From b1ffd32f5f09a86598bb47c4b392b28354ed0a87 Mon Sep 17 00:00:00 2001
From: degasus <wickmarkus@web.de>
Date: Sat, 14 Mar 2015 08:02:16 +0100
Subject: [PATCH] Fifo: only touch the SIMD state once in the single core loop

---
 Source/Core/VideoCommon/Fifo.cpp | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Source/Core/VideoCommon/Fifo.cpp b/Source/Core/VideoCommon/Fifo.cpp
index add7618d5d..c9ac3fdbbb 100644
--- a/Source/Core/VideoCommon/Fifo.cpp
+++ b/Source/Core/VideoCommon/Fifo.cpp
@@ -425,6 +425,7 @@ void RunGpu()
 	// execute GPU
 	if (!SConfig::GetInstance().m_LocalCoreStartupParameter.bCPUThread || g_use_deterministic_gpu_thread)
 	{
+		bool reset_simd_state = false;
 		while (fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint() )
 		{
 			if (g_use_deterministic_gpu_thread)
@@ -433,11 +434,14 @@ void RunGpu()
 			}
 			else
 			{
-				FPURoundMode::SaveSIMDState();
-				FPURoundMode::LoadDefaultSIMDState();
+				if (!reset_simd_state)
+				{
+					FPURoundMode::SaveSIMDState();
+					FPURoundMode::LoadDefaultSIMDState();
+					reset_simd_state = true;
+				}
 				ReadDataFromFifo(fifo.CPReadPointer);
 				s_video_buffer_read_ptr = OpcodeDecoder_Run(DataReader(s_video_buffer_read_ptr, s_video_buffer_write_ptr), nullptr, false);
-				FPURoundMode::LoadSIMDState();
 			}
 
 			//DEBUG_LOG(COMMANDPROCESSOR, "Fifo wraps to base");
@@ -450,6 +454,11 @@ void RunGpu()
 			fifo.CPReadWriteDistance -= 32;
 		}
 		CommandProcessor::SetCPStatusFromGPU();
+
+		if (reset_simd_state)
+		{
+			FPURoundMode::LoadSIMDState();
+		}
 	}
 
 	// wake up GPU thread