@extra-integer/sign-extend v2.0.0

Sign extends to 32-bit integer.

This is part of package extra-integer.

integer.signExtend(x, n);
// x: variable bit-width integer
// n: bit width

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

integer.signExtend(15, 4);
// -1

integer.signExtend(3, 3);
// 3

integer.signExtend(4, 3);
// -4

references

• Bit Twiddling Hacks: By Sean Eron Anderson