4 files changed, 6 insertions, 2 deletions
diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index 2d58c682f..38a19a36f 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -84,6 +84,7 @@ std::string AST::type2str(AstNodeType type)
 	X(AST_PREFIX)
 	X(AST_ASSERT)
 	X(AST_ASSUME)
+	X(AST_COVER)
 	X(AST_FCALL)
 	X(AST_TO_BITS)
 	X(AST_TO_SIGNED)
diff --git a/frontends/ast/ast.h b/frontends/ast/ast.h
index cd6e264e6..0b9116d39 100644
--- a/frontends/ast/ast.h
+++ b/frontends/ast/ast.h
@@ -65,6 +65,7 @@ namespace AST
 		AST_PREFIX,
 		AST_ASSERT,
 		AST_ASSUME,
+		AST_COVER,
 
 		AST_FCALL,
 		AST_TO_BITS,
diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc
index db8d7409f..bdac4de00 100644
--- a/frontends/ast/genrtlil.cc
+++ b/frontends/ast/genrtlil.cc
@@ -1336,9 +1336,11 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
 	// generate $assert cells
 	case AST_ASSERT:
 	case AST_ASSUME:
+	case AST_COVER:
 		{
 			const char *celltype = "$assert";
 			if (type == AST_ASSUME) celltype = "$assume";
+			if (type == AST_COVER) celltype = "$cover";
 
 			log_assert(children.size() == 2);
 
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index c1e77c6ec..eecc04132 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1400,7 +1400,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
 	}
 skip_dynamic_range_lvalue_expansion:;
 
-	if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME) && current_block != NULL)
+	if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME || type == AST_COVER) && current_block != NULL)
 	{
 		std::stringstream sstr;
 		sstr << "$formal$" << filename << ":" << linenum << "$" << (autoidx++);
@@ -1462,7 +1462,7 @@ skip_dynamic_range_lvalue_expansion:;
 		goto apply_newNode;
 	}
 
-	if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME) && children.size() == 1)
+	if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME || type == AST_COVER) && children.size() == 1)
 	{
 		children.push_back(mkconst_int(1, false, 1));
 		did_something = true;