unsigned long size = 256*1024*1024;
unsigned long stride = 256;
void *array = (void*)malloc(size);
for (unsigned long off = 0; off < size; off+=stride) {
    *(unsigned int*)(array+off) = off+stride;
}
*(unsigned int*)(array+off)=0;
int i=10000000;
struct timeval start, end;
gettimeofday(&start, NULL);
while (i>=1) {
    offset = *(unsigned int*)(array+off);
    i--;
}
gettimeofday(&end, NULL);
*(volatile unsigned int*)(array+offset);
printf("%.2fn", (end.tv_sec-start.tv_sec)*1000000+(end.tv_usec-start.tv_usec));

unsigned long size = 256*1024*1024;
unsigned long stride = 256;
void *array = (void*)malloc(size);
for (unsigned long off = 0; off < size; off+=stride) {
    *(unsigned int*)(array+off) = off+stride;
}
*(unsigned int*)(array+off)=0;
int i=10000000;
struct timeval start, end;
gettimeofday(&start, NULL);
#define ONE offset = *(unsigned int*)(array+off);
#define FIVE ONE ONE ONE ONE ONE
#define TEN FIVE FIVE
#define FIFTY TEN TEN TEN TEN TEN
#define HUNDRED FIFTY FIFTY
while (i>=1000) {
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    HUNDRED
    i-=1000;
}
gettimeofday(&end, NULL);
*(volatile unsigned int*)(array+offset);
printf("%.2fn", (end.tv_sec-start.tv_sec)*1000000+(end.tv_usec-start.tv_usec));