pitrou commented on code in PR #35997:
URL: https://github.com/apache/arrow/pull/35997#discussion_r1229430359
##########
cpp/src/arrow/util/decimal.cc:
##########
@@ -44,195 +45,291 @@ using internal::SafeLeftShift;
using internal::SafeSignedAdd;
using internal::uint128_t;
-Decimal128::Decimal128(const std::string& str) : Decimal128() {
- *this = Decimal128::FromString(str).ValueOrDie();
-}
+namespace {
-static constexpr auto kInt64DecimalDigits =
- static_cast<size_t>(std::numeric_limits<int64_t>::digits10);
-
-static constexpr uint64_t kUInt64PowersOfTen[kInt64DecimalDigits + 1] = {
- // clang-format off
- 1ULL,
- 10ULL,
- 100ULL,
- 1000ULL,
- 10000ULL,
- 100000ULL,
- 1000000ULL,
- 10000000ULL,
- 100000000ULL,
- 1000000000ULL,
- 10000000000ULL,
- 100000000000ULL,
- 1000000000000ULL,
- 10000000000000ULL,
- 100000000000000ULL,
- 1000000000000000ULL,
- 10000000000000000ULL,
- 100000000000000000ULL,
- 1000000000000000000ULL
- // clang-format on
+struct BaseDecimalRealConversion {
+ // Return 10**exp, with a fast lookup, assuming `exp` is withing bounds
+ template <typename Real>
+ static Real PowerOfTen(int32_t exp) {
+ DCHECK(exp >= -76 && exp <= 76);
Review Comment:
Good idea, will do.
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