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) 2023 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.
*/
/* eslint-disable max-depth */
'use strict';
// MODULES //
var loopOrder = require( '@stdlib/ndarray/base/nullary-loop-interchange-order' );
var blockSize = require( '@stdlib/ndarray/base/nullary-tiling-block-size' );
// MAIN //
/**
* Applies a nullary callback and assigns results to elements in an output ndarray via loop blocking.
*
* @private
* @param {Object} x - object containing ndarray meta data
* @param {string} x.dtype - data type
* @param {Collection} x.data - data buffer
* @param {NonNegativeIntegerArray} x.shape - dimensions
* @param {IntegerArray} x.strides - stride lengths
* @param {NonNegativeInteger} x.offset - index offset
* @param {string} x.order - specifies whether `x` is row-major (C-style) or column-major (Fortran-style)
* @param {Callback} fcn - nullary callback
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
*
* function fcn() {
* return 10.0;
* }
*
* // Create a data buffer:
* var xbuf = new Float64Array( 12 );
*
* // Define the shape of the output array:
* var shape = [ 1, 3, 1, 2 ];
*
* // Define the array strides:
* var sx = [ 12, 4, 4, 1 ];
*
* // Define the index offset:
* var ox = 1;
*
* // Create the output ndarray-like object:
* var x = {
* 'dtype': 'float64',
* 'data': xbuf,
* 'shape': shape,
* 'strides': sx,
* 'offset': ox,
* 'order': 'row-major'
* };
*
* // Apply the nullary function:
* blockednullary4d( x, fcn );
*
* console.log( x.data );
* // => <Float64Array>[ 0.0, 10.0, 10.0, 0.0, 0.0, 10.0, 10.0, 0.0, 0.0, 10.0, 10.0, 0.0 ]
*/
function blockednullary4d( x, fcn ) {
var bsize;
var xbuf;
var dx0;
var dx1;
var dx2;
var dx3;
var ox1;
var ox2;
var ox3;
var sh;
var s0;
var s1;
var s2;
var s3;
var sx;
var ox;
var ix;
var i0;
var i1;
var i2;
var i3;
var j0;
var j1;
var j2;
var j3;
var o;
// Note on variable naming convention: s#, dx#, dy#, i#, j# where # corresponds to the loop number, with `0` being the innermost loop...
// Resolve the loop interchange order:
o = loopOrder( x.shape, x.strides );
sh = o.sh;
sx = o.sx;
// Determine the block size:
bsize = blockSize( x.dtype );
// Set a pointer to the first indexed element:
ox = x.offset;
// Cache a reference to the output ndarray buffer:
xbuf = x.data;
// Cache the offset increment for the innermost loop:
dx0 = sx[0];
// Iterate over blocks...
for ( j3 = sh[3]; j3 > 0; ) {
if ( j3 < bsize ) {
s3 = j3;
j3 = 0;
} else {
s3 = bsize;
j3 -= bsize;
}
ox3 = ox + ( j3*sx[3] );
for ( j2 = sh[2]; j2 > 0; ) {
if ( j2 < bsize ) {
s2 = j2;
j2 = 0;
} else {
s2 = bsize;
j2 -= bsize;
}
dx3 = sx[3] - ( s2*sx[2] );
ox2 = ox3 + ( j2*sx[2] );
for ( j1 = sh[1]; j1 > 0; ) {
if ( j1 < bsize ) {
s1 = j1;
j1 = 0;
} else {
s1 = bsize;
j1 -= bsize;
}
dx2 = sx[2] - ( s1*sx[1] );
ox1 = ox2 + ( j1*sx[1] );
for ( j0 = sh[0]; j0 > 0; ) {
if ( j0 < bsize ) {
s0 = j0;
j0 = 0;
} else {
s0 = bsize;
j0 -= bsize;
}
// Compute the index offset for the first output ndarray element in the current block:
ix = ox1 + ( j0*sx[0] );
// Compute the loop offset increment:
dx1 = sx[1] - ( s0*sx[0] );
// Iterate over the ndarray dimensions...
for ( i3 = 0; i3 < s3; i3++ ) {
for ( i2 = 0; i2 < s2; i2++ ) {
for ( i1 = 0; i1 < s1; i1++ ) {
for ( i0 = 0; i0 < s0; i0++ ) {
xbuf[ ix ] = fcn();
ix += dx0;
}
ix += dx1;
}
ix += dx2;
}
ix += dx3;
}
}
}
}
}
}
// EXPORTS //
module.exports = blockednullary4d;
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