time-to-botec

Benchmark sampling in different programming languages
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ndarray.js (2174B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // VARIABLES //
     22 
     23 var M = 8;
     24 
     25 
     26 // MAIN //
     27 
     28 /**
     29 * Copies values from `x` into `y`.
     30 *
     31 * @param {PositiveInteger} N - number of values to copy
     32 * @param {NumericArray} x - input array
     33 * @param {integer} strideX - `x` stride length
     34 * @param {NonNegativeInteger} offsetX - starting `x` index
     35 * @param {NumericArray} y - destination array
     36 * @param {integer} strideY - `y` stride length
     37 * @param {NonNegativeInteger} offsetY - starting `y` index
     38 * @returns {NumericArray} `y`
     39 *
     40 * @example
     41 * var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
     42 * var y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
     43 *
     44 * gcopy( x.length, x, 1, 0, y, 1, 0 );
     45 * // y => [ 1.0, 2.0, 3.0, 4.0, 5.0 ]
     46 */
     47 function gcopy( N, x, strideX, offsetX, y, strideY, offsetY ) {
     48 	var ix;
     49 	var iy;
     50 	var m;
     51 	var i;
     52 	if ( N <= 0 ) {
     53 		return y;
     54 	}
     55 	ix = offsetX;
     56 	iy = offsetY;
     57 
     58 	// Use unrolled loops if both strides are equal to `1`...
     59 	if ( strideX === 1 && strideY === 1 ) {
     60 		m = N % M;
     61 
     62 		// If we have a remainder, run a clean-up loop...
     63 		if ( m > 0 ) {
     64 			for ( i = 0; i < m; i++ ) {
     65 				y[ iy ] = x[ ix ];
     66 				ix += strideX;
     67 				iy += strideY;
     68 			}
     69 		}
     70 		if ( N < M ) {
     71 			return y;
     72 		}
     73 		for ( i = m; i < N; i += M ) {
     74 			y[ iy ] = x[ ix ];
     75 			y[ iy+1 ] = x[ ix+1 ];
     76 			y[ iy+2 ] = x[ ix+2 ];
     77 			y[ iy+3 ] = x[ ix+3 ];
     78 			y[ iy+4 ] = x[ ix+4 ];
     79 			y[ iy+5 ] = x[ ix+5 ];
     80 			y[ iy+6 ] = x[ ix+6 ];
     81 			y[ iy+7 ] = x[ ix+7 ];
     82 			ix += M;
     83 			iy += M;
     84 		}
     85 		return y;
     86 	}
     87 	for ( i = 0; i < N; i++ ) {
     88 		y[ iy ] = x[ ix ];
     89 		ix += strideX;
     90 		iy += strideY;
     91 	}
     92 	return y;
     93 }
     94 
     95 
     96 // EXPORTS //
     97 
     98 module.exports = gcopy;