C166: Error 167 (Declaration/Activation Error) for _mmov_ Intrinsic

Information in this article applies to:

• C166

SYMPTOMS

I have written the following code to call the intrinsic _mmov_ function in order to use the ST10 MAC unit:

#include

void GetRasters(unsigned int near *pfont, unsigned int near *pCharcell, unsigned int Height)
{
  _mmov_((void near *)pCharcell,(void near *) pfont, Height);
}

I get the following error:

*** ERROR 167 .\STD.C: intrinsic '_mmov_': declaration/activation error

CAUSE

There are a couple of restrictions on the mmov instruction:

• The parameters need to be pointers to word aligned elemements (typically int)
• The count parameter needs to be a constant

RESOLUTION

Here are the two ways the _mmov_ function may be called:

#include
#include

void main(void)
{
  unsigned int *s, *p;

  _mmov_(s, p, 2);
  while(1);
}

void GetRasters(unsigned int near *pfont, unsigned int near *pCharcell, unsigned int Height)  {
  _mmov_((void near *)pCharcell,(void near *) pfont, 10);
}

MORE INFORMATION

• Refer to C166: MAC UNIT SUPPORT

SEE ALSO

• Refer to C166: Multiply-Accumulate (MAC) Unit Support

Last Reviewed: Thursday, February 25, 2021