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

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

@@ -163,6 +163,142 @@ console.log( y );
 
 <!-- /.examples -->
 
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/blas/base/saxpy.h"
+```
+
+#### c_saxpy( N, alpha, \*X, strideX, \*Y, strideY )
+
+Multiplies a vector `X` by a constant and adds the result to `Y`.
+
+```c
+const float x[] = { 1.0f, 2.0f, 3.0f, 4.0f };
+float y[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+
+c_saxpy( 4, 5.0f, x, 1, y, 1 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] CBLAS_INT` number of indexed elements.
+-   **alpha**: `[in] float` scalar constant.
+-   **X**: `[in] float*` input array.
+-   **strideX**: `[in] CBLAS_INT` index increment for `X`.
+-   **Y**: `[inout] float*` output array.
+-   **strideY**: `[in CBLAS_INT` index increment for `Y`.
+
+```c
+void c_saxpy( const CBLAS_INT N, const float alpha, const float *X, const CBLAS_INT strideX, float *Y, const CBLAS_INT strideY );
+```
+
+#### c_saxpy_ndarray( N, alpha, \*X, strideX, offsetX, \*Y, strideY, offsetY )
+
+Multiplies a vector `X` by a constant and adds the result to `Y` using alternative indexing semantics.
+
+```c
+const float x[] = { 1.0f, 2.0f, 3.0f, 4.0f };
+float y[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+
+c_saxpy_ndarray( 4, 5.0f, x, 1, 0, y, 1, 0 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] CBLAS_INT` number of indexed elements.
+-   **alpha**: `[in] float` scalar constant.
+-   **X**: `[in] float*` input array.
+-   **strideX**: `[in] CBLAS_INT` index increment for `X`.
+-   **offsetX**: `[in] CBLAS_INT` starting index for `X`.
+-   **Y**: `[inout] float*` output array.
+-   **strideY**: `[in CBLAS_INT` index increment for `Y`.
+-   **offsetY**: `[in] CBLAS_INT` starting index for `Y`.
+
+```c
+void c_saxpy_ndarray( const CBLAS_INT N, const float alpha, const float *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, float *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/blas/base/saxpy.h"
+#include <stdio.h>
+
+int main( void ) {
+    // Create strided arrays:
+    const float x[] = { 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f };
+    float y[] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
+
+    // Specify the number of elements:
+    const int N = 4;
+
+    // Specify stride lengths:
+    const int strideX = 2;
+    const int strideY = -2;
+
+    // Compute `a*x + y`:
+    c_saxpy( N, 5.0f, x, strideX, y, strideY );
+
+    // Print the result:
+    for ( int i = 0; i < 8; i++ ) {
+        printf( "y[ %i ] = %f\n", i, y[ i ] );
+    }
+
+    // Compute `a*x + y`:
+    c_saxpy_ndarray( N, 5.0f, x, strideX, 1, y, strideY, 7 );
+
+    // Print the result:
+    for ( int i = 0; i < 8; i++ ) {
+        printf( "y[ %i ] = %f\n", i, y[ i ] );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">

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

@@ -94,7 +94,7 @@ static float rand_float( 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;
 	float x[ len ];
 	float 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;
+	float x[ len ];
+	float y[ len ];
+	double t;
+	int i;
+
+	for ( i = 0; i < len; i++ ) {
+		x[ i ] = ( rand_float()*100.0f ) - 200.0f;
+		y[ i ] = ( rand_float()*10000.0f ) - 20000.0f;
+	}
+	t = tic();
+	for ( i = 0; i < iterations; i++ ) {
+		c_saxpy_ndarray( len, 5.0f, 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/saxpy/examples/c/example.c

@@ -38,4 +38,12 @@ int main( void ) {
 	for ( int i = 0; i < 8; i++ ) {
 		printf( "y[ %i ] = %f\n", i, y[ i ] );
 	}
+
+	// Compute `a*x + y`:
+	c_saxpy_ndarray( N, 5.0f, x, strideX, 1, y, strideY, 7 );
+
+	// Print the result:
+	for ( int i = 0; i < 8; i++ ) {
+		printf( "y[ %i ] = %f\n", i, y[ i ] );
+	}
 }

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

@@ -22,6 +22,8 @@
 #ifndef SAXPY_H
 #define SAXPY_H
 
+#include "stdlib/blas/base/shared.h"
+
 /*
 * If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
 */
@@ -32,7 +34,12 @@ extern "C" {
 /**
 * Multiplies a vector `X` by a constant and adds the result to `Y`.
 */
-void c_saxpy( const int N, const float alpha, const float *X, const int strideX, float *Y, const int strideY );
+void API_SUFFIX(c_saxpy)( const CBLAS_INT N, const float alpha, const float *X, const CBLAS_INT strideX, float *Y, const CBLAS_INT strideY );
+
+/**
+* Multiplies a vector `X` by a constant and adds the result to `Y` using alternative indexing semantics.
+*/
+void API_SUFFIX(c_saxpy_ndarray)( const CBLAS_INT N, const float alpha, const float *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, float *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY );
 
 #ifdef __cplusplus
 }

lib/node_modules/@stdlib/blas/base/saxpy/include/stdlib/blas/base/saxpy_cblas.h

@@ -22,6 +22,8 @@
 #ifndef SAXPY_CBLAS_H
 #define SAXPY_CBLAS_H
 
+#include "stdlib/blas/base/shared.h"
+
 /*
 * If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
 */
@@ -32,7 +34,7 @@ extern "C" {
 /**
 * Multiplies a vector `X` by a constant and adds the result to `Y`.
 */
-void cblas_saxpy( const int N, const float alpha, const float *X, const int strideX, float *Y, const int strideY );
+void API_SUFFIX(cblas_saxpy)( const CBLAS_INT N, const float alpha, const float *X, const CBLAS_INT strideX, float *Y, const CBLAS_INT strideY );
 
 #ifdef __cplusplus
 }

lib/node_modules/@stdlib/blas/base/saxpy/lib/ndarray.js

@@ -37,10 +37,10 @@ var M = 4;
 * @param {number} alpha - scalar
 * @param {Float32Array} x - input array
 * @param {integer} strideX - `x` stride length
-* @param {NonNegativeInteger} offsetX - starting `x` index
+* @param {NonNegativeInteger} offsetX - starting index for `x`
 * @param {Float32Array} y - output array
 * @param {integer} strideY - `y` stride length
-* @param {NonNegativeInteger} offsetY - starting `y` index
+* @param {NonNegativeInteger} offsetY - starting index for `y`
 * @returns {Float32Array} output array
 *
 * @example

lib/node_modules/@stdlib/blas/base/saxpy/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( './saxpy.native.js' );
+var addon = require( './../src/addon.node' );
 
 
 // MAIN //
@@ -34,10 +32,10 @@ var addon = require( './saxpy.native.js' );
 * @param {number} alpha - scalar
 * @param {Float32Array} x - input array
 * @param {integer} strideX - `x` stride length
-* @param {NonNegativeInteger} offsetX - starting `x` index
+* @param {NonNegativeInteger} offsetX - starting index for `x`
 * @param {Float32Array} y - output array
 * @param {integer} strideY - `y` stride length
-* @param {NonNegativeInteger} offsetY - starting `y` index
+* @param {NonNegativeInteger} offsetY - starting index for `y`
 * @returns {Float32Array} output array
 *
 * @example
@@ -51,16 +49,7 @@ var addon = require( './saxpy.native.js' );
 * // y => <Float32Array>[ 6.0, 11.0, 16.0, 21.0, 26.0 ]
 */
 function saxpy( N, alpha, 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, alpha, viewX, strideX, viewY, strideY );
+	addon.ndarray( N, alpha, x, strideX, offsetX, y, strideY, offsetY );
 	return y;
 }