refactor: reduce arithmetic operations

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---

Author: Shabareesh Shetty

lib/node_modules/@stdlib/blas/base/dsyrk/lib/base.js

@@ -129,6 +129,7 @@ function scal( uplo, N, beta, X, strideX1, strideX2, offsetX ) { // TODO: consid
 	var x1;
 	var i1;
 	var i0;
+	var ix;
 
 	isrm = isRowMajor( [ strideX1, strideX2 ] );
 
@@ -143,18 +144,20 @@ function scal( uplo, N, beta, X, strideX1, strideX2, offsetX ) { // TODO: consid
 		( isrm && uplo === 'upper' ) || ( !isrm && uplo === 'lower' )
 	) {
 		for ( i1 = 0; i1 < N; i1++ ) {
+			ix = offsetX + ( i1 * x1 );
 			for ( i0 = i1; i0 < N; i0++ ) {
-				idx = offsetX + ( i1 * x1 ) + ( i0 * x0 );
-				X[ idx ] = X[ idx ] * beta;
+				idx = ix + ( i0 * x0 );
+				X[ idx ] *= beta;
 			}
 		}
 		return X;
 	}
 	// ( isrm && uplo === 'lower' ) || ( !isrm && uplo === 'upper' )
 	for ( i1 = 0; i1 < N; i1++ ) {
+		ix = offsetX + ( i1 * x1 );
 		for ( i0 = 0; i0 <= i1; i0++ ) {
-			idx = offsetX + ( i1 * x1 ) + ( i0 * x0 );
-			X[ idx ] = X[ idx ] * beta;
+			idx = ix + ( i0 * x0 );
+			X[ idx ] *= beta;
 		}
 	}
 	return X;