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Merge pull request #243 from ThomsonTan/FixIntrinsic

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_umul128 intrinsic is x64 only and not available on Windows ARM64
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Alex Strelnikov 2019-01-09 12:55:48 -05:00 • committed by GitHub
commit 9449ae9439
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1 changed files with 3 additions and 3 deletions
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6
absl/numeric/int128.h
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@ -43,10 +43,10 @@
// builtin type. We need to make sure not to define operator wchar_t() // builtin type. We need to make sure not to define operator wchar_t()
// alongside operator unsigned short() in these instances. // alongside operator unsigned short() in these instances.
#define ABSL_INTERNAL_WCHAR_T __wchar_t #define ABSL_INTERNAL_WCHAR_T __wchar_t
#if defined(_WIN64) #if defined(_M_X64)
#include <intrin.h> #include <intrin.h>
#pragma intrinsic(_umul128) #pragma intrinsic(_umul128)
#endif // defined(_WIN64) #endif // defined(_M_X64)
#else // defined(_MSC_VER) #else // defined(_MSC_VER)
#define ABSL_INTERNAL_WCHAR_T wchar_t #define ABSL_INTERNAL_WCHAR_T wchar_t
#endif // defined(_MSC_VER) #endif // defined(_MSC_VER)
@ -675,7 +675,7 @@ inline uint128 operator*(uint128 lhs, uint128 rhs) {
// can be used for uint128 storage. // can be used for uint128 storage.
return static_cast<unsigned __int128>(lhs) * return static_cast<unsigned __int128>(lhs) *
static_cast<unsigned __int128>(rhs); static_cast<unsigned __int128>(rhs);
#elif defined(_MSC_VER) && defined(_WIN64) #elif defined(_MSC_VER) && defined(_M_X64)
uint64_t carry; uint64_t carry;
uint64_t low = _umul128(Uint128Low64(lhs), Uint128Low64(rhs), &carry); uint64_t low = _umul128(Uint128Low64(lhs), Uint128Low64(rhs), &carry);
return MakeUint128(Uint128Low64(lhs) * Uint128High64(rhs) + return MakeUint128(Uint128Low64(lhs) * Uint128High64(rhs) +