Add assert and test.
diff --git a/double-conversion/fixed-dtoa.cc b/double-conversion/fixed-dtoa.cc
index e06617b..0f55a0b 100644
--- a/double-conversion/fixed-dtoa.cc
+++ b/double-conversion/fixed-dtoa.cc
@@ -259,6 +259,7 @@
fractionals -= static_cast<uint64_t>(digit) << point;
}
// If the first bit after the point is set we have to round up.
+ ASSERT(fractionals == 0 || point - 1 >= 0);
if ((fractionals != 0) && ((fractionals >> (point - 1)) & 1) == 1) {
RoundUp(buffer, length, decimal_point);
}
diff --git a/test/cctest/test-fixed-dtoa.cc b/test/cctest/test-fixed-dtoa.cc
index 5ffac58..e66f389 100644
--- a/test/cctest/test-fixed-dtoa.cc
+++ b/test/cctest/test-fixed-dtoa.cc
@@ -485,6 +485,10 @@
buffer, &length, &point));
CHECK_EQ("1000000000000000128", buffer.start());
CHECK_EQ(19, point);
+
+ CHECK(FastFixedDtoa(2.10861548515811875e+15, 17, buffer, &length, &point));
+ CHECK_EQ("210861548515811875", buffer.start());
+ CHECK_EQ(16, point);
}
