From 6206a3af304d25db1f8e057b9c88e0ad2d15dac4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Povi=C5=A1er?= <povik@cutebit.org>
Date: Tue, 12 Dec 2023 09:51:17 +0100
Subject: [PATCH] cxxrtl: Handle case of `Bits < 4` in formatting of values

---
 backends/cxxrtl/runtime/cxxrtl/cxxrtl.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/backends/cxxrtl/runtime/cxxrtl/cxxrtl.h b/backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
index a1d32fa60..04ed48eb3 100644
--- a/backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
+++ b/backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
@@ -796,7 +796,10 @@ std::ostream &operator<<(std::ostream &os, const value_formatted<Bits> &vf)
 				buf += '0';
 			while (!val.is_zero()) {
 				value<Bits> quotient, remainder;
-				std::tie(quotient, remainder) = val.udivmod(value<Bits>{10u});
+				if (Bits >= 4)
+					std::tie(quotient, remainder) = val.udivmod(value<Bits>{10u});
+				else
+					std::tie(quotient, remainder) = std::make_pair(value<Bits>{0u}, val);
 				buf += '0' + remainder.template trunc<(Bits > 4 ? 4 : Bits)>().val().template get<uint8_t>();
 				val = quotient;
 			}