feat: add constants/float16/sign-mask

lib/node_modules/@stdlib/constants/float16/sign-mask/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# FLOAT16_SIGN_MASK
+
+> Mask for the sign bit of a [half-precision floating-point number][ieee754].
+
+<section class="usage">
+
+## Usage
+
+<!-- eslint-disable id-length -->
+
+```javascript
+var FLOAT16_SIGN_MASK = require( '@stdlib/constants/float16/sign-mask' );
+```
+
+#### FLOAT16_SIGN_MASK
+
+Mask for the sign bit of a [half-precision floating-point number][ieee754].
+
+<!-- eslint-disable id-length -->
+
+```javascript
+// 0x8000 = 32768 => 1 00000 0000000000
+var bool = ( FLOAT16_SIGN_MASK === 0x8000 );
+// returns true
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   The higher order word of a [half-precision floating-point number][ieee754] is a 16-bit integer containing the more significant bits which include the exponent and sign.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint-disable id-length -->
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var toWord = require( '@stdlib/number/float16/base/to-word' );
+var fromWord = require( '@stdlib/number/float16/base/from-word' );
+var FLOAT16_SIGN_MASK = require( '@stdlib/constants/float16/sign-mask' );
+
+var x = -11.5;
+var w = toWord( x ); // 1 10010 0111000000
+// returns 51648
+
+// Mask off all bits except for the sign bit:
+var out = (w & FLOAT16_SIGN_MASK)>>>0; // 1 00000 0000000000
+// returns 32768
+
+// Turn off the sign bit and leave other bits unchanged:
+out = w & (~FLOAT16_SIGN_MASK); // 0 10010 0111000000
+// returns 18880
+
+// Generate a new value:
+out = fromWord( out );
+// returns 11.5
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/constants/float16/sign_mask.h"
+```
+
+#### STDLIB_CONSTANT_FLOAT16_SIGN_MASK
+
+Macro for the mask for the sign bit of a [half-precision floating-point number][ieee754].
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- 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">
+
+[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/constants/float16/sign-mask/docs/repl.txt

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+
+{{alias}}
+    Mask for the sign bit of a half-precision floating-point number.
+
+    Examples
+    --------
+    > {{alias}}
+    32768
+    > {{alias:@stdlib/number/uint16/base/to-binary-string}}( {{alias}} )
+    '1000000000000000'
+
+    See Also
+    --------
+

lib/node_modules/@stdlib/constants/float16/sign-mask/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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
+
+/**
+* Mask for the sign bit of a half-precision floating-point number.
+*
+* @example
+* var mask = FLOAT16_SIGN_MASK;
+* // returns 32768
+*/
+declare const FLOAT16_SIGN_MASK: number;
+
+
+// EXPORTS //
+
+export = FLOAT16_SIGN_MASK;

lib/node_modules/@stdlib/constants/float16/sign-mask/docs/types/test.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 FLOAT16_SIGN_MASK = require( './index' );
+
+
+// TESTS //
+
+// The export is a number...
+{
+	// eslint-disable-next-line @typescript-eslint/no-unused-expressions
+	FLOAT16_SIGN_MASK; // $ExpectType number
+}

lib/node_modules/@stdlib/constants/float16/sign-mask/examples/index.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 toWord = require( '@stdlib/number/float16/base/to-word' );
+var fromWord = require( '@stdlib/number/float16/base/from-word' );
+var toBinaryString = require( '@stdlib/number/uint16/base/to-binary-string' );
+var FLOAT16_SIGN_MASK = require( './../lib' );
+
+var x = -11.5;
+var w = toWord( x );
+console.log( 'Word: %s', toBinaryString( w ) );
+
+var out = (w & FLOAT16_SIGN_MASK)>>>0;
+console.log( 'Isolate sign bits: %s', toBinaryString( out ) );
+
+out = w & (~FLOAT16_SIGN_MASK);
+console.log( 'Turn off sign bits: %s', toBinaryString( out ) );
+
+out = fromWord( out );
+console.log( 'Value: %d', out );

lib/node_modules/@stdlib/constants/float16/sign-mask/include/stdlib/constants/float16/sign_mask.h

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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.
+*/
+
+#ifndef STDLIB_CONSTANTS_FLOAT16_SIGN_MASK_H
+#define STDLIB_CONSTANTS_FLOAT16_SIGN_MASK_H
+
+/**
+* Macro for the mask for the sign bit of a half-precision floating-point number.
+*/
+#define STDLIB_CONSTANT_FLOAT16_SIGN_MASK 0x8000
+
+#endif // !STDLIB_CONSTANTS_FLOAT16_SIGN_MASK_H

lib/node_modules/@stdlib/constants/float16/sign-mask/lib/index.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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';
+
+/**
+* Mask for the sign bit of a half-precision floating-point number.
+*
+* @module @stdlib/constants/float16/sign-mask
+* @type {uinteger16}
+*
+* @example
+* var FLOAT16_SIGN_MASK = require( '@stdlib/constants/float16/sign-mask' );
+* // returns 32768
+*/
+
+
+// MAIN //
+
+/**
+* Mask for the sign bit of a half-precision floating-point number.
+*
+* ## Notes
+*
+* The mask for the sign bit of a half-precision floating-point number is an unsigned 16-bit integer with the value \\( 32768 \\), which corresponds to the bit sequence
+*
+* ```binarystring
+* 1 00000 0000000000
+* ```
+*
+* @constant
+* @type {uinteger16}
+* @default 0x8000
+* @see [IEEE 754]{@link https://en.wikipedia.org/wiki/IEEE_754-1985}
+*/
+var FLOAT16_SIGN_MASK = 0x8000>>>0;
+
+
+// EXPORTS //
+
+module.exports = FLOAT16_SIGN_MASK;