SW006015 Microchip Technology, SW006015 Datasheet - Page 31

• Manufacturer Part Number: SW006015
• Description: C COMPILER MPLAB C32
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC32r

Specifications of SW006015

• Supported Families: PIC32MX5, MX6, And MX7
• Core Architecture: PIC
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC32 MCUs
• Tool Function: Compiler
• Supported Devices: PIC32 MCUs
• Tool Type: Compiler
• Processor Series: PIC32
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: PIC32
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2007 Microchip Technology Inc.
1.8.6
The following options control compiler optimizations.
TABLE 1-8:
The following options control specific optimizations. The -O2 option turns on all of
these optimizations except -funroll-loops, -funroll-all-loops and
-fstrict-aliasing.
-O0
-O
-O1
-O2
-O3
-Os
Options for Controlling Optimization
Option
GENERAL OPTIMIZATION OPTIONS
Do not optimize. (This is the default.)
Without -O, the compiler’s goal is to reduce the cost of
compilation and to make debugging produce the expected
results. Statements are independent: if you stop the program
with a breakpoint between statements, you can then assign a
new value to any variable or change the program counter to
any other statement in the function and get exactly the results
you would expect from the source code.
The compiler only allocates variables declared register in
registers.
Optimization level 1. Optimizing compilation takes somewhat
longer, and a lot more host memory for a large function.
With -O, the compiler tries to reduce code size and execution
time.
When -O is specified, the compiler turns on
-fthread-jumps and
-fomit-frame-pointer.
Optimization level 2. MPLAB C32 C compiler performs nearly
all supported optimizations that do not involve a space-speed
trade-off. -O2 turns on all optional optimizations except for
loop unrolling (-funroll-loops), function inlining
(-finline-functions), and strict aliasing optimizations
(-fstrict-aliasing). It also turns on force copy of
memory operands (-fforce-mem) and Frame Pointer
elimination (-fomit-frame-pointer). As compared to -O,
this option increases both compilation time and the
performance of the generated code.
Optimization level 3. -O3 turns on all optimizations specified
by -O2 and also turns on the inline-functions option.
Optimize for size. -Os enables all -O2 optimizations that do
not typically increase code size. It also performs further
optimizations designed to reduce code size.
-fdefer-pop. The compiler turns on
Definition
DS51686A-page 27