SW006015【PDF 32/120 页】C COMPILER MPLAB C32

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MPLAB ? C32 C Compiler User’s Guide

You can use the following flags in the rare cases when “fine-tuning” of optimizations to

be performed is desired.

TABLE 1-9:

SPECIFIC OPTIMIZATION OPTIONS

DS51686A-page 28

Option

-falign-functions

-falign-functions =n

-falign-labels

-falign-labels= n

-falign-loops

-falign-loops= n

-fcaller-saves

-fcse-follow-jumps

-fcse-skip-blocks

-fexpensive-

optimizations

-ffunction-sections

-fdata-sections

-fgcse

Definition

Align the start of functions to the next power-of-two greater

than n , skipping up to n bytes. For instance,

-falign-functions=32 aligns functions to the next

32-byte boundary, but -falign-functions=24 would align

to the next 32-byte boundary only if this can be done by

skipping 23 bytes or less.

-fno-align-functions and -falign-functions=1 are

equivalent and mean that functions are not aligned.

The assembler only supports this flag when n is a power of

two, so n is rounded up. If n is not specified, use a

machine-dependent default.

Align all branch targets to a power-of-two boundary, skipping

up to n bytes like -falign-functions . This option can

easily make code slower, because it must insert dummy

operations for when the branch target is reached in the usual

flow of the code.

If -falign-loops or -falign-jumps are applicable and

are greater than this value, then their values are used instead.

If n is not specified, use a machine-dependent default which is

very likely to be 1, meaning no alignment.

Align loops to a power-of-two boundary, skipping up to n bytes

like -falign-functions . The hope is that the loop is

executed many times, which makes up for any execution of

the dummy operations.

If n is not specified, use a machine-dependent default.

Enable values to be allocated in registers that are clobbered

by function calls, by emitting extra instructions to save and

restore the registers around such calls. Such allocation is

done only when it seems to result in better code than would

otherwise be produced.

In common subexpression elimination, scan through jump

instructions when the target of the jump is not reached by any

other path. For example, when CSE encounters an if

statement with an else clause, CSE follows the jump when

the condition tested is false.

This is similar to -fcse-follow-jumps , but causes CSE to

follow jumps which conditionally skip over blocks. When CSE

encounters a simple if statement with no else clause,

-fcse-skip-blocks causes CSE to follow the jump around

the body of the if .

Perform a number of minor optimizations that are relatively

expensive.

Place each function or data item into its own section in the

output file. The name of the function or the name of the data

item determines the section's name in the output file.

Only use these options when there are significant benefits for

doing so. When you specify these options, the assembler and

linker may create larger object and executable files and is also

slower.

Perform a global common subexpression elimination pass.

This pass also performs global constant and copy

propagation.

? 2007 Microchip Technology Inc.

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