From e67bfd93f1cff7eedcc64dfc7b62cc771dd7bcd9 Mon Sep 17 00:00:00 2001
From: Håvard Pettersen <havardpe@yahooinc.com>
Date: Wed, 22 Jun 2022 14:30:44 +0000
Subject: add comment

---
 vespalib/src/vespa/vespalib/stllike/asciistream.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/vespalib/src/vespa/vespalib/stllike/asciistream.cpp b/vespalib/src/vespa/vespalib/stllike/asciistream.cpp
index c8ff6f4dd4b..caacec196bd 100644
--- a/vespalib/src/vespa/vespalib/stllike/asciistream.cpp
+++ b/vespalib/src/vespa/vespalib/stllike/asciistream.cpp
@@ -433,6 +433,8 @@ unsigned long long normalize(long long v, bool &negative) {
     if (v < 0) {
         negative = true;
         if (v == std::numeric_limits<long long>::min()) {
+            // according to UBSAN:
+            // negation of -9223372036854775808 cannot be represented in type 'long long int'; cast to an unsigned type to negate this value to itself
             return v;
         }
         return -v;
-- 
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