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-rw-r--r--src/common/uint128.cpp24
1 files changed, 23 insertions, 1 deletions
diff --git a/src/common/uint128.cpp b/src/common/uint128.cpp
index aea7f03e2..8548ba808 100644
--- a/src/common/uint128.cpp
+++ b/src/common/uint128.cpp
@@ -1,7 +1,25 @@
+#ifdef _MSC_VER
+#include <intrin.h>
+
+#pragma intrinsic(_umul128)
+#endif
+#include "common/uint128.h"
namespace Common {
+u128 Multiply64Into128(u64 a, u64 b) {
+#ifdef _MSC_VER
+ u128 result;
+ result[0] = _umul128(a, b, &result[1]);
+#else
+ unsigned __int128 tmp = a;
+ tmp *= b;
+ u128 result;
+ std::memcpy(&result, &tmp, sizeof(u128));
+#endif
+ return result;
+}
-std::pair<u64, u64> udiv128(u128 dividend, u64 divisor) {
+std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor) {
u64 remainder = dividend[0] % divisor;
u64 accum = dividend[0] / divisor;
if (dividend[1] == 0)
@@ -12,6 +30,10 @@ std::pair<u64, u64> udiv128(u128 dividend, u64 divisor) {
u64 second_segment = (first_segment % divisor) << 32;
accum += (second_segment / divisor);
remainder += second_segment % divisor;
+ if (remainder >= divisor) {
+ accum++;
+ remainder -= divisor;
+ }
return {accum, remainder};
}