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MPLAB® XC-DSC C/C++ Compiler User Guide for dsPIC33A DSC
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6
Compiler Command-Line Driver
6.7
Driver Option Descriptions
6.7.6
Options for Controlling Optimization
6.7.6.6
Options For Specific Optimization Control
6.7.6.6.18
-frerun-loop-opt
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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 Supporting IDEs
6
Compiler Command-Line Driver
6.1
Invoking the Compiler
6.2
The C Compilation Sequence
6.3
The C++ Compilation Sequence
6.4
Runtime Files
6.5
Compiler Output
6.6
Compiler Messages
6.7
Driver Option Descriptions
6.7.1
Options Specific to
32-bit DSC
Devices
6.7.2
Options for Controlling the Kind of Output
6.7.3
Options for Controlling the C Dialect
6.7.4
Options for Controlling Warnings and Errors
6.7.5
Options for Debugging
6.7.6
Options for Controlling Optimization
6.7.6.1
-O0: Level 0 Optimizations
6.7.6.2
-O1, -O: Level 1 Optimizations
6.7.6.3
-O2: Level 2 Optimizations
6.7.6.4
-O3: Level 3 Optimizations
6.7.6.5
-Os: Level s Optimizations Option
6.7.6.6
Options For Specific Optimization Control
6.7.6.6.1
-falign-functions
6.7.6.6.2
-falign-labels
6.7.6.6.3
-falign-loops
6.7.6.6.4
-fcaller-saves
6.7.6.6.5
-fcse-follow-jumps
6.7.6.6.6
-fcse-skip-blocks
6.7.6.6.7
-fexpensive-optimizations
6.7.6.6.8
-ffunction-sections
6.7.6.6.9
-fdata-sections
6.7.6.6.10
-fgcse
6.7.6.6.11
-fgcse-lm
6.7.6.6.12
-fgcse-sm
6.7.6.6.13
-fno-defer-pop
6.7.6.6.14
-fno-peephole, -fno-peephole2
6.7.6.6.15
-fno-zero-initialized-in-bss
6.7.6.6.16
-frename-registers
6.7.6.6.17
-frerun-cse-after-loop
6.7.6.6.18
-frerun-loop-opt
6.7.6.6.19
-fschedule-insns
6.7.6.6.20
-fschedule-insns2
6.7.6.6.21
-fstrength-reduce
6.7.6.6.22
-fstrict-aliasing
6.7.6.6.23
-fthread-jumps
6.7.6.6.24
-funroll-loops
6.7.6.6.25
-funroll-all-loops
6.7.6.7
Options that Specify Machine-Independent Flags
6.7.7
Options for Controlling the Preprocessor
6.7.8
Options for Assembling
6.7.9
Options for Linking
6.7.10
Options for Directory Search
6.7.11
Options for Code Generation Conventions
6.7.12
Miscellaneous Options
6.8
MPLAB® X IDE
Toolchain Equivalents
7
Device-Related Features
8
Differences Between
MPLAB® XC-DSC
and Language Standards
9
Supported Data Types and Variables
10
Fixed-Point Arithmetic Support
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
C Implementation-Defined Behavior
23
C++ Implementation-Defined Behavior
24
Embedded Compiler Compatibility Mode
25
Common C Interface
26
Diagnostic Pragmas
27
Diagnostic Messages
28
GNU Free Documentation License
29
Built-in Functions
30
Document Revision History
Microchip Information
6.7.6.6.18 -frerun-loop-opt
Run the loop optimizer twice.
DS-50003918B
