Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2018 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 arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var accessors = require( './accessors.js' );
// VARIABLES //
var M = 8;
// MAIN //
/**
* Copies values from `x` into `y`.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Collection} x - input array
* @param {integer} strideX - `x` stride length
* @param {Collection} y - output array
* @param {integer} strideY - `y` stride length
* @returns {Collection} output array
*
* @example
* var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
* var y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
*
* gcopy( x.length, x, 1, y, 1 );
* // y => [ 1.0, 2.0, 3.0, 4.0, 5.0 ]
*/
function gcopy( N, x, strideX, y, strideY ) {
var ix;
var iy;
var ox;
var oy;
var m;
var i;
if ( N <= 0 ) {
return y;
}
ox = arraylike2object( x );
oy = arraylike2object( y );
if ( ox.accessorProtocol || oy.accessorProtocol ) {
if ( strideX < 0 ) {
ix = (1-N) * strideX;
} else {
ix = 0;
}
if ( strideY < 0 ) {
iy = (1-N) * strideY;
} else {
iy = 0;
}
accessors( N, ox, strideX, ix, oy, strideY, iy );
return oy.data;
}
// Use unrolled loops if both strides are equal to `1`...
if ( strideX === 1 && strideY === 1 ) {
m = N % M;
// If we have a remainder, run a clean-up loop...
if ( m > 0 ) {
for ( i = 0; i < m; i++ ) {
y[ i ] = x[ i ];
}
}
if ( N < M ) {
return y;
}
for ( i = m; i < N; i += M ) {
y[ i ] = x[ i ];
y[ i+1 ] = x[ i+1 ];
y[ i+2 ] = x[ i+2 ];
y[ i+3 ] = x[ i+3 ];
y[ i+4 ] = x[ i+4 ];
y[ i+5 ] = x[ i+5 ];
y[ i+6 ] = x[ i+6 ];
y[ i+7 ] = x[ i+7 ];
}
return y;
}
if ( strideX < 0 ) {
ix = (1-N) * strideX;
} else {
ix = 0;
}
if ( strideY < 0 ) {
iy = (1-N) * strideY;
} else {
iy = 0;
}
for ( i = 0; i < N; i++ ) {
y[ iy ] = x[ ix ];
ix += strideX;
iy += strideY;
}
return y;
}
// EXPORTS //
module.exports = gcopy;
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