From 8258586c7db3989a9c7f615b2f273142ba5f22d5 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddieh@ece.ubc.ca>
Date: Thu, 8 Nov 2018 16:21:31 -0800
Subject: [common] placer to produce error when >1 cell->bel constraint

---
 common/placer1.cc | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'common/placer1.cc')

diff --git a/common/placer1.cc b/common/placer1.cc
index 01f822a5..0d7c0701 100644
--- a/common/placer1.cc
+++ b/common/placer1.cc
@@ -118,6 +118,12 @@ class SAPlacer
                               loc_name.c_str(), bel_type.c_str(ctx), cell->name.c_str(ctx), cell->type.c_str(ctx));
                 }
 
+                auto bound_cell = ctx->getBoundBelCell(bel);
+                if (bound_cell) {
+                    log_error("Cell \'%s\' cannot be bound to bel \'%s\' since it is already bound to cell \'%s\'\n",
+                              cell->name.c_str(ctx), loc_name.c_str(), bound_cell->name.c_str(ctx));
+                }
+
                 ctx->bindBel(bel, cell, STRENGTH_USER);
                 locked_bels.insert(bel);
                 placed_cells++;
-- 
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