bench: refactor to use dynamic memory allocation in blas/ext/base/dsnannsumors

PR-URL: #10746
Ref: #8643

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: prajjwalbajpai

lib/node_modules/@stdlib/blas/ext/base/dsnannsumors/benchmark/c/benchmark.length.c

@@ -96,12 +96,13 @@ static float rand_float( void ) {
 */
 static double benchmark1( int iterations, int len ) {
 	double elapsed;
-	float x[ len ];
+	float *x;
 	CBLAS_INT n;
 	double v;
 	double t;
 	int i;
 
+	x = (float *) malloc( len * sizeof( float ) );
 	for ( i = 0; i < len; i++ ) {
 		if ( rand_float() < 0.2f ) {
 			x[ i ] = 0.0f / 0.0f; // NaN
@@ -124,6 +125,7 @@ static double benchmark1( int iterations, int len ) {
 	if ( v != v || n < 0 ) {
 		printf( "should not return NaN\n" );
 	}
+	free( x );
 	return elapsed;
 }
 
@@ -136,12 +138,13 @@ static double benchmark1( int iterations, int len ) {
 */
 static double benchmark2( int iterations, int len ) {
 	double elapsed;
-	float x[ len ];
+	float *x;
 	CBLAS_INT n;
 	double v;
 	double t;
 	int i;
 
+	x = (float *) malloc( len * sizeof( float ) );
 	for ( i = 0; i < len; i++ ) {
 		if ( rand_float() < 0.2f ) {
 			x[ i ] = 0.0f / 0.0f; // NaN
@@ -164,6 +167,7 @@ static double benchmark2( int iterations, int len ) {
 	if ( v != v || n < 0 ) {
 		printf( "should not return NaN\n" );
 	}
+	free( x );
 	return elapsed;
 }