National-instruments AutoCode NI MATRIX Manuel d'utilisateur télécharger pdf (Page 165)

Chapter 6 Vectorized Code Generation

AutoCode Reference 6-2 ni.com

Scalar Gain Block Example

Example 6-1 shows the scalar code generated for a gain block.

Example 6-1 Scalar Code Generated for Gain Block Example

void subsys_1(U, Y)

struct _Sys_ExtIn *U;

struct _Subsys_1_out *Y;

{

static RT_INTEGER iinfo[4];

/******* Initialization. *******/

if (SUBSYS_PREINIT[1]) {

iinfo[0] = 0;

iinfo[1] = 1;

iinfo[2] = 1;

iinfo[3] = 1;

SUBSYS_PREINIT[1] = FALSE;

return;

}

/***** Output Update. *****/

/* ---------------------------- Gain Block */

/* {gain..2} */

Y->gain_2_1 = 1.2*U->gain_1;

Y->gain_2_2 = 2.3*U->gain_2;

Y->gain_2_3 = 3.4*U->gain_3;

Y->gain_2_4 = 4.5*U->gain_4;

Y->gain_2_5 = 5.6*U->gain_5;

Y->gain_2_6 = 6.7*U->gain_6;

Y->gain_2_7 = 7.8*U->gain_7;

Y->gain_2_8 = 8.9*U->gain_8;

Y->gain_2_9 = 9.1*U->gain_9;

Y->gain_2_10 = 10.11*U->gain_10;

The scalar code for the gain block should be familiar. Some characteristics

of the code for later comparison should be mentioned. First, this is the

canonical example of the concept of unrolling. The basic equation for a

gain block is:

Y(i) = GainParameter(i) * U(i)

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National-instruments AutoCode NI MATRIX Manuel d'utilisateur Page 165