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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 floor = require( '@stdlib/math/base/special/floor' );
var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var accessors = require( './accessors.js' );
// VARIABLES //
var M = 3;
// MAIN //
/**
* Reverses a strided array in-place according to a mask using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {NumericArray} x - input array
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {NumericArray} mask - mask array
* @param {integer} strideMask - stride length for `mask`
* @param {NonNegativeInteger} offsetMask - starting index for `mask`
* @returns {NumericArray} input array
*
* @example
* var x = [ -2.0, 1.0, 3.0, -5.0, 4.0, 0.0, -1.0, -3.0 ];
* var mask = [ 0, 0, 0, 1, 0, 0, 0, 0 ];
*
* gmskrev( x.length, x, 1, 0, mask, 1, 0 );
* // x => [ -3.0, -1.0, 0.0, -5.0, 4.0, 3.0, 1.0, -2.0 ]
*/
function gmskrev( N, x, strideX, offsetX, mask, strideMask, offsetMask ) {
var tmp;
var ix;
var iy;
var im;
var jm;
var o;
var m;
var n;
var i;
if ( N <= 0 ) {
return x;
}
o = arraylike2object( x );
if ( o.accessorProtocol ) {
accessors( N, o, strideX, offsetX, arraylike2object( mask ), strideMask, offsetMask ); // eslint-disable-line max-len
return o.data;
}
n = floor( N/2 );
ix = offsetX;
im = offsetMask;
// Use loop unrolling if the strides are equal to `1`...
if ( strideX === 1 && strideMask === 1 ) {
m = n % M;
iy = ix + N - 1;
jm = im + N - 1;
// If we have a remainder, run a clean-up loop...
if ( m > 0 ) {
for ( i = 0; i < m; i++ ) {
if ( mask[ im ] === 0 && mask[ jm ] === 0 ) {
tmp = x[ ix ];
x[ ix ] = x[ iy ];
x[ iy ] = tmp;
}
ix += 1;
im += 1;
iy -= 1;
jm -= 1;
}
}
if ( n < M ) {
return x;
}
for ( i = m; i < n; i += M ) {
if ( mask[ im ] === 0 && mask[ jm ] === 0 ) {
tmp = x[ ix ];
x[ ix ] = x[ iy ];
x[ iy ] = tmp;
}
if ( mask[ im+1 ] === 0 && mask[ jm-1 ] === 0 ) {
tmp = x[ ix+1 ];
x[ ix+1 ] = x[ iy-1 ];
x[ iy-1 ] = tmp;
}
if ( mask[ im+2 ] === 0 && mask[ jm-2 ] === 0 ) {
tmp = x[ ix+2 ];
x[ ix+2 ] = x[ iy-2 ];
x[ iy-2 ] = tmp;
}
ix += M;
im += M;
iy -= M;
jm -= M;
}
return x;
}
iy = ix + ( (N-1) * strideX );
jm = im + ( (N-1) * strideMask );
for ( i = 0; i < n; i++ ) {
if ( mask[ im ] === 0 && mask[ jm ] === 0 ) {
tmp = x[ ix ];
x[ ix ] = x[ iy ];
x[ iy ] = tmp;
}
ix += strideX;
im += strideMask;
iy -= strideX;
jm -= strideMask;
}
return x;
}
// EXPORTS //
module.exports = gmskrev;
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