From c65d035cc94af8487ae51fd7f26ad53a3588beec Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Thu, 9 May 2019 01:14:46 +0900
Subject: [PATCH] clock: Bug fix: Use float64 not to overflow

Bug: #862
---
 internal/clock/now_windows.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/internal/clock/now_windows.go b/internal/clock/now_windows.go
index 5b23cb25f..7f5799b2e 100644
--- a/internal/clock/now_windows.go
+++ b/internal/clock/now_windows.go
@@ -58,5 +58,7 @@ var (
 func now() int64 {
 	// Use the time duration instead of the current counter to avoid overflow.
 	duration := queryPerformanceCounter() - initCtr
-	return (duration * 1e9) / freq
+
+	// Use float64 not to overflow int64 values (#862).
+	return int64(float64(duration) / float64(freq) * 1e9)
 }