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diff --git a/mfbt/double-conversion/double-conversion/double-to-string.cc b/mfbt/double-conversion/double-conversion/double-to-string.cc
--- a/mfbt/double-conversion/double-conversion/double-to-string.cc
+++ b/mfbt/double-conversion/double-conversion/double-to-string.cc
@@ -290,17 +290,19 @@ bool DoubleToStringConverter::ToExponent
exponent,
result_builder);
return true;
}
bool DoubleToStringConverter::ToPrecision(double value,
int precision,
+ bool* used_exponential_notation,
StringBuilder* result_builder) const {
+ *used_exponential_notation = false;
if (Double(value).IsSpecial()) {
return HandleSpecialValues(value, result_builder);
}
if (precision < kMinPrecisionDigits || precision > kMaxPrecisionDigits) {
return false;
}
@@ -332,16 +334,17 @@ bool DoubleToStringConverter::ToPrecisio
max_trailing_padding_zeroes_in_precision_mode_)) {
// Fill buffer to contain 'precision' digits.
// Usually the buffer is already at the correct length, but 'DoubleToAscii'
// is allowed to return less characters.
for (int i = decimal_rep_length; i < precision; ++i) {
decimal_rep[i] = '0';
}
+ *used_exponential_notation = true;
CreateExponentialRepresentation(decimal_rep,
precision,
exponent,
result_builder);
} else {
CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
(std::max)(0, precision - decimal_point),
result_builder);
diff --git a/mfbt/double-conversion/double-conversion/double-to-string.h b/mfbt/double-conversion/double-conversion/double-to-string.h
--- a/mfbt/double-conversion/double-conversion/double-to-string.h
+++ b/mfbt/double-conversion/double-conversion/double-to-string.h
@@ -273,16 +273,17 @@ class DoubleToStringConverter {
// been provided to the constructor,
// - precision < kMinPericisionDigits
// - precision > kMaxPrecisionDigits
// The last condition implies that the result will never contain more than
// kMaxPrecisionDigits + 7 characters (the sign, the decimal point, the
// exponent character, the exponent's sign, and at most 3 exponent digits).
MFBT_API bool ToPrecision(double value,
int precision,
+ bool* used_exponential_notation,
StringBuilder* result_builder) const;
enum DtoaMode {
// Produce the shortest correct representation.
// For example the output of 0.299999999999999988897 is (the less accurate
// but correct) 0.3.
SHORTEST,
// Same as SHORTEST, but for single-precision floats.
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