time-to-botec

Benchmark sampling in different programming languages
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addon.cpp (3595B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2020 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/stats/base/dmeankbn.h"
     20 #include <node_api.h>
     21 #include <stdint.h>
     22 #include <stdlib.h>
     23 #include <stdbool.h>
     24 #include <assert.h>
     25 
     26 /**
     27 * Add-on namespace.
     28 */
     29 namespace stdlib_stats_base_dmeankbn {
     30 
     31 	/**
     32 	* Computes the arithmetic mean of a double-precision floating-point strided array using an improved Kahan–Babuška algorithm.
     33 	*
     34 	* ## Notes
     35 	*
     36 	* -   When called from JavaScript, the function expects three arguments:
     37 	*
     38 	*     -   `N`: number of indexed elements
     39 	*     -   `X`: input array
     40 	*     -   `stride`: stride length
     41 	*/
     42 	napi_value node_dmeankbn( napi_env env, napi_callback_info info ) {
     43 		napi_status status;
     44 
     45 		size_t argc = 3;
     46 		napi_value argv[ 3 ];
     47 		status = napi_get_cb_info( env, info, &argc, argv, nullptr, nullptr );
     48 		assert( status == napi_ok );
     49 
     50 		if ( argc < 3 ) {
     51 			napi_throw_error( env, nullptr, "invalid invocation. Must provide 3 arguments." );
     52 			return nullptr;
     53 		}
     54 
     55 		napi_valuetype vtype0;
     56 		status = napi_typeof( env, argv[ 0 ], &vtype0 );
     57 		assert( status == napi_ok );
     58 		if ( vtype0 != napi_number ) {
     59 			napi_throw_type_error( env, nullptr, "invalid argument. First argument must be a number." );
     60 			return nullptr;
     61 		}
     62 
     63 		bool res;
     64 		status = napi_is_typedarray( env, argv[ 1 ], &res );
     65 		assert( status == napi_ok );
     66 		if ( res == false ) {
     67 			napi_throw_type_error( env, nullptr, "invalid argument. Second argument must be a Float64Array." );
     68 			return nullptr;
     69 		}
     70 
     71 		napi_valuetype vtype2;
     72 		status = napi_typeof( env, argv[ 2 ], &vtype2 );
     73 		assert( status == napi_ok );
     74 		if ( vtype2 != napi_number ) {
     75 			napi_throw_type_error( env, nullptr, "invalid argument. Third argument must be a number." );
     76 			return nullptr;
     77 		}
     78 
     79 		int64_t N;
     80 		status = napi_get_value_int64( env, argv[ 0 ], &N );
     81 		assert( status == napi_ok );
     82 
     83 		int64_t stride;
     84 		status = napi_get_value_int64( env, argv[ 2 ], &stride );
     85 		assert( status == napi_ok );
     86 
     87 		napi_typedarray_type vtype1;
     88 		size_t xlen;
     89 		void *X;
     90 		status = napi_get_typedarray_info( env, argv[ 1 ], &vtype1, &xlen, &X, nullptr, nullptr );
     91 		assert( status == napi_ok );
     92 		if ( vtype1 != napi_float64_array ) {
     93 			napi_throw_type_error( env, nullptr, "invalid argument. Second argument must be a Float64Array." );
     94 			return nullptr;
     95 		}
     96 		if ( (N-1)*llabs(stride) >= (int64_t)xlen ) {
     97 			napi_throw_range_error( env, nullptr, "invalid argument. Second argument has insufficient elements based on the associated stride and the number of indexed elements." );
     98 			return nullptr;
     99 		}
    100 
    101 		napi_value v;
    102 		status = napi_create_double( env, stdlib_strided_dmeankbn( N, (double *)X, stride ), &v );
    103 		assert( status == napi_ok );
    104 
    105 		return v;
    106 	}
    107 
    108 	napi_value Init( napi_env env, napi_value exports ) {
    109 		napi_status status;
    110 		napi_value fcn;
    111 		status = napi_create_function( env, "exports", NAPI_AUTO_LENGTH, node_dmeankbn, NULL, &fcn );
    112 		assert( status == napi_ok );
    113 		return fcn;
    114 	}
    115 
    116 	NAPI_MODULE( NODE_GYP_MODULE_NAME, Init )
    117 } // end namespace stdlib_stats_base_dmeankbn