fix: preserve sign of zero

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/base/dcusumpw/lib/ndarray.js

@@ -74,8 +74,11 @@ function dcusumpw( N, sum, x, strideX, offsetX, y, strideY, offsetY ) {
 	ix = offsetX;
 	iy = offsetY;
 	if ( N <= BLOCKSIZE ) {
-		s = 0.0;
-		for ( i = 0; i < N; i++ ) {
+		s = x[ ix ];
+		y[ iy ] = sum + s;
+		ix += strideX;
+		iy += strideY;
+		for ( i = 1; i < N; i++ ) {
 			s += x[ ix ];
 			y[ iy ] = sum + s;
 			ix += strideX;

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

@@ -68,10 +68,14 @@ void API_SUFFIX(stdlib_strided_dcusumpw_ndarray)( const CBLAS_INT N, const doubl
 	}
 	ix = offsetX;
 	iy = offsetY;
+
 	// Blocksize for pairwise summation...
 	if ( N <= 128 ) {
-		s = 0.0;
-		for ( i = 0; i < N; i++ ) {
+		s = X[ ix ];
+		Y[ iy ] = sum + s;
+		ix += strideX;
+		iy += strideY;
+		for ( i = 1; i < N; i++ ) {
 			s += X[ ix ];
 			Y[ iy ] = sum + s;
 			ix += strideX;