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Function core.bitop.bsr
Scans the bits in v from the most significant bit
to the least significant bit, looking
for the first set bit.
Prototype
int bsr( ulong v ) pure nothrow @nogc @safe;
Returns
The bit number of the first bit set.
The return value is undefined if v is zero.
Example
assert(bsr(0x21) == 5);
Authors
Don Clugston, Sean Kelly, Walter Bright, Alex Rønne Petersen