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/**
* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
 
'use strict';
 
// MODULES //
 
var Uint32Array = require( '@stdlib/array/uint32' );
var toWords = require( '@stdlib/number/uint64/base/to-words' ).assign;
var Uint64 = require( '@stdlib/number/uint64/ctor' );
var assign = require( './assign.js' );
 
 
// VARIABLES //
 
var WORKSPACE = new Uint32Array( 4 );
 
 
// MAIN //
 
/**
* Performs bitwise shift to the right on a 64-bit unsigned integer.
*
* @param {Uint64} a - 64-bit unsigned integer
* @param {uinteger32} shift - number of bits to shift (0-63)
* @returns {Uint64} result
*
* @example
* var Uint64 = require( '@stdlib/number/uint64/ctor' );
*
* var a = new Uint64( 10 );
*
* var v = rightShift( a, 1 );
* // returns <Uint64>[ 5n ]
*/
function rightShift( a, shift ) {
	toWords( a, WORKSPACE, 1, 0 );
	assign( WORKSPACE[0], WORKSPACE[1], shift, WORKSPACE, 1, 2 );
	return Uint64.of( WORKSPACE[2], WORKSPACE[3] );
}
 
 
// EXPORTS //
 
module.exports = rightShift;