Don't eliminate side effects on void assign.

	The last changes would drop void assignments as they
	could have no side effects. Unfortunately, this also meant
	that the side effects of the arguments would be dropped.

1 files changed, 5 insertions, 1 deletions

diff --git a/6/simp.c b/6/simp.c
index 1f2aee3..862aac8 100644
--- a/6/simp.c
+++ b/6/simp.c
@@ -1540,8 +1540,12 @@ static Node *rval(Simp *s, Node *n, Node *dst)
 		append(s, mkexpr(n->loc, Oret, NULL));
 		break;
 	case Oasn:
-		if (tybase(exprtype(n))->type != Tyvoid)
+		if (tybase(exprtype(n))->type == Tyvoid) {
+			if (!ispure(args[1]))
+				r = rval(s, args[1], NULL);
+		} else {
 			r = assign(s, args[0], args[1]);
+		}
 		break;
 	case Ocall:
 		r = simpcall(s, n, dst);