From ff09ef9263db156db973e75bf78b24a9e10826ee Mon Sep 17 00:00:00 2001
From: Michal Mrozek <michal.mrozek@intel.com>
Date: Thu, 12 Mar 2020 10:56:12 +0100
Subject: [PATCH] Prevent "0" as delta.

Change-Id: Ic0fae0ff816c6c587eb37b43462455f86cf3628c
Signed-off-by: Michal Mrozek <michal.mrozek@intel.com>
---
 shared/source/os_interface/windows/wddm_memory_manager.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/shared/source/os_interface/windows/wddm_memory_manager.cpp b/shared/source/os_interface/windows/wddm_memory_manager.cpp
index 50a1870f0e..be5eaa22e3 100644
--- a/shared/source/os_interface/windows/wddm_memory_manager.cpp
+++ b/shared/source/os_interface/windows/wddm_memory_manager.cpp
@@ -603,7 +603,7 @@ bool WddmMemoryManager::isCpuCopyRequired(const void *ptr) {
     timestamp1 = __rdtsc();
     _mm_lfence();
     localVariableReadDelta = timestamp1 - timestamp0 - meassurmentOverhead;
-    if (localVariableReadDelta < 0) {
+    if (localVariableReadDelta <= 0) {
         localVariableReadDelta = 1;
     }
     if (localVariableReadDelta < fastestLocalRead) {
@@ -620,7 +620,7 @@ bool WddmMemoryManager::isCpuCopyRequired(const void *ptr) {
     timestamp1 = __rdtsc();
     _mm_lfence();
     inputPointerReadDelta = timestamp1 - timestamp0 - meassurmentOverhead;
-    if (inputPointerReadDelta < 0) {
+    if (inputPointerReadDelta <= 0) {
         inputPointerReadDelta = 1;
     }
     return inputPointerReadDelta > slownessFactor * fastestLocalRead;