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common: fix mp_round_next_power_of_2() 

Who write this dumb shit¹? It didn't handle 1<<31, and was unnecessarily
slow.

¹ it was me
This commit is contained in:
wm4 2020-04-10 13:10:18 +02:00
parent 40c8df8a54
commit e5d49f662e
1 changed files with 6 additions and 5 deletions
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11
common/common.c
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@ -344,9 +344,10 @@ unsigned int mp_log2(uint32_t v)
// mp_round_next_power_of_2(UINT32_MAX) == 0
uint32_t mp_round_next_power_of_2(uint32_t v)
{
for (int n = 0; n < 30; n++) {
if ((1 << n) >= v)
return 1 << n;
}
return 0;
if (!v)
return 1;
if (!(v & (v - 1)))
return v;
int l = mp_log2(v) + 1;
return l == 32 ? 0 : (uint32_t)1 << l;
}