101 lines
2.2 KiB
JavaScript
101 lines
2.2 KiB
JavaScript
|
/**
|
||
|
|
* @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';
|
||
|
|
|
||
|
|
// VARIABLES //
|
||
|
|
|
||
|
|
var M = 8;
|
||
|
|
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Copies values from `x` into `y`.
|
||
|
|
*
|
||
|
|
* @param {PositiveInteger} N - number of values to copy
|
||
|
|
* @param {Float64Array} x - input array
|
||
|
|
* @param {integer} strideX - `x` stride length
|
||
|
|
* @param {NonNegativeInteger} offsetX - starting `x` index
|
||
|
|
* @param {Float64Array} y - destination array
|
||
|
|
* @param {integer} strideY - `y` stride length
|
||
|
|
* @param {NonNegativeInteger} offsetY - starting `y` index
|
||
|
|
* @returns {Float64Array} `y`
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var Float64Array = require( '@stdlib/array/float64' );
|
||
|
|
*
|
||
|
|
* var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
|
||
|
|
* var y = new Float64Array( [ 6.0, 7.0, 8.0, 9.0, 10.0 ] );
|
||
|
|
*
|
||
|
|
* dcopy( x.length, x, 1, 0, y, 1, 0 );
|
||
|
|
* // y => <Float64Array>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]
|
||
|
|
*/
|
||
|
|
function dcopy( N, x, strideX, offsetX, y, strideY, offsetY ) {
|
||
|
|
var ix;
|
||
|
|
var iy;
|
||
|
|
var m;
|
||
|
|
var i;
|
||
|
|
if ( N <= 0 ) {
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
ix = offsetX;
|
||
|
|
iy = offsetY;
|
||
|
|
|
||
|
|
// 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[ iy ] = x[ ix ];
|
||
|
|
ix += strideX;
|
||
|
|
iy += strideY;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ( N < M ) {
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
for ( i = m; i < N; i += M ) {
|
||
|
|
y[ iy ] = x[ ix ];
|
||
|
|
y[ iy+1 ] = x[ ix+1 ];
|
||
|
|
y[ iy+2 ] = x[ ix+2 ];
|
||
|
|
y[ iy+3 ] = x[ ix+3 ];
|
||
|
|
y[ iy+4 ] = x[ ix+4 ];
|
||
|
|
y[ iy+5 ] = x[ ix+5 ];
|
||
|
|
y[ iy+6 ] = x[ ix+6 ];
|
||
|
|
y[ iy+7 ] = x[ ix+7 ];
|
||
|
|
ix += M;
|
||
|
|
iy += M;
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
for ( i = 0; i < N; i++ ) {
|
||
|
|
y[ iy ] = x[ ix ];
|
||
|
|
ix += strideX;
|
||
|
|
iy += strideY;
|
||
|
|
}
|
||
|
|
return y;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = dcopy;
|