Motorola DSP56800 Guía de usuario descargar pdf (Pagina 404)

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101

Pragmas for the DSP56800 and DSP56800E

Pragma Reference

404

Targeting MC56F83xx/DSP5685x Controllers

Remarks

If you enable this pragma, the compiler replaces multiple occurrences of one variable

with a single occurrence.

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

panel.

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

Checking Settings

. By default, this pragma is disabled.

opt_strength_reduction

Controls the use of strength reduction optimization.

Prototype

#pragma opt_strength_reduction on | off | reset

Remarks

If you enable this pragma, the compiler replaces array element arithmetic instructions

with pointer arithmetic instructions to make loops faster.

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

panel.

To check this setting, use __option (opt_strength_reduction), described

in Checking Settings

. By default, this pragma is disabled.

opt_strength_reduction_strict

Uses a safer variation of strength reduction optimization.

Prototype

#pragma opt_strength_reduction_strict on | off | reset

Remarks

Like the opt_strength_reduction

pragma, this setting replaces multiplication

instructions that are inside loops with addition instructions to speed up the loops.

However, unlike the regular strength reduction optimization, this variation ensures

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