From ecccfe033777d6ae7d29bcf0cfc30412f7d3be24 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Fri, 15 Feb 2019 20:04:11 -0400
Subject: Use u128 on Clock Cycles calculation.

---
 src/common/uint128.cpp | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'src/common/uint128.cpp')

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};
 }
 
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