Motorola DSP56800 Guía de usuario descargar pdf (Pagina 405)

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101

Pragmas for the DSP56800 and DSP56800E

Pragma Reference

405Targeting MC56F83xx/DSP5685x Controllers

that the optimization is only applied when the array element arithmetic is not of an

unsigned type that is smaller than a pointer type.

This pragma does not correspond to any panel setting in the C/C++ Language

panel.

To check this setting, use __option (opt_strength_reduction_strict),

described in Checking Settings

. By default, this pragma is disabled.

opt_unroll_loops

Controls the use of loop unrolling optimization.

Prototype

#pragma opt_unroll_loops on | off | reset

Remarks

If you enable this pragma, the compiler places multiple copies of a loop’s statements

inside a loop to improve its speed.

This pragma does not correspond to any panel setting in the C/C++ Language

panel.

To check this setting, use __option (opt_unroll_loops), described in

Checking Settings

. By default, this pragma is disabled.

optimization_level

Controls global optimization.

Prototype

#pragma optimization_level 0 | 1 | 2 | 3 | 4

Remarks

This pragma specifies the degree of optimization that the global optimizer performs.

To select optimizations, use the pragma optimization_level with an argument

from 0 to 4. The higher the argument, the more optimizations performed by the global

optimizer.

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