28.2.20 __builtin_edac

Description

Squares sqr and sums with the nominated accumulator register, returning it as the result. Also prefetches data for future square operation by computing **xptr - **yptr and storing the result in *distance.

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

For example:

 volatile register int result asm("A");
 int *xmemory, *ymemory;
 int distance;

 result = __builtin_ed(result, distance,
                       &xmemory, 2,
                       &ymemory, 2,
                       &distance);

might generate:

edac w4*w4, A, [w8]+=2, [W10]+=2, w4

Prototype

int __builtin_edac(int Accum, int sqr,
  int **xptr, int xincr, int **yptr, int yincr,
  int *distance);

Argument

Accum – Accumulator to sum.

sqr – Integer squared value.

xptr – Integer pointer to pointer to x prefetch.

xincr – Integer increment value of x prefetch.

yptr – Integer pointer to pointer to y prefetch.

yincr – Integer increment value of y prefetch.

distance – Integer pointer to distance.

Return Value

Returns the squared result to specified accumulator.

Assembler Operator/ Machine Instruction

edac

Error Messages