Function glm::builtin::findMSB

pub fn findMSB<B: BaseInt, I: GenIType, T: IntIntRel<B, I>>(value: T) -> I

Returns the bit number of the most significant bit in the binary representation of value.

For positive integers, the result will be the bit number of the most significant bit set to 1.

For negative integers, the result will be the bit number of the most significant bit set to 0. For a value of zero or negative one, -1 will be returned.

Example

use glm::{ findMSB, ivec3 };

assert_eq!(findMSB(0_i32), -1);
assert_eq!(findMSB(ivec3(-1, -2, 0x7FFFFFFF)), ivec3(-1, 0, 30));