Function Descriptions
3.39 Optimized Memory Copy
Description:
Header File:
FPU.h
Declaration:
This module performs optimized memory copies.
void memcpy_fast(void
*
dst, const void
*
src, Uint16 N)
Usage:
memcpy_fast(dst, src, N);
void* dst
pointer to destination
const void* src
pointer to source
Uint16 N
number of 16-bit words to copy
Alignment Requirements:
None
Notes:
1. The function checks for the case of N=0 and just returns if true.
Example:
#include "FPU.h"
#define N 256
float32 y[N];
float32 x[N];
main()
{
memcpy_fast(x, y, N<<1);
}
Benchmark Information:
Number of Cycles = 1 cycle per copy + 20 cycles of overhead (including the call and return).
This assumes src and dst are located in different internal RAM blocks.
Sep 10, 2012 73
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