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Language Specifics
1.8.6
Options for Controlling Optimization
The following options control compiler optimizations.
TABLE 1-8:
GENERAL OPTIMIZATION OPTIONS
-O0
-O
-O1
-O2
-O3
-Os
Option
Definition
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
-fdefer-pop . The compiler turns on
-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.
The following options control specific optimizations. The -O2 option turns on all of
these optimizations except -funroll-loops , -funroll-all-loops and
-fstrict-aliasing .
? 2007 Microchip Technology Inc.
DS51686A-page 27
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相关PDF资料
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
BOARD EVAL N SY87729 EXPERIMENT
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