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MPLAB XC8 C Compiler User’s Guide for PIC MCU
MPLAB XC8 C Compiler User’s Guide for PIC MCU
  1. Home
  2. 3 How Tos
  3. 3.5 Understanding the Compilation Process
  4. 3.5.19 What Optimizations Are Employed by the Compiler?
  • Notice to Development Tools Customers
  • 1 Preface
  • 2 Compiler Overview
  • 3 How Tos
    • 3.1 Installing and Activating the Compiler
    • 3.2 Invoking the Compiler
    • 3.3 Writing Source Code
    • 3.4 Getting My Application To Do What I Want
    • 3.5 Understanding the Compilation Process
      • 3.5.1 What’s the Difference Between a licensed and unlicensed compiler?
      • 3.5.2 How Can I Make My Code Smaller?
      • 3.5.3 How Can I Reduce RAM Usage?
      • 3.5.4 How Can I Make My Code Faster?
      • 3.5.5 How Can I Speed Up Programming Times?
      • 3.5.6 How Does the Compiler Place Everything in Memory?
      • 3.5.7 How Can I Make My Interrupt Routine Faster?
      • 3.5.8 How Big Can C Variables Be?
      • 3.5.9 How Do I Utilize/Allocate the RAM Banks on My Device?
      • 3.5.10 How Do I Utilize the Linear Memory on Enhanced Mid-range PIC Devices?
      • 3.5.11 What Devices are Supported by the Compiler?
      • 3.5.12 How Do I Know What Code the Compiler Is Producing?
      • 3.5.13 How Can I Tell How Big a Function Is?
      • 3.5.14 How Do I Know Which Resources Are Being Used by Each Function?
      • 3.5.15 How Do I Find Out Where Variables and Functions Have Been Positioned?
      • 3.5.16 Why Are Some Objects Positioned Into Memory That I Reserved?
      • 3.5.17 How Do I Know How Much Memory Is Still Available?
      • 3.5.18 How Do I Use Library Files in My Project?
      • 3.5.19 What Optimizations Are Employed by the Compiler?
      • 3.5.20 Why Do I Get Out-of-memory Errors When I Select a Debugger?
      • 3.5.21 How Do I Know Which Stack Model the Compiler Has Assigned to a Function?
      • 3.5.22 How Do I Know What Value Has Been Programmed in the Configuration Bits or ID Location?
      • 3.5.23 How Do I Stop My Project’s Checksum From Changing?
    • 3.6 Fixing Code That Does Not Work
  • 4 Command-line Driver
  • 5 C Language Features
  • 6 Macro Assembler
  • 7 Linker
  • 8 Utilities
  • 9 Library Functions
  • 10 Error and Warning Messages
  • 11 Implementation-Defined Behavior
  • 12 Document Revision History
  • Microchip Information

3.5.19 What Optimizations Are Employed by the Compiler?

Optimizations are employed at both the C and assembly level of compilation. These are described in 5.13 Optimizations and 6.2 Assembly-Level Optimizations respectively. The options that control optimization are described in 4.6.6 Options for Controlling Optimization.

The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.

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