diff options
Diffstat (limited to 'absl/numeric/int128.h')
| -rw-r--r-- | absl/numeric/int128.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/absl/numeric/int128.h b/absl/numeric/int128.h index 5d14a4a8..9c2e00f6 100644 --- a/absl/numeric/int128.h +++ b/absl/numeric/int128.h @@ -37,6 +37,11 @@ #include "absl/base/macros.h" #include "absl/base/port.h" +#if defined(_MSC_VER) && defined(_WIN64) +#include <intrin.h> +#pragma intrinsic(_umul128) +#endif // defined(_MSC_VER) && defined(_WIN64) + namespace absl { @@ -661,6 +666,12 @@ inline uint128 operator*(uint128 lhs, uint128 rhs) { // can be used for uint128 storage. return static_cast<unsigned __int128>(lhs) * static_cast<unsigned __int128>(rhs); +#elif defined(_MSC_VER) && defined(_WIN64) + uint64_t carry; + uint64_t low = _umul128(Uint128Low64(lhs), Uint128Low64(rhs), &carry); + return MakeUint128(Uint128Low64(lhs) * Uint128High64(rhs) + + Uint128High64(lhs) * Uint128Low64(rhs) + carry, + low); #else // ABSL_HAVE_INTRINSIC128 uint64_t a32 = Uint128Low64(lhs) >> 32; uint64_t a00 = Uint128Low64(lhs) & 0xffffffff; |