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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';
// VARIABLES //
// Shift mask: 0x3f => 00000000000000000000000000111111
var MAX_SHIFT = 63 >>> 0;
// MAIN //
/**
* Performs bitwise shift to the right on a 64-bit unsigned integer and assigns results to a provided output array.
*
* @param {uinteger32} ah - high 32-bit word of the 64-bit unsigned integer
* @param {uinteger32} al - low 32-bit word of the 64-bit unsigned integer
* @param {uinteger32} shift - number of bits to shift (0-63)
* @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( 2, 4, 1, new Uint32Array( 2 ), 1, 0 );
* // returns <Uint32Array>[ 1, 2 ]
*/
function assign( ah, al, shift, out, stride, offset ) {
ah >>>= 0;
al >>>= 0;
shift &= MAX_SHIFT;
if ( shift === 0 ) {
out[ offset ] = ah >>> 0;
out[ offset + stride ] = al >>> 0;
} else if ( shift < 32 ) {
out[ offset ] = ah >>> shift;
out[ offset + stride ] = ( ( al >>> shift ) | ( ah << ( 32 - shift ) ) ) >>> 0; // eslint-disable-line max-len
} else {
out[ offset ] = 0;
out[ offset + stride ] = ah >>> ( shift - 32 );
}
return out;
}
// EXPORTS //
module.exports = assign;
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