diff --git a/sys/src/cmd/7c/cgen.c b/sys/src/cmd/7c/cgen.c
index 2e6010b81..bed0087f9 100644
--- a/sys/src/cmd/7c/cgen.c
+++ b/sys/src/cmd/7c/cgen.c
@@ -287,25 +287,28 @@ cgenrel(Node *n, Node *nn, int inrel)
 				reglcgen(&nod2, l, Z);
 			else
 				nod2 = *l;
-			regalloc(&nod, n, nn);
-			cgen(r, &nod);
+			regalloc(&nod1, r, Z);
+			cgen(r, &nod1);
 		} else {
-			regalloc(&nod, n, nn);
-			cgen(r, &nod);
+			regalloc(&nod1, r, Z);
+			cgen(r, &nod1);
 			if(l->addable < INDEXED)
 				reglcgen(&nod2, l, Z);
 			else
 				nod2 = *l;
 		}
-		regalloc(&nod1, n, Z);
-		gopcode(OAS, &nod2, Z, &nod1);
+		if(nod1.type->etype == nod2.type->etype || !typefd[nod1.type->etype])
+			regalloc(&nod, &nod2, nn);
+		else
+			regalloc(&nod, &nod1, Z);
+		gopcode(OAS, &nod2, Z, &nod);
 		if(nod1.type->etype != nod.type->etype){
 			regalloc(&nod3, &nod, Z);
 			gmove(&nod1, &nod3);
 			regfree(&nod1);
 			nod1 = nod3;
 		}
-		gopcode(o, &nod, &nod1, &nod);
+		gopcode(o, &nod1, &nod, &nod);
 		gmove(&nod, &nod2);
 		if(nn != Z)
 			gmove(&nod, nn);