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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 umul = require( '@stdlib/number/uint32/base/mul' );
var umuldw = require( '@stdlib/number/uint32/base/muldw' ).assign;
// MAIN //
/**
* Multiplies two 64-bit unsigned integers and assigns results to a provided output array.
*
* @param {uinteger} ah - high 32-bit word of the first 64-bit unsigned integer
* @param {uinteger} al - low 32-bit word of the first 64-bit unsigned integer
* @param {uinteger} bh - high 32-bit word of the second 64-bit unsigned integer
* @param {uinteger} bl - low 32-bit word of the second 64-bit unsigned integer
* @param {Collection} out - output array
* @param {integer} stride - stride length
* @param {NonNegativeInteger} offset - starting index
* @returns {Collection} output array
*
* @example
* var Uint32Array = require( '@stdlib/array/uint32' );
*
* var out = assign( 1, 2, 3, 4, new Uint32Array( 2 ), 1, 0 );
* // returns <Uint32Array>[ 10, 8 ]
*/
function assign( ah, al, bh, bl, out, stride, offset ) {
ah >>>= 0;
al >>>= 0;
bh >>>= 0;
bl >>>= 0;
umuldw( al, bl, out, stride, offset ); // calculates the low 32-bit word of the product and part of high 32-bit word
out[ offset ] = ( out[ offset ] + umul( ah, bl ) + umul( al, bh ) ) >>> 0; // completes the high 32-bit of the product
return out;
}
// EXPORTS //
module.exports = assign;
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