diff options
Diffstat (limited to 'test/monniaux/bitfields')
-rw-r--r-- | test/monniaux/bitfields/bitfields.c | 36 | ||||
-rw-r--r-- | test/monniaux/bitfields/bitfields_long.c | 19 |
2 files changed, 55 insertions, 0 deletions
diff --git a/test/monniaux/bitfields/bitfields.c b/test/monniaux/bitfields/bitfields.c new file mode 100644 index 00000000..16ad5a61 --- /dev/null +++ b/test/monniaux/bitfields/bitfields.c @@ -0,0 +1,36 @@ +#include <stdio.h> + +struct fields { + unsigned f0 : 3; + unsigned f1 : 5; + signed f2 : 3; + unsigned toto1: 16; + unsigned toto2: 16; +}; + +unsigned get_toto1(struct fields x) { + return x.toto1; +} + +unsigned get_toto2(struct fields x) { + return x.toto2; +} + +int get_f1(struct fields x) { + return x.f1; +} + +int get_f2(struct fields x) { + return x.f2; +} + +void set_f1(struct fields *x, unsigned v) { + x->f1 = v; +} + +int main() { + struct fields x = {1, 2, -1}; + printf("%d %d\n", get_f1(x), get_f2(x)); + set_f1(&x, 4); + printf("%d %d\n", get_f1(x), get_f2(x)); +} diff --git a/test/monniaux/bitfields/bitfields_long.c b/test/monniaux/bitfields/bitfields_long.c new file mode 100644 index 00000000..93bba8d0 --- /dev/null +++ b/test/monniaux/bitfields/bitfields_long.c @@ -0,0 +1,19 @@ +#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)); +} |