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diff --git a/unix/as.vax/awsus.s b/unix/as.vax/awsus.s
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+# AWSUS -- Weighted sum of two type short vectors.
+
+	.data	0
+	.globl	_awsus_
+	.align	2
+	.text
+
+	.set	A,	4
+	.set	B,	8
+	.set	C,	12
+	.set	NPIX,	16
+	.set	W1,	20
+	.set	W2,	24
+
+	# AWSUS (a, b, c, npix, w1, w2)
+	#
+	# registers:
+	#	r0	max_a
+	#	r1	a
+	#	r2	b
+	#	r3	c
+	#	r4	w1	(real)
+	#	r5	w2	(real)
+
+_awsus_:
+	.word	0374
+	movl	A(ap), r1
+	movl	B(ap), r2
+	movl	C(ap), r3
+	mull3	$2, *NPIX(ap), r0
+	addl2	r1, r0
+	movf	*W1(ap), r4
+	movf	*W2(ap), r5
+
+	# c[i] = a[i] * w1 + b[i] * w2
+L1:
+	cvtwf	(r1)+, r6
+	mulf2	r4, r6
+	cvtwf	(r2)+, r7
+	mulf2	r5, r7
+	addf2	r6, r7
+	cvtfw	r7, (r3)+
+
+	cmpl	r1, r0
+	blssu	L1
+
+	ret