refactor: avoid temporary complex number instantiation

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Author: kgryte

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

@@ -20,9 +20,11 @@
 
 // MODULES //
 
+var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
+var muladd = require( '@stdlib/complex/float64/base/mul-add' ).assign;
+var real = require( '@stdlib/complex/float64/real' );
+var imag = require( '@stdlib/complex/float64/imag' );
 var dcabs1 = require( '@stdlib/blas/base/dcabs1' );
-var cmul = require( '@stdlib/complex/float64/base/mul' );
-var cadd = require( '@stdlib/complex/float64/base/add' );
 
 
 // MAIN //
@@ -62,8 +64,14 @@ var cadd = require( '@stdlib/complex/float64/base/add' );
 * // returns 7.0
 */
 function zaxpy( N, za, zx, strideX, offsetX, zy, strideY, offsetY ) {
+	var viewX;
+	var viewY;
+	var sx;
+	var sy;
 	var ix;
 	var iy;
+	var re;
+	var im;
 	var i;
 
 	if ( N <= 0 ) {
@@ -72,12 +80,18 @@ function zaxpy( N, za, zx, strideX, offsetX, zy, strideY, offsetY ) {
 	if ( dcabs1( za ) === 0.0 ) {
 		return zy;
 	}
-	ix = offsetX;
-	iy = offsetY;
+	re = real( za );
+	im = imag( za );
+	viewX = reinterpret( zx, 0 );
+	viewY = reinterpret( zy, 0 );
+	sx = strideX * 2;
+	sy = strideY * 2;
+	ix = offsetX * 2;
+	iy = offsetY * 2;
 	for ( i = 0; i < N; i++ ) {
-		zy.set( cadd( cmul( za, zx.get( ix ) ), zy.get( iy ) ), iy );
-		ix += strideX;
-		iy += strideY;
+		muladd( re, im, viewX[ ix ], viewX[ ix+1 ], viewY[ iy ], viewY[ iy+1 ], viewY, 1, iy ); // eslint-disable-line max-len
+		ix += sx;
+		iy += sy;
 	}
 	return zy;
 }