From e8c12e5f0c49cca4dd54da12003bd010a488aee3 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 25 Dec 2014 20:28:16 +0100
Subject: Various fixes and improvements in "write_smt2 -bv"

---
 backends/smt2/.gitignore    |  1 +
 backends/smt2/smt2.cc       | 35 ++++++++++++++++++++++++++++-------
 backends/smt2/test_cells.sh | 18 ++++++++++++++----
 3 files changed, 43 insertions(+), 11 deletions(-)
 create mode 100644 backends/smt2/.gitignore

(limited to 'backends/smt2')

diff --git a/backends/smt2/.gitignore b/backends/smt2/.gitignore
new file mode 100644
index 00000000..313ea0a1
--- /dev/null
+++ b/backends/smt2/.gitignore
@@ -0,0 +1 @@
+test_cells
diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index c383bbab..8451eff4 100644
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -215,9 +215,9 @@ struct Smt2Worker
 		bool is_signed = cell->getParam("\\A_SIGNED").as_bool();
 		int width = GetSize(sig_y);
 
-		if (type == 's') {
-			width = std::max(width, GetSize(sig_a));
-			width = std::max(width, GetSize(sig_b));
+		if (type == 's' || type == 'd' || type == 'b') {
+			width = std::max(width, GetSize(cell->getPort("\\A")));
+			width = std::max(width, GetSize(cell->getPort("\\B")));
 		}
 
 		if (cell->hasPort("\\A")) {
@@ -240,7 +240,7 @@ struct Smt2Worker
 			else processed_expr += ch;
 		}
 
-		if (width != GetSize(sig_y))
+		if (width != GetSize(sig_y) && type != 'b')
 			processed_expr = stringf("((_ extract %d 0) %s)", GetSize(sig_y)-1, processed_expr.c_str());
 
 		if (type == 'b') {
@@ -347,8 +347,8 @@ struct Smt2Worker
 		if (cell->type == "$add") return export_bvop(cell, "(bvadd A B)");
 		if (cell->type == "$sub") return export_bvop(cell, "(bvsub A B)");
 		if (cell->type == "$mul") return export_bvop(cell, "(bvmul A B)");
-		if (cell->type == "$div") return export_bvop(cell, "(bvUdiv A B)");
-		if (cell->type == "$mod") return export_bvop(cell, "(bvUrem A B)");
+		if (cell->type == "$div") return export_bvop(cell, "(bvUdiv A B)", 'd');
+		if (cell->type == "$mod") return export_bvop(cell, "(bvUrem A B)", 'd');
 
 		if (cell->type == "$reduce_and") return export_reduce(cell, "(and A)", true);
 		if (cell->type == "$reduce_or") return export_reduce(cell, "(or A)", false);
@@ -360,7 +360,28 @@ struct Smt2Worker
 		if (cell->type == "$logic_and") return export_reduce(cell, "(and (or A) (or B))", false);
 		if (cell->type == "$logic_or") return export_reduce(cell, "(or A B)", false);
 
-		// FIXME: $slice $concat $mux $pmux
+		if (cell->type == "$mux" || cell->type == "$pmux")
+		{
+			int width = GetSize(cell->getPort("\\Y"));
+			std::string processed_expr = get_bv(cell->getPort("\\A"));
+
+			RTLIL::SigSpec sig_b = cell->getPort("\\B");
+			RTLIL::SigSpec sig_s = cell->getPort("\\S");
+			get_bv(sig_b);
+			get_bv(sig_s);
+
+			for (int i = 0; i < GetSize(sig_s); i++)
+				processed_expr = stringf("(ite %s %s %s)", get_bool(sig_s[i]).c_str(),
+						get_bv(sig_b.extract(i*width, width)).c_str(), processed_expr.c_str());
+
+			RTLIL::SigSpec sig = sigmap(cell->getPort("\\Y"));
+			decls.push_back(stringf("(define-fun |%s#%d| ((state |%s_s|)) (_ BitVec %d) %s) ; %s\n",
+					log_id(module), idcounter, log_id(module), width, processed_expr.c_str(), log_signal(sig)));
+			register_bv(sig, idcounter++);
+			return;
+		}
+
+		// FIXME: $slice $concat
 
 		log_error("Unsupported cell type %s for cell %s.%s.\n",
 				log_id(cell->type), log_id(module), log_id(cell));
diff --git a/backends/smt2/test_cells.sh b/backends/smt2/test_cells.sh
index 28d5c57f..34adb7af 100644
--- a/backends/smt2/test_cells.sh
+++ b/backends/smt2/test_cells.sh
@@ -6,7 +6,7 @@ rm -rf test_cells
 mkdir test_cells
 cd test_cells
 
-../../../yosys -p 'test_cell -n 2 -w test all /$alu /$macc /$fa /$lcu /$lut /$shift /$shiftx /$div /$mod'
+../../../yosys -p 'test_cell -muxdiv -w test all /$alu /$macc /$fa /$lcu /$lut /$shift /$shiftx'
 
 cat > miter.tpl <<- EOT
 ; #model# (set-option :produce-models true)
@@ -18,7 +18,7 @@ cat > miter.tpl <<- EOT
 ; #model# (get-value ((|miter_n in_A| s) (|miter_n in_B| s) (|miter_n gold_Y| s) (|miter_n gate_Y| s) (|miter_n trigger| s)))
 EOT
 
-for x in test_*.il; do
+for x in $(set +x; ls test_*.il | sort -R); do
 	x=${x%.il}
 	cat > $x.ys <<- EOT
 		read_ilang $x.il
@@ -34,8 +34,11 @@ for x in test_*.il; do
 		dump
 		write_smt2 -bv -tpl miter.tpl $x.smt2
 	EOT
-	../../../yosys $x.ys
-	cvc4 $x.smt2 > $x.result
+	../../../yosys -q $x.ys
+	if ! cvc4 $x.smt2 > $x.result; then
+		cat $x.result
+		exit 1
+	fi
 	if ! grep unsat $x.result; then
 		echo "Proof failed! Extracting model..."
 		sed -i 's/^; #model# //' $x.smt2
@@ -43,3 +46,10 @@ for x in test_*.il; do
 		exit 1
 	fi
 done
+
+set +x
+echo ""
+echo "  All tests passed."
+echo ""
+exit 0
+
-- 
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