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MPLAB XC-DSC C Compiler User's Guide
MPLAB XC-DSC C Compiler User's Guide
  1. Home
  2. 6 Compiler Command-Line Driver
  3. 6.6 Driver Option Descriptions
  4. 6.6.6 Options for Controlling Optimization

  • Notice to Development Tools Customers
  • 1 Preface
  • 2 Compiler Overview
  • 3 Compiler and Other Development Tools
  • 4 How To's
  • 5 XC-DSC Toolchain and MPLAB® X IDE
  • 6 Compiler Command-Line Driver
    • 6.1 Invoking the Compiler
    • 6.2 The Compilation Sequence
    • 6.3 Runtime Files
    • 6.4 Compiler Output
    • 6.5 Compiler Messages
    • 6.6 Driver Option Descriptions
      • 6.6.1 Options Specific to DSC Devices
      • 6.6.2 Options for Controlling the Kind of Output
      • 6.6.3 Options for Controlling the C Dialect
      • 6.6.4 Options for Controlling Warnings and Errors
      • 6.6.5 Options for Debugging
      • 6.6.6 Options for Controlling Optimization
        • 6.6.6.1 -O0: Level 0 Optimizations
        • 6.6.6.2 -O1, -O: Level 1 Optimizations
        • 6.6.6.3 -O2: Level 2 Optimizations
        • 6.6.6.4 -O3: Level 3 Optimizations
        • 6.6.6.5 -Os: Level s Optimizations Option
        • 6.6.6.6 Options For Specific Optimization Control
        • 6.6.6.7 Options that Specify Machine-Independent Flags
      • 6.6.7 Options for Controlling the Preprocessor
      • 6.6.8 Options for Assembling
      • 6.6.9 Options for Linking
      • 6.6.10 Options for Directory Search
      • 6.6.11 Options for Code Generation Conventions
      • 6.6.12 Miscellaneous Options
    • 6.7 MPLAB® X IDE Toolchain Equivalents
  • 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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6.6.6 Options for Controlling Optimization

The following options control compiler optimizations. See also Optimizations.

Table 6-4. General Optimization Options
OptionLicenseSummary
-O0AllNo optimizations (default)
-O1, -OAllOptimization level 1
-O2AllOptimization level 2
-O3PROOptimization level 3
-OsPROOptimization level s

Other optimization options are:

Options For Specific Optimization Control

Options that Specify Machine-Independent Flags

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