From 2122ae69b3c12057d3d4a4f5060bbdba70462d6a Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Wed, 17 May 2017 21:07:54 +0200
Subject: [PATCH] Add workaround for CBMC bug to SimpleC back-end
---
backends/simplec/simplec.cc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/backends/simplec/simplec.cc b/backends/simplec/simplec.cc
index 5768e3499..c9656caff 100644
--- a/backends/simplec/simplec.cc
+++ b/backends/simplec/simplec.cc
@@ -482,7 +482,9 @@ struct SimplecWorker
string a_expr = a.wire ? util_get_bit(work->prefix + cid(a.wire->name), a.wire->width, a.offset) : a.data ? "1" : "0";
string b_expr = b.wire ? util_get_bit(work->prefix + cid(b.wire->name), b.wire->width, b.offset) : b.data ? "1" : "0";
string s_expr = s.wire ? util_get_bit(work->prefix + cid(s.wire->name), s.wire->width, s.offset) : s.data ? "1" : "0";
- string expr = stringf("%s ? %s : %s", s_expr.c_str(), b_expr.c_str(), a_expr.c_str());
+
+ // casts to bool are a workaround for CBMC bug (https://github.com/diffblue/cbmc/issues/933)
+ string expr = stringf("%s ? (bool)%s : (bool)%s", s_expr.c_str(), b_expr.c_str(), a_expr.c_str());
log_assert(y.wire);
funct_declarations.push_back(util_set_bit(work->prefix + cid(y.wire->name), y.wire->width, y.offset, expr) +