MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

__builtin_dmaoffset
Built-in Functions
Description: Obtains the offset of a symbol within DMA memory.
For example:
unsigned int result;
char buffer[256] __attribute__((space(dma)));
result = __builtin_dmaoffset(&buffer);
Prototype:
Might generate:
mov #dmaoffset(buffer), w0
unsigned int __builtin_dmaoffset(const void *p);
Argument: *p pointer to DMA address value
Return Value: Returns the offset to a variable located in DMA memory.
Assembler Operator
/ Machine
Instruction:
dmaoffset
Error Messages An error message will be displayed if the parameter is not the address
of a global symbol.
__builtin_ed
Description: Squares sqr, returning it as the result. Also prefetchs 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:
register int result asm("A");
int *xmemory, *ymemory;
int distance;
result = __builtin_ed(distance,
&xmemory, 2,
&ymemory, 2,
&distance);
Prototype:
might generate:
ed w4*w4, A, [w8]+=2, [W10]+=2, w4
int __builtin_ed(int sqr, int **xptr, int xincr,
int **yptr, int yincr, int *distance);
Argument: 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 an accumulator.
Assembler Operator
/ Machine
Instruction:
ed
© 2008 Microchip Technology Inc. DS51284G-page 147