From 3ea48e8ebe25686f2342cd79b32409fcd1bccb28 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow
Date: Fri, 15 Feb 2019 19:26:41 -0400
Subject: Implement 128 bits Unsigned Integer Multiplication and Division.

---
 src/common/uint128.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/common/uint128.h

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

diff --git a/src/common/uint128.h b/src/common/uint128.h
new file mode 100644
index 000000000..fda313bcc
--- /dev/null
+++ b/src/common/uint128.h
@@ -0,0 +1,30 @@
+#include <array>
+#include <cstdint>
+#include <utility>
+#include <cstring>
+#include "common/common_types.h"
+
+namespace Common {
+
+#ifdef _MSC_VER
+#include <intrin.h>
+
+#pragma intrinsic(_umul128)
+#endif
+
+inline u128 umul128(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);
+
+} // namespace Common
-- 
cgit v1.2.3


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

---
 src/common/uint128.h | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

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

diff --git a/src/common/uint128.h b/src/common/uint128.h
index fda313bcc..45e384c33 100644
--- a/src/common/uint128.h
+++ b/src/common/uint128.h
@@ -1,30 +1,13 @@
 #include <array>
 #include <cstdint>
-#include <utility>
 #include <cstring>
+#include <utility>
 #include "common/common_types.h"
 
 namespace Common {
 
-#ifdef _MSC_VER
-#include <intrin.h>
-
-#pragma intrinsic(_umul128)
-#endif
-
-inline u128 umul128(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;
-}
+u128 Multiply64Into128(u64 a, u64 b);
 
-std::pair<u64, u64> udiv128(u128 dividend, u64 divisor);
+std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor);
 
 } // namespace Common
-- 
cgit v1.2.3


From a8d4927e29bb1acbf5f3267f368801847acd4222 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow
Date: Sat, 16 Feb 2019 16:52:24 -0400
Subject: Corrections, documenting and fixes.

---
 src/common/uint128.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

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

diff --git a/src/common/uint128.h b/src/common/uint128.h
index 45e384c33..52e6b46eb 100644
--- a/src/common/uint128.h
+++ b/src/common/uint128.h
@@ -1,13 +1,14 @@
-#include <array>
-#include <cstdint>
-#include <cstring>
+
 #include <utility>
 #include "common/common_types.h"
 
 namespace Common {
 
+// This function multiplies 2 u64 values and produces a u128 value;
 u128 Multiply64Into128(u64 a, u64 b);
 
-std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor);
+// This function divides a u128 by a u32 value and produces two u64 values:
+// the result of division and the remainder
+std::pair<u64, u64> Divide128On32(u128 dividend, u32 divisor);
 
 } // namespace Common
-- 
cgit v1.2.3