feat: add C ndarray implementation for blas/base/dcopy

PR-URL: stdlib-js#2906
Ref: stdlib-js#2039
Co-authored-by: Athan Reines <[email protected]>
Reviewed-by: Athan Reines <[email protected]> 
Signed-off-by: Athan Reines <[email protected]>

lib/node_modules/@stdlib/blas/base/dcopy/README.md

@@ -207,6 +207,31 @@ The function accepts the following arguments:
 void c_dcopy( const CBLAS_INT N, const double *X, const CBLAS_INT strideX, double *Y, const CBLAS_INT strideY );
 ```
 
+#### c_dcopy_ndarray( N, \*X, strideX, offsetX, \*Y, strideY, offsetY )
+
+Copies values from `x` into `y` using alternative indexing semantics.
+
+```c
+double x[] = { 1.0, 2.0, 3.0, 4.0, 5.0 };
+double y[] = { 0.0, 0.0, 0.0, 0.0, 0.0 };
+
+c_dcopy_ndarray( 3, x, 1, 2, y, 1, 2 );
+```
+
+The function accepts the following arguments:
+
+- **N**: `[in] CBLAS_INT` number of indexed elements.
+- **X**: `[in] double*` input array.
+- **strideX**: `[in] CBLAS_INT` index increment for `X`.
+- **offsetX**: `[in] CBLAS_INT` starting index for `X`.
+- **Y**: `[out] double*` output array.
+- **strideY**: `[in] CBLAS_INT` index increment for `Y`.
+- **offsetY**: `[in] CBLAS_INT` starting index for `Y`.
+
+```c
+void c_dcopy_ndarray( const CBLAS_INT N, const double *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, double *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY );
+```
+
 </section>
 
 <!-- /.usage -->
@@ -248,6 +273,14 @@ int main( void ) {
  for ( int i = 0; i < 8; i++ ) {
   printf( "y[ %i ] = %lf\n", i, y[ i ] );
  }
+
+ // Copy elements:
+ c_dcopy_ndarray( N, x, strideX, 0, y, strideY, 6 );
+
+ // Print the result:
+ for ( int i = 0; i < 8; i++ ) {
+  printf( "y[ %i ] = %lf\n", i, y[ i ] );
+ }
 }
 ```
 

lib/node_modules/@stdlib/blas/base/dcopy/benchmark/c/benchmark.length.c

@@ -94,7 +94,7 @@ static double rand_double( void ) {
 * @param len array length
 * @return elapsed time in seconds
 */
-static double benchmark( int iterations, int len ) {
+static double benchmark1( int iterations, int len ) {
  double elapsed;
  double x[ len ];
  double y[ len ];
@@ -120,6 +120,39 @@ static double benchmark( int iterations, int len ) {
  return elapsed;
 }
 
+/**
+* Runs a benchmark.
+*
+* @param iterations number of iterations
+* @param len array length
+* @return elapsed time in seconds
+*/
+static double benchmark2( int iterations, int len ) {
+ double elapsed;
+ double x[ len ];
+ double y[ len ];
+ double t;
+ int i;
+
+ for ( i = 0; i < len; i++ ) {
+ x[ i ] = ( rand_double()*20000.0 ) - 10000.0;
+ y[ i ] = 0.0;
+ }
+ t = tic();
+ for ( i = 0; i < iterations; i++ ) {
+ c_dcopy_ndarray( len, x, 1, 0, y, 1, 0 );
+ if ( y[ 0 ] != y[ 0 ] ) {
+ printf( "should not return NaN\n" );
+ break;
+ }
+ }
+ elapsed = tic() - t;
+ if ( y[ 0 ] != y[ 0 ] ) {
+ printf( "should not return NaN\n" );
+ }
+ return elapsed;
+}
+
 /**
 * Main execution sequence.
 */
@@ -142,7 +175,14 @@ int main( void ) {
  for ( j = 0; j < REPEATS; j++ ) {
  count += 1;
  printf( "# c::%s:len=%d\n", NAME, len );
- elapsed = benchmark( iter, len );
+ elapsed = benchmark1( iter, len );
+ print_results( iter, elapsed );
+ printf( "ok %d benchmark finished\n", count );
+ }
+ for ( j = 0; j < REPEATS; j++ ) {
+ count += 1;
+ printf( "# c::%s:ndarray:len=%d\n", NAME, len );
+ elapsed = benchmark2( iter, len );
  print_results( iter, elapsed );
  printf( "ok %d benchmark finished\n", count );
  }

lib/node_modules/@stdlib/blas/base/dcopy/examples/c/example.c

@@ -38,4 +38,12 @@ int main( void ) {
  for ( int i = 0; i < 8; i++ ) {
  printf( "y[ %i ] = %lf\n", i, y[ i ] );
  }
+
+ // Copy elements:
+ c_dcopy_ndarray( N, x, strideX, 0, y, strideY, 6 );
+
+ // Print the result:
+ for ( int i = 0; i < 8; i++ ) {
+ printf( "y[ %i ] = %lf\n", i, y[ i ] );
+ }
 }

lib/node_modules/@stdlib/blas/base/dcopy/include/stdlib/blas/base/dcopy.h

@@ -36,6 +36,11 @@ extern "C" {
 */
 void API_SUFFIX(c_dcopy)( const CBLAS_INT N, const double *X, const CBLAS_INT strideX, double *Y, const CBLAS_INT strideY );
 
+/**
+* Copies values from `X` into `Y` using alternative indexing semantics.
+*/
+void API_SUFFIX(c_dcopy_ndarray)( const CBLAS_INT N, const double *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, double *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY );
+
 #ifdef __cplusplus
 }
 #endif

lib/node_modules/@stdlib/blas/base/dcopy/lib/ndarray.native.js

@@ -20,9 +20,7 @@
 
 // MODULES //
 
-var minViewBufferIndex = require( '@stdlib/strided/base/min-view-buffer-index' );
-var offsetView = require( '@stdlib/strided/base/offset-view' );
-var addon = require( './dcopy.native.js' );
+var addon = require( './../src/addon.node' );
 
 
 // MAIN //
@@ -49,16 +47,7 @@ var addon = require( './dcopy.native.js' );
 * // y => <Float64Array>[ 1.0, 2.0, 3.0, 4.0, 5.0 ]
 */
 function dcopy( N, x, strideX, offsetX, y, strideY, offsetY ) {
- var viewX;
- var viewY;
-
- offsetX = minViewBufferIndex( N, strideX, offsetX );
- offsetY = minViewBufferIndex( N, strideY, offsetY );
-
- viewX = offsetView( x, offsetX );
- viewY = offsetView( y, offsetY );
-
- addon( N, viewX, strideX, viewY, strideY );
+ addon.ndarray( N, x, strideX, offsetX, y, strideY, offsetY );
  return y;
 }