Motorola DSP56800 Guía de usuario descargar pdf (Pagina 124)

100

101

C for DSP56800E

User Stack Allocation

124

Targeting MC56F83xx/DSP5685x Controllers

asm(nop);}

#pragma check_inline_sp_effects on

int func()

{

int a=1, b=1, c;

if (a)

{

EnterCritical();

c = a+b;

}

else {

EnterCritical();

c = b++;

}

return (b+c);

}

This example will generate the following warning:

Warning : Cannot determine SP modification value at compile time

M56800E_main.c line 20 EnterCritical();

This example is not legal since the SP is modified by run-time dependent amount.

If all inline assembly modifications to the SP along all branches are equal approaching

the exit of a function, it is not necessary to explicitly deallocate the increased stack

space. The compiler “cleans up” the extra inline assembly stack allocation

automatically at the end of the function.

Listing 6.4 Example 4 – Automatic Deallocation of Inline Assembly Stack

Allocation

#pragma check_inline_sp_effects on

int func()

{

int a=1, b=1, c;

if (a)

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Motorola DSP56800 Guía de usuario Pagina 124

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