feat: add number/int64/base/get-high-word

lib/node_modules/@stdlib/number/int64/base/get-high-word/README.md

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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.
+
+-->
+
+# High Word
+
+> Return a 32-bit unsigned integer corresponding to the high 32-bit word of a [64-bit signed integer][@stdlib/number/int64/ctor].
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var getHighWord = require( '@stdlib/number/int64/base/get-high-word' );
+```
+
+#### getHighWord( x )
+
+Returns a 32-bit unsigned integer corresponding to the high 32-bit word of a [64-bit signed integer][@stdlib/number/int64/ctor].
+
+```javascript
+var Int64 = require( '@stdlib/number/int64/ctor' );
+
+var x = new Int64( 4294967296 );
+var w = getHighWord( x );
+// returns 1
+```
+
+For negative values, the function returns the high word of the two's complement representation.
+
+```javascript
+var Int64 = require( '@stdlib/number/int64/ctor' );
+
+var x = new Int64( -1 );
+var w = getHighWord( x );
+// returns 4294967295
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var Int64 = require( '@stdlib/number/int64/ctor' );
+var getHighWord = require( '@stdlib/number/int64/base/get-high-word' );
+
+var x = new Int64( 4294967296 );
+console.log( getHighWord( x ) );
+// => 1
+
+x = new Int64( 0xffffffff );
+console.log( getHighWord( x ) );
+// => 0
+
+x = new Int64( 0x123400005678 );
+console.log( getHighWord( x ) );
+// => 4660
+
+x = new Int64( -1 );
+console.log( getHighWord( x ) );
+// => 4294967295
+
+x = new Int64( -1000000000000 );
+console.log( getHighWord( x ) );
+// => 4294967063
+
+x = Int64.of( 1234, 5678 );
+console.log( getHighWord( x ) );
+// => 1234
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[@stdlib/number/int64/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/number/int64/ctor
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/number/int64/base/get-high-word/benchmark/benchmark.js

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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 isnan = require( '@stdlib/assert/is-nan' ).isPrimitive;
+var bench = require( '@stdlib/bench' );
+var MAX_SAFE_INTEGER = require( '@stdlib/constants/float64/max-safe-integer' );
+var MIN_SAFE_INTEGER = require( '@stdlib/constants/float64/min-safe-integer' );
+var Int64 = require( '@stdlib/number/int64/ctor' );
+var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
+var pkg = require( './../package.json' ).name;
+var getHighWord = require( './../lib' );
+
+
+// VARIABLES //
+
+var rand = discreteUniform.factory( MIN_SAFE_INTEGER, MAX_SAFE_INTEGER );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var values;
+	var N;
+	var x;
+	var i;
+	var w;
+
+	N = 100;
+	values = [];
+	for ( i = 0; i < N; i++ ) {
+		values.push( new Int64( rand() ) );
+	}
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		x = values[ i % N ];
+		w = getHighWord( x );
+		if ( isnan( w ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( w ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/number/int64/base/get-high-word/docs/repl.txt

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+
+{{alias}}( x )
+    Returns a 32-bit unsigned integer corresponding to the high 32-bit word of a
+    64-bit signed integer.
+
+    Parameters
+    ----------
+    x: Int64
+        Input value.
+
+    Returns
+    -------
+    out: integer
+        Higher order word (32-bit unsigned integer).
+
+    Examples
+    --------
+    > var x = new {{alias:@stdlib/number/int64/ctor}}( 4294967296 )
+    <Int64>[ 4294967296n ]
+    > var w = {{alias}}( x )
+    1
+    > x = new {{alias:@stdlib/number/int64/ctor}}( -1 )
+    <Int64>[ -1n ]
+    > w = {{alias}}( x )
+    4294967295
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/number/int64/base/get-high-word/docs/types/index.d.ts

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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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { Int64 } from '@stdlib/types/number';
+
+/**
+* Returns a 32-bit unsigned integer corresponding to the high 32-bit word of a 64-bit signed integer.
+*
+* @param x - input value
+* @returns higher order word (32-bit unsigned integer)
+*
+* @example
+* var Int64 = require( '@stdlib/number/int64/ctor' );
+*
+* var x = new Int64( 4294967296 );
+* var w = getHighWord( x );
+* // returns 1
+*
+* @example
+* var Int64 = require( '@stdlib/number/int64/ctor' );
+*
+* var x = new Int64( -1 );
+* var w = getHighWord( x );
+* // returns 4294967295
+*/
+declare function getHighWord( x: Int64 ): number;
+
+
+// EXPORTS //
+
+export = getHighWord;

lib/node_modules/@stdlib/number/int64/base/get-high-word/docs/types/test.ts

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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.
+*/
+
+import Int64 = require( '@stdlib/number/int64/ctor' );
+import getHighWord = require( './index' );
+
+
+// TESTS //
+
+// The function returns a number...
+{
+	const x = new Int64( 5 );
+	getHighWord( x ); // $ExpectType number
+}
+
+// The compiler throws an error if the function is provided an argument that is not a 64-bit signed integer...
+{
+	getHighWord( 5 ); // $ExpectError
+	getHighWord( '5' ); // $ExpectError
+	getHighWord( true ); // $ExpectError
+	getHighWord( false ); // $ExpectError
+	getHighWord( [] ); // $ExpectError
+	getHighWord( {} ); // $ExpectError
+	getHighWord( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	const x = new Int64( 5 );
+	getHighWord(); // $ExpectError
+	getHighWord( x, x ); // $ExpectError
+}

lib/node_modules/@stdlib/number/int64/base/get-high-word/examples/index.js

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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';
+
+var Int64 = require( '@stdlib/number/int64/ctor' );
+var getHighWord = require( './../lib' );
+
+var x = new Int64( 4294967296 );
+console.log( getHighWord( x ) );
+// => 1
+
+x = new Int64( 0xffffffff );
+console.log( getHighWord( x ) );
+// => 0
+
+x = new Int64( 0x123400005678 );
+console.log( getHighWord( x ) );
+// => 4660
+
+x = new Int64( -1 );
+console.log( getHighWord( x ) );
+// => 4294967295
+
+x = new Int64( -1000000000000 );
+console.log( getHighWord( x ) );
+// => 4294967063
+
+x = Int64.of( 1234, 5678 );
+console.log( getHighWord( x ) );
+// => 1234