From d4f871cb6a616f6b1a8a76049e042118571f3dd3 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Fri, 1 Jan 2021 23:28:55 +0100
Subject: X86/NativeClock: Improve performance of clock calculations on hot
 path.

---
 src/common/x64/native_clock.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/common/x64/native_clock.h')

diff --git a/src/common/x64/native_clock.h b/src/common/x64/native_clock.h
index 6d1e32ac8..a7b1ee9e0 100644
--- a/src/common/x64/native_clock.h
+++ b/src/common/x64/native_clock.h
@@ -41,6 +41,13 @@ private:
     u64 last_measure{};
     u64 accumulated_ticks{};
     u64 rtsc_frequency;
+
+    // factors
+    u64 ns_rtsc_factor{};
+    u64 us_rtsc_factor{};
+    u64 ms_rtsc_factor{};
+    u64 clock_rtsc_factor{};
+    u64 cpu_rtsc_factor{};
 };
 } // namespace X64
 
-- 
cgit v1.2.3


From 53d92318b82cd4a9e08f814fcb8aab624d795c6c Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Sat, 2 Jan 2021 02:24:49 +0100
Subject: X86/NativeClock: Reimplement RTDSC access to be lock free.

---
 src/common/x64/native_clock.h | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

(limited to 'src/common/x64/native_clock.h')

diff --git a/src/common/x64/native_clock.h b/src/common/x64/native_clock.h
index a7b1ee9e0..7cbd400d2 100644
--- a/src/common/x64/native_clock.h
+++ b/src/common/x64/native_clock.h
@@ -6,7 +6,6 @@
 
 #include <optional>
 
-#include "common/spin_lock.h"
 #include "common/wall_clock.h"
 
 namespace Common {
@@ -32,22 +31,29 @@ public:
 private:
     u64 GetRTSC();
 
+    union alignas(16) TimePoint {
+        TimePoint() : pack{} {}
+        u128 pack{};
+        struct Inner {
+            u64 last_measure{};
+            u64 accumulated_ticks{};
+        } inner;
+    };
+
     /// value used to reduce the native clocks accuracy as some apss rely on
     /// undefined behavior where the level of accuracy in the clock shouldn't
     /// be higher.
     static constexpr u64 inaccuracy_mask = ~(UINT64_C(0x400) - 1);
 
-    SpinLock rtsc_serialize{};
-    u64 last_measure{};
-    u64 accumulated_ticks{};
-    u64 rtsc_frequency;
-
+    TimePoint time_point;
     // factors
+    u64 clock_rtsc_factor{};
+    u64 cpu_rtsc_factor{};
     u64 ns_rtsc_factor{};
     u64 us_rtsc_factor{};
     u64 ms_rtsc_factor{};
-    u64 clock_rtsc_factor{};
-    u64 cpu_rtsc_factor{};
+
+    u64 rtsc_frequency;
 };
 } // namespace X64
 
-- 
cgit v1.2.3