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Optimization Levels

Optimization Performance

–

Removes all functions that are never called

Simplifies functions with return values that are never used

Inlines calls to small functions

Identifies file

level variable characteristics

–

Performs control

flow

graph simplification

Allocates variables to registers

Performs loop rotation

Eliminates unused code

Simplifies expressions and statements

Expands calls to functions declared inline

–

Performs local copy/constant propagation

Removes unused assignments

Eliminates local common expressions

–

Default (

Performs loop optimizations

Eliminates global common sub

expressions

Eliminates global unused assignments

FUNCTION

LOCAL

FILE

PROGRAM

–

Optimizer levels zero through three, offer an increasing array of actions, as seen above. Higher

levels include all the functions of the lower ones. Increasing optimizer levels also increase the

scope of optimization, from considering the elements of single entry, single-exit functions only,

through all the elements in a file. The “-pm” option directs the optimizer to view numerous input

files as one large single file, so that optimization can be performed across the whole system.

D- 10 C28x – C Programming

Texas Instruments C28 Series Student Guide

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