tmk
11 years ago
2 changed files with 11 additions and 2 deletions
+ 9
- 1
common/util.c
View File
| @@ -22,7 +22,7 @@ uint8_t bitpop(uint8_t bits) | |||
| { | |||
| uint8_t c; | |||
| for (c = 0; bits; c++) | |||
| bits &= bits -1; | |||
| bits &= bits - 1; | |||
| return c; | |||
| /* | |||
| const uint8_t bit_count[] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 }; | |||
| @@ -30,6 +30,14 @@ uint8_t bitpop(uint8_t bits) | |||
| */ | |||
| } | |||
| uint8_t bitpop16(uint16_t bits) | |||
| { | |||
| uint8_t c; | |||
| for (c = 0; bits; c++) | |||
| bits &= bits - 1; | |||
| return c; | |||
| } | |||
| // most significant on-bit - return highest location of on-bit | |||
| uint8_t biton(uint8_t bits) | |||
| { | |||
+ 2
- 1
common/util.h
View File
| @@ -16,7 +16,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
| */ | |||
| #ifndef UTIL_H | |||
| #define UTIL_H 1 | |||
| #define UTIL_H | |||
| #include <stdint.h> | |||
| @@ -29,6 +29,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
| uint8_t bitpop(uint8_t bits); | |||
| uint8_t bitpop16(uint16_t bits); | |||
| uint8_t biton(uint8_t bits); | |||
| #endif | |||
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