main.c (2477B)
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 #include "stdlib/ndarray/base/assert/is_single_segment_compatible.h" 20 #include "stdlib/ndarray/base/minmax_view_buffer_index.h" 21 #include "stdlib/ndarray/base/bytes_per_element.h" 22 #include "stdlib/ndarray/base/numel.h" 23 #include "stdlib/ndarray/dtypes.h" 24 #include <stdint.h> 25 26 /** 27 * Determines if an array is compatible with a single memory segment. 28 * 29 * ## Notes 30 * 31 * - The function returns `1` if compatible with a single memory segment and `0` otherwise. 32 * 33 * @param dtype data type 34 * @param ndims number of dimensions 35 * @param shape array shape (dimensions) 36 * @param strides array strides (in bytes) 37 * @param offset index offset 38 * @return value indicating if compatible with a single memory segment 39 * 40 * @example 41 * #include "stdlib/ndarray/base/assert/is_single_segment_compatible.h" 42 * #include "stdlib/ndarray/dtypes.h" 43 * 44 * int64_t ndims = 2; 45 * int64_t shape[] = { 10, 10 }; 46 * int64_t strides[] = { 10, 1 }; 47 * int64_t offset = 0; 48 * 49 * int8_t b = stdlib_ndarray_is_single_segment_compatible( STDLIB_NDARRAY_UINT8, ndims, shape, strides, offset ); 50 * // returns 1 51 */ 52 int8_t stdlib_ndarray_is_single_segment_compatible( enum STDLIB_NDARRAY_DTYPE dtype, int64_t ndims, int64_t *shape, int64_t *strides, int64_t offset ) { 53 int64_t tmp[2]; 54 int64_t nbytes; 55 int64_t len; 56 57 // Compute the total number of elements: 58 len = stdlib_ndarray_numel( ndims, shape ); 59 if ( len == 0 ) { 60 return 0; 61 } 62 // Determine the minimum and maximum linear indices which are accessible by the array view: 63 stdlib_ndarray_minmax_view_buffer_index( ndims, shape, strides, offset, tmp ); 64 65 // Determine the number of bytes per element: 66 nbytes = stdlib_ndarray_bytes_per_element( dtype ); 67 68 // If the number of elements matches the view size, then the array is single-segment compatible: 69 if ( (len*nbytes) == ( (tmp[1]-tmp[0])+nbytes ) ) { 70 return 1; 71 } 72 return 0; 73 }