diff options
Diffstat (limited to 'bisect.c')
| -rw-r--r-- | bisect.c | 42 |
1 files changed, 40 insertions, 2 deletions
@@ -525,9 +525,9 @@ struct commit_list *filter_skipped(struct commit_list *list, * is increased by one between each call, but that should not matter * for this application. */ -static int get_prn(int count) { +static unsigned get_prn(unsigned count) { count = count * 1103515245 + 12345; - return ((unsigned)(count/65536) % PRN_MODULO); + return (count/65536) % PRN_MODULO; } /* @@ -956,3 +956,41 @@ int bisect_next_all(const char *prefix, int no_checkout) return bisect_checkout(bisect_rev_hex, no_checkout); } +static inline int log2i(int n) +{ + int log2 = 0; + + for (; n > 1; n >>= 1) + log2++; + + return log2; +} + +static inline int exp2i(int n) +{ + return 1 << n; +} + +/* + * Estimate the number of bisect steps left (after the current step) + * + * For any x between 0 included and 2^n excluded, the probability for + * n - 1 steps left looks like: + * + * P(2^n + x) == (2^n - x) / (2^n + x) + * + * and P(2^n + x) < 0.5 means 2^n < 3x + */ +int estimate_bisect_steps(int all) +{ + int n, x, e; + + if (all < 3) + return 0; + + n = log2i(all); + e = exp2i(n); + x = all - e; + + return (e < 3 * x) ? n : n - 1; +} |