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Changes imported from Abseil "staging" branch:

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- c77facb7ba7c12d656e213e5d63d7dcd9d1f56ba Present the Writer* methods as an option, rather than an ... by Abseil Team <absl-team@google.com>
  - c6004d718f185868dee2ec48b4de6425399b062d Split exception_safety_testing out into its own cmake rul... by Jon Cohen <cohenjon@google.com>
  - 9aa6fc7b34674472d808ed8021f3b20faea82f78 Downstream https://github.com/abseil/abseil-cpp/pull/69 by Jon Cohen <cohenjon@google.com>
  - 13d340269f284b815cc409d2271099e535f4cba4 Internal change by Jon Cohen <cohenjon@google.com>
  - 51840a9243ac9d47eb3c177398d10bb3341f3230 Fix assertion in conversion from floating point types to ... by Alex Strelnikov <strel@google.com>

GitOrigin-RevId: c77facb7ba7c12d656e213e5d63d7dcd9d1f56ba
Change-Id: I7590561b04a986ffbec7139bb9c3aea319a3b975
This commit is contained in:
Abseil Team 2018-01-30 13:05:25 -08:00 • committed by Jon Cohen
parent e5c6ee2d00
commit f4f238b09b
7 changed files with 34 additions and 19 deletions
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14
absl/numeric/int128.cc
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@ -104,11 +104,15 @@ void DivModImpl(uint128 dividend, uint128 divisor, uint128* quotient_ret,
}
template <typename T>
uint128 Initialize128FromFloat(T v) {
uint128 MakeUint128FromFloat(T v) {
static_assert(std::is_floating_point<T>::value, "");
// Rounding behavior is towards zero, same as for built-in types.
// Undefined behavior if v is NaN or cannot fit into uint128.
assert(!std::isnan(v) && v > -1 && v < std::ldexp(static_cast<T>(1), 128));
assert(std::isfinite(v) && v > -1 &&
(std::numeric_limits<T>::max_exponent <= 128 ||
v < std::ldexp(static_cast<T>(1), 128)));
if (v >= std::ldexp(static_cast<T>(1), 64)) {
uint64_t hi = static_cast<uint64_t>(std::ldexp(v, -64));
@ -120,9 +124,9 @@ uint128 Initialize128FromFloat(T v) {
}
} // namespace
uint128::uint128(float v) : uint128(Initialize128FromFloat(v)) {}
uint128::uint128(double v) : uint128(Initialize128FromFloat(v)) {}
uint128::uint128(long double v) : uint128(Initialize128FromFloat(v)) {}
uint128::uint128(float v) : uint128(MakeUint128FromFloat(v)) {}
uint128::uint128(double v) : uint128(MakeUint128FromFloat(v)) {}
uint128::uint128(long double v) : uint128(MakeUint128FromFloat(v)) {}
uint128& uint128::operator/=(uint128 other) {
uint128 quotient = 0;