diff --git a/PDelays.cc b/PDelays.cc
index 3fd3ce710..76a34e8b9 100644
--- a/PDelays.cc
+++ b/PDelays.cc
@@ -74,7 +74,7 @@ static NetExpr*calculate_val(Design*des, NetScope*scope, const PExpr*expr)
 	    verireal fn = tmp->value();
 
 	    int shift = scope->time_unit() - des->get_precision();
-	    long delay = fn.as_long(shift);
+	    int64_t delay = fn.as_long64(shift);
 	    if (delay < 0)
 		  delay = 0;
 
@@ -88,8 +88,7 @@ static NetExpr*calculate_val(Design*des, NetScope*scope, const PExpr*expr)
       if (NetEConst*tmp = dynamic_cast<NetEConst*>(dex)) {
 	    verinum fn = tmp->value();
 
-	    unsigned long delay =
-		  des->scale_to_precision(fn.as_ulong(), scope);
+	    uint64_t delay = des->scale_to_precision(fn.as_ulong64(), scope);
 
 	    delete tmp;
 	    NetEConst*tmp2 = new NetEConst(verinum(delay));
diff --git a/PGate.cc b/PGate.cc
index 7cacffe43..76950cef3 100644
--- a/PGate.cc
+++ b/PGate.cc
@@ -99,59 +99,6 @@ void PGate::eval_delays(Design*des, NetScope*scope,
 			 as_net_flag);
 }
 
-void PGate::eval_delays(Design*des, NetScope*scope,
-			unsigned long&rise_time,
-			unsigned long&fall_time,
-			unsigned long&decay_time) const
-{
-      NetExpr*rise_expr, *fall_expr, *decay_expr;
-      delay_.eval_delays(des, scope, rise_expr, fall_expr, decay_expr);
-
-      if (rise_expr == 0) {
-	    rise_time = 0;
-	    fall_time = 0;
-	    decay_time = 0;
-      }
-
-      if (NetEConst*tmp = dynamic_cast<NetEConst*> (rise_expr)) {
-	    rise_time = tmp->value().as_ulong();
-
-      } else {
-	    cerr << get_fileline() << ": error: Delay expressions must be "
-		 << "constant here." << endl;
-	    cerr << get_fileline() << ":      : Cannot calculate "
-		 << *rise_expr << endl;
-	    des->errors += 1;
-	    rise_time = 0;
-      }
-
-      if (NetEConst*tmp = dynamic_cast<NetEConst*> (fall_expr)) {
-	    fall_time = tmp->value().as_ulong();
-
-      } else {
-	    if (fall_expr != rise_expr) {
-		  cerr << get_fileline() << ": error: Delay expressions must be "
-		       << "constant here." << endl;
-		  cerr << get_fileline() << ":      : Cannot calculate "
-		       << *rise_expr << endl;
-	    }
-	    des->errors += 1;
-	    fall_time = 0;
-      }
-
-      if (NetEConst*tmp = dynamic_cast<NetEConst*> (decay_expr)) {
-	    decay_time = tmp->value().as_ulong();
-
-      } else {
-	    cerr << get_fileline() << ": error: Delay expressions must be "
-		 << "constant here." << endl;
-	    cerr << get_fileline() << ":      : Cannot calculate "
-		 << *rise_expr << endl;
-	    des->errors += 1;
-	    decay_time = 0;
-      }
-}
-
 PGAssign::PGAssign(svector<PExpr*>*pins)
 : PGate(perm_string(), pins)
 {
diff --git a/PGate.h b/PGate.h
index b52763ee5..b60100335 100644
--- a/PGate.h
+++ b/PGate.h
@@ -62,15 +62,6 @@ class PGate : public LineInfo {
 
       perm_string get_name() const { return name_; }
 
-	// This method evaluates the delays all the way to an
-	// integer. If the delay is non-constant, then set the times
-	// to 0, print an error message and mark an error to the
-	// design.
-      void eval_delays(Design*des, NetScope*scope,
-		       unsigned long&rise_time,
-		       unsigned long&fall_time,
-		       unsigned long&decay_time) const;
-
 	// This evaluates the delays as far as possible, but returns
 	// an expression, and do not signal errors.
       void eval_delays(Design*des, NetScope*scope,
diff --git a/tgt-vvp/eval_expr.c b/tgt-vvp/eval_expr.c
index 12fb4abbd..d3477f026 100644
--- a/tgt-vvp/eval_expr.c
+++ b/tgt-vvp/eval_expr.c
@@ -155,7 +155,7 @@ uint64_t get_number_immediate64(ivl_expr_t ex)
 		      assert(0);
 		}
 		if (ivl_expr_signed(ex) && bits[nbits-1]=='1' && nbits < 64)
-		      imm |= -UINT64_C(1) << nbits;
+		      imm |= (-UINT64_C(1)) << nbits;
 		break;
 	  }