From ce992ee01f19e9615f43f6dbbdceb370223a09e6 Mon Sep 17 00:00:00 2001
From: Mozzg <operationm@list.ru>
Date: Mon, 29 Mar 2021 19:24:55 +0300
Subject: [PATCH] Fix overflow when calculating time value for Clock

---
 src/SFML/System/Win32/ClockImpl.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/SFML/System/Win32/ClockImpl.cpp b/src/SFML/System/Win32/ClockImpl.cpp
index d8d06b57e..2f69ece62 100644
--- a/src/SFML/System/Win32/ClockImpl.cpp
+++ b/src/SFML/System/Win32/ClockImpl.cpp
@@ -54,9 +54,9 @@ namespace priv
 ////////////////////////////////////////////////////////////
 Time ClockImpl::getCurrentTime()
 {
-    // Get the frequency of the performance counter
-    // (it is constant across the program lifetime)
-    static LARGE_INTEGER frequency = getFrequency();
+    // Calculate inverse of frequency multiplied by 1000000 to prevent overflow in final calculation
+    // Frequency is constant across the program lifetime
+    static double inverse = 1000000.0 / getFrequency().QuadPart;
 
     // Detect if we are on Windows XP or older
     static bool oldWindows = isWindowsXpOrOlder();
@@ -80,7 +80,7 @@ Time ClockImpl::getCurrentTime()
     }
 
     // Return the current time as microseconds
-    return sf::microseconds(1000000 * time.QuadPart / frequency.QuadPart);
+    return sf::microseconds(static_cast<sf::Int64>(time.QuadPart * inverse));
 }
 
 } // namespace priv