 19 Optimizations
  • 20 Preprocessing
  • 21 Linking Programs
  • 22 Implementation-Defined Behavior
  • 23 Embedded Compiler Compatibility Mode
  • 24 Common C Interface
  • 25 Diagnostic Pragmas
  • 26 Diagnostic Messages
  • 27 GNU Free Documentation License
  • 28 Built-in Functions
  • 29 Document Revision History
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4.5.10 Which Optimizations Will Be Applied to My Code?

Code optimizations available depend on your compiler license. For more information, refer to the following chapter and section of this user’s guide:

19 Optimizations

6.6.6 Options for Controlling Optimization

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