Add benchmark for retrieving ndarray subscript index modes

Author: kgryte

Diff for: lib/node_modules/@stdlib/ndarray/ctor/benchmark/c/benchmark.c

@@ -3062,6 +3062,50 @@ double benchmark62() {
 	return elapsed;
 }
 
+/**
+* Runs a benchmark.
+*
+* @return elapsed time in seconds
+*/
+double benchmark63() {
+	enum STDLIB_NDARRAY_INDEX_MODE *v;
+	double elapsed;
+	double t;
+	int i;
+
+	uint8_t buffer[] = { 0, 0, 0, 0, 0, 0 };
+	int64_t ndims = 2;
+	int64_t shape[] = { 3, 2 };
+	int64_t strides[] = { 2, 1 };
+	int64_t offset = 0;
+	int64_t nsubmodes = 1;
+	enum STDLIB_NDARRAY_INDEX_MODE submodes[] = { STDLIB_NDARRAY_INDEX_ERROR };
+
+	struct ndarray *arr = stdlib_ndarray_constructor( STDLIB_NDARRAY_UINT8, buffer, ndims, shape, strides, offset, STDLIB_NDARRAY_ROW_MAJOR, STDLIB_NDARRAY_INDEX_ERROR, nsubmodes, submodes );
+	if ( arr == NULL ) {
+		printf( "unable to allocate memory\n" );
+		exit( 1 );
+	}
+
+	t = tic();
+	for ( i = 0; i < ITERATIONS; i++ ) {
+		// NOTE: this is likely to be optimized away by a modern compiler, making this benchmark meaningless.
+		v = stdlib_ndarray_submodes( arr );
+		if ( v[ 0 ] != submodes[ 0 ] ) {
+			printf( "unexpected result\n" );
+			break;
+		}
+	}
+	elapsed = tic() - t;
+
+	if ( v[ 0 ] != submodes[ 0 ] ) {
+		printf( "unexpected result\n" );
+	}
+	free( arr );
+
+	return elapsed;
+}
+
 /**
 * Main execution sequence.
 */
@@ -3510,5 +3554,12 @@ int main( void ) {
 		print_results( elapsed );
 		printf( "ok %d benchmark finished\n", count );
 	}
+	for ( i = 0; i < REPEATS; i++ ) {
+		count += 1;
+		printf( "# c::native::%s::get:submodes\n", NAME );
+		elapsed = benchmark63();
+		print_results( elapsed );
+		printf( "ok %d benchmark finished\n", count );
+	}
 	print_summary( count, count );
 }