28.2.83 __builtin_movsac

Architecture

dsPIC33C/E/F, dsPIC30

Description

xptr may be null to signify no X prefetch to be performed, in which case the values of xincr and xval are ignored, but required.

yptr may be null to signify no Y prefetch to be performed, in which case the values of yincr and yval are ignored, but required.

xval and yval nominate the address of a C variable where the prefetched value will be stored.

xincr and yincr may be the literal values: -6, -4, -2, 0, 2, 4, 6 or an integer value.

If AWB is non null, the other accumulator will be written back into the referenced variable.

For example:

 volatile register int16_t result asm("A");
 int16_t *xmemory;
 int16_t *ymemory;
 int16_t xVal, yVal;

 __builtin_movsac(&xmemory, &xVal, 2, &ymemory, &yVal, 2, 0, 0);

might generate:

 movsac A, [w8]+=2, w4, [w10]+=2, w5

Prototype

void __builtin_movsac(
 int16_t **xptr, int16_t *xval, int16_t xincr,
 int16_t **yptr, int16_t *yval, int16_t yincr, int16_t *AWB,
 int16_t AWB_accum);

Arguments

xptr – Integer pointer to pointer to x prefetch.

xval – Integer pointer to value of x prefetch.

xincr – Integer increment value of x prefetch.

yptr – Integer pointer to pointer to y prefetch.

yval – Integer pointer to value of y prefetch.

yincr – Integer increment value of y prefetch.

AWB – Accumulator write back location.

AWB_accum – Accumulator to write back.

Return Value

None

Machine Instruction