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util: Add util_unsigned_logbase2.

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Cherry picked from Keith's commit f911c3b989.
This commit is contained in:
José Fonseca 2009-08-29 09:15:10 +01:00
parent c40eddd294
commit fdb3e75f7e
1 changed files with 12 additions and 0 deletions
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12
src/gallium/auxiliary/util/u_math.h
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@ -375,6 +375,18 @@ unsigned ffs( unsigned u )
#endif
/* Could also binary search for the highest bit.
*/
static INLINE unsigned
util_unsigned_logbase2(unsigned n)
{
unsigned log2 = 0;
while (n >>= 1)
++log2;
return log2;
}
/**
* Return float bits.
*/