[PATCH 1/6] ntdll/tests: Fix tick count read from user shared data.

[Rémi Bernon]

Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
---

This is some tests to validate that RtlQueryPerformanceCounter should
be able to bypass NtQueryPerformanceCounter syscall and be optimised
with rdtsc(p). The XSTATE save and restore is making its syscall much
slower than it was before, and some applications are now burning CPU
calling Qpc in a tight loop.

It also looks like that there's a new shared page in town since w10v1809
and it's pretty much undocumented. On previous versions the bypass is
not always enabled, and it's for instance not enabled on the testbot VMs
but I was able to test it in a local VM with w10v1511, and it only seems
to be using the USD values.

 dlls/ntdll/tests/time.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/tests/time.c b/dlls/ntdll/tests/time.c
index d756a8c839c..931bf765aa7 100644
--- a/dlls/ntdll/tests/time.c
+++ b/dlls/ntdll/tests/time.c
@@ -206,9 +206,9 @@ static void test_user_shared_data_time(void)
     {
         t1 = GetTickCount();
         if (user_shared_data->NtMajorVersion <= 5 && user_shared_data->NtMinorVersion <= 1)
-            t2 = (*(volatile ULONG*)&user_shared_data->TickCountLowDeprecated * (ULONG64)user_shared_data->TickCountMultiplier) >> 24;
+            t2 = (DWORD)((*(volatile ULONG*)&user_shared_data->TickCountLowDeprecated * (ULONG64)user_shared_data->TickCountMultiplier) >> 24);
         else
-            t2 = (read_ksystem_time(&user_shared_data->u.TickCount) * user_shared_data->TickCountMultiplier) >> 24;
+            t2 = (DWORD)((read_ksystem_time(&user_shared_data->u.TickCount) * user_shared_data->TickCountMultiplier) >> 24);
         t3 = GetTickCount();
     } while(t3 < t1 && i++ < 1); /* allow for wrap, but only once */
 
-- 
2.30.0