1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
#include <stdio.h>
#include <stdint.h>
#define GET_FIELD_L(x, stop, start) (((x) << (63-(stop))) >> (63-(stop)+(start)))
#define FIELD_MASK(stop, start) ((1ULL<<(stop)) - (1ULL<<(start)) + (1ULL<<(stop)))
#define SET_FIELD_L(x, stop, start, y) (((x) & ~FIELD_MASK(stop, start)) | ((y << start) & FIELD_MASK(stop, start)))
uint64_t get_f2(uint64_t x) {
return GET_FIELD_L(x, 47, 16);
}
uint64_t set_f2(uint64_t x, uint64_t y) {
return SET_FIELD_L(x, 47, 16, y);
}
int main() {
printf("%lx %lx\n", FIELD_MASK(47, 16), set_f2(0x12345678ABCD1234ULL, 0x11112222ULL));
}
|
