Motorola DSP56800 Guía de usuario descargar pdf (Pagina 403)

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Pragmas for the DSP56800 and DSP56800E

Pragma Reference

403Targeting MC56F83xx/DSP5685x Controllers

Prototype

#pragma opt_lifetimes on | off | reset

Remarks

If you enable this pragma, the compiler uses the same processor register for different

variables that exist in the same routine but not in the same statement.

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

panel.

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

Checking Settings

. By default, this pragma is disabled.

opt_loop_invariants

Controls the use of loop invariant optimization.

Prototype

#pragma opt_loop_invariants on | off | reset

Remarks

If you enable this pragma, the compiler moves all computations that do not change

inside a loop outside the loop, which then runs faster.

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

panel.

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

Checking Settings

. By default, this pragma is disabled.

opt_propagation

Controls the use of copy and constant propagation optimization.

Prototype

#pragma opt_propagation on | off | reset

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