From fcc841eaa1360b8fae961f1c690f9c2ff7bfbd46 Mon Sep 17 00:00:00 2001
From: Nekotekina <nekotekina@gmail.com>
Date: Thu, 14 Nov 2019 19:09:34 +0300
Subject: [PATCH] LLVM: Add workaround for znver2

---
 Utilities/JIT.cpp     | 10 ++++++++--
 Utilities/sysinfo.cpp |  6 ++++++
 Utilities/sysinfo.h   |  2 ++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/Utilities/JIT.cpp b/Utilities/JIT.cpp
index 84a99f2ad2..10d2e635d5 100644
--- a/Utilities/JIT.cpp
+++ b/Utilities/JIT.cpp
@@ -490,7 +490,7 @@ private:
 	};
 
 	Segment m_curr;
-	std::vector<Segment> m_segs;	
+	std::vector<Segment> m_segs;
 };
 
 // Memory manager mutex
@@ -581,7 +581,7 @@ struct MemoryManager : llvm::RTDyldMemoryManager
 			if (m_tramps)
 			{
 				const s64 tramps_diff = u64(m_tramps) - code_start;
-				if (tramps_diff < INT_MIN || tramps_diff > INT_MAX) 
+				if (tramps_diff < INT_MIN || tramps_diff > INT_MAX)
 					m_tramps = nullptr; //previously allocated trampoline section too far away now
 			}
 
@@ -965,6 +965,12 @@ std::string jit_compiler::cpu(const std::string& _cpu)
 				m_cpu = "skylake";
 			}
 		}
+
+		if (m_cpu == "znver1" && utils::has_clwb())
+		{
+			// Upgrade
+			m_cpu = "znver2";
+		}
 	}
 
 	return m_cpu;
diff --git a/Utilities/sysinfo.cpp b/Utilities/sysinfo.cpp
index 2f45f56575..94a138eb9f 100755
--- a/Utilities/sysinfo.cpp
+++ b/Utilities/sysinfo.cpp
@@ -69,6 +69,12 @@ bool utils::has_xop()
 	return g_value;
 }
 
+bool utils::has_clwb()
+{
+	static const bool g_value = get_cpuid(0, 0)[0] >= 0x7 && (get_cpuid(7, 0)[1] & 0x1000000) == 0x1000000;
+	return g_value;
+}
+
 std::string utils::get_system_info()
 {
 	std::string result;
diff --git a/Utilities/sysinfo.h b/Utilities/sysinfo.h
index 7479529544..3eab517be5 100755
--- a/Utilities/sysinfo.h
+++ b/Utilities/sysinfo.h
@@ -45,6 +45,8 @@ namespace utils
 
 	bool has_xop();
 
+	bool has_clwb();
+
 	std::string get_system_info();
 
 	std::string get_firmware_version();