fix: update implementation to preserve signed zeros

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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/dsumpw/include/stdlib/blas/ext/base/dsumpw.h

@@ -31,7 +31,7 @@ extern "C" {
 /**
 * Computes the sum of double-precision floating-point strided array elements using pairwise summation.
 */
-double API_SUFFIX(stdlib_strided_dsumpw)( const CBLAS_INT N, const double *X, const CBLAS_INT stride );
+double API_SUFFIX(stdlib_strided_dsumpw)( const CBLAS_INT N, const double *X, const CBLAS_INT strideX );
 
 /**
 * Computes the sum of double-precision floating-point strided array elements using pairwise summation and alternative indexing semantics.

lib/node_modules/@stdlib/blas/ext/base/dsumpw/src/main.c

@@ -82,8 +82,9 @@ double API_SUFFIX(stdlib_strided_dsumpw_ndarray)( const CBLAS_INT N, const doubl
 	}
 	if ( N < 8 ) {
 		// Use simple summation...
-		sum = 0.0;
-		for ( i = 0; i < N; i++ ) {
+		sum = X[ ix ];
+		ix += strideX;
+		for ( i = 1; i < N; i++ ) {
 			sum += X[ ix ];
 			ix += strideX;
 		}
@@ -118,7 +119,7 @@ double API_SUFFIX(stdlib_strided_dsumpw_ndarray)( const CBLAS_INT N, const doubl
 		sum = ( (s0+s1) + (s2+s3) ) + ( (s4+s5) + (s6+s7) );
 
 		// Clean-up loop...
-		for (; i < N; i++ ) {
+		for ( ; i < N; i++ ) {
 			sum += X[ ix ];
 			ix += strideX;
 		}