From 3f73c9bb54253536b4dcbc53e1494e28aa80601c Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Fri, 1 Aug 2008 16:35:47 +0100
Subject: [PATCH] Make sure argument to unary - is signed

---
 tgt-vhdl/expr.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tgt-vhdl/expr.cc b/tgt-vhdl/expr.cc
index c57f951a1..8de363b86 100644
--- a/tgt-vhdl/expr.cc
+++ b/tgt-vhdl/expr.cc
@@ -158,6 +158,7 @@ static vhdl_expr *translate_unary(ivl_expr_t e)
       return new vhdl_unaryop_expr
          (VHDL_UNARYOP_NOT, operand, new vhdl_type(*operand->get_type()));
    case '-':
+      operand = change_signedness(operand, true);
       return new vhdl_unaryop_expr
          (VHDL_UNARYOP_NEG, operand, new vhdl_type(*operand->get_type()));
    case 'N':   // NOR