From 1b8cb9940e7c586b387cb212b4d9b9dbb881d62a Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Thu, 24 Sep 2015 11:21:20 +0200
Subject: Fixed AstNode::mkconst_bits() segfault on zero-sized constant
---
frontends/ast/ast.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index a45859157..5044eeabc 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -699,7 +699,7 @@ AstNode *AstNode::mkconst_bits(const std::vector<RTLIL::State> &v, bool is_signe
for (size_t i = 0; i < 32; i++) {
if (i < node->bits.size())
node->integer |= (node->bits[i] == RTLIL::S1) << i;
- else if (is_signed)
+ else if (is_signed && !node->bits.empty())
node->integer |= (node->bits.back() == RTLIL::S1) << i;
}
node->range_valid = true;
--
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