@extra-integer/prev-pow2 v2.0.41

Gets previous power-of-2. :running: :package: :ledger:

Similar: log2, pow2, isPow2, nextPow2, prevPow2. This is part of package extra-integer.

integer.prevPow2(x);
// x: an int32

const integer = require('extra-integer');

integer.prevPow2(63);
// 32

integer.prevPow2(128);
// 128

integer.prevPow2(1);
// 1

references

• Bit-shift method: Bit Twiddling Hacks
• bit-twiddle: @mikolalysenko