Object Code Accelerator Manual

Preparing Programs for Acceleration

Object Code Accelerator Manual—528144-003

3-9

Non-Standard Procedure Call or Return RP Values

after the RP directive, while at run time the hardware knows that a value is on the

stack.

The OCA option RETURNVALSIZE must be used for this procedure to return the three

values correctly:

RETURNVALSIZE FOO 3

Function f returns the type “void *” in this C example. You must either recompile this

program with a version of the C/C++ compiler released on or after 01DEC90 or specify

a RETURNVALSIZE option.

void *f(void)

{

return((void *) 0);

}

main()

{

char *cp;

cp = f();

}

Instead of recompiling, you can use the following RETURNVALSIZE option to produce

a correctly accelerated program:

RETURNVALSIZE 'f' 2

•

This example shows a function that returns a struct by value. You must either

recompile this program with a version of the C /C++ compiler released on or after

15JUN91 or specify a RETURNVALSIZE option.

#pragma runnable

#include <stdioh> nolist

#include <stdlibh> nolist

struct TAG {

int I;

long L;

TAL compiler view of register

stack at procedure return

Run-time view of register

stack at procedure return

Value

VST0302.vdd