Bitwise Rotation

Bitwise rotation to the right.

Usage

var rotr32 = require( '@stdlib/math/base/utils/uint32-rotr32' );

rotr32( x, shift )

Performs a bitwise rotation to the right.

var toBinaryStringUint32 = require( '@stdlib/math/base/utils/uint32-to-binary-string' );

var x = 2147483649;
var bstr = toBinaryStringUint32( x );
// returns '10000000000000000000000000000001'

var y = rotr32( x, 10 );
// returns 6291456

bstr = toBinaryStringUint32( y );
// returns '00000000011000000000000000000000'

Notes

• If provided a shift equal to 0, the function returns the input value.

  var y = rotr32( 3, 0 );
  // returns 3

• If provided a shift greater than 31, the function performs a bitwise rotation based on the 5 least significant bits of shift (i.e., shift % 32).

  var shift = 34; // 00000000000000000000000000100010
  
  var y = rotr( 1, shift ); // 01000000000000000000000000000000
  // returns 1073741824

Examples

var toBinaryStringUint32 = require( '@stdlib/math/base/utils/uint32-to-binary-string' );
var MAX_INT = require( '@stdlib/math/constants/uint32-max' );
var rotr32 = require( '@stdlib/math/base/utils/uint32-rotr' );

var HALF;
var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = i;
    y = rotr32( x, 10 );
    console.log( '%d => %s => %s => %d', x, toBinaryStringUint32( x ), toBinaryStringUint32( y ), y );
}

HALF = (MAX_INT+1) / 2;
for ( i = 0; i < 100; i++ ) {
    x = HALF + i;
    y = rotr32( x, 10 );
    console.log( '%d => %s => %s => %d', x, toBinaryStringUint32( x ), toBinaryStringUint32( y ), y );
}