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rework pa_ulog2 and base it on __builtin_clz if available, make pa_make_power_of_two based on it

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This commit is contained in:
Lennart Poettering 2008-08-29 01:13:50 +02:00
parent bb8263be6f
commit 6723699ef8
1 changed files with 24 additions and 18 deletions
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42
src/pulsecore/core-util.h
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@ -142,29 +142,35 @@ static inline int pa_is_power_of_two(unsigned n) {
return !(n & (n - 1));
}
static inline unsigned pa_ulog2(unsigned n) {
if (n <= 1)
return 0;
#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
return 8U * (unsigned) sizeof(unsigned) - (unsigned) __builtin_clz(n) - 1;
#else
{
unsigned r = 0;
for (;;) {
n = n >> 1;
if (!n)
return r;
r++;
}
}
#endif
}
static inline unsigned pa_make_power_of_two(unsigned n) {
unsigned j = n;
if (pa_is_power_of_two(n))
return n;
while (j) {
j = j >> 1;
n = n | j;
}
return n + 1;
}
static inline unsigned pa_ulog2(unsigned n) {
unsigned r = 0;
while (n) {
r++;
n = n >> 1;
}
return r;
return 1U << (pa_ulog2(n) + 1);
}
void pa_close_pipe(int fds[2]);