oops, memcpy -> memmove

util.c

@@ -100,27 +100,28 @@ blknew()
 void
 blkdel(Blk *b)
 {
-	Blk *s, **ps;
+	Blk *s, **ps, *succ[3];
 	Phi *p;
 	uint a;
 
-	if (b->s1 == b->s2) /* do not delete twice */
-		b->s2 = 0;
-	for (ps=(Blk*[]){b->s1, b->s2, 0}; (s=*ps); ps++) {
+	succ[0] = b->s1;
+	succ[1] = b->s2 == b->s1 ? 0 : b->s2;
+	succ[2] = 0;
+	for (ps=succ; (s=*ps); ps++) {
 		for (p=s->phi; p; p=p->link) {
 			for (a=0; p->blk[a]!=b; a++)
 				assert(a+1<p->narg);
 			p->narg--;
-			memcpy(&p->blk[a], &p->blk[a+1],
+			memmove(&p->blk[a], &p->blk[a+1],
 				sizeof p->blk[0] * (p->narg-a));
-			memcpy(&p->arg[a], &p->arg[a+1],
+			memmove(&p->arg[a], &p->arg[a+1],
 				sizeof p->arg[0] * (p->narg-a));
 		}
 		if (s->npred != 0) {
 			for (a=0; s->pred[a]!=b; a++)
 				assert(a+1<s->npred);
 			s->npred--;
-			memcpy(&s->pred[a], &s->pred[a+1],
+			memmove(&s->pred[a], &s->pred[a+1],
 				sizeof s->pred[0] * (s->npred-a));
 		}
 	}