From 8f26e128bffed08444888733d57168d83d7a538e Mon Sep 17 00:00:00 2001
From: Henrik Rydgard <hrydgard@gmail.com>
Date: Fri, 4 Jan 2013 00:32:18 +0100
Subject: [PATCH] Ignore bogus invalidate cache calls, fixes slowdown in some
 games

---
 Core/HLE/sceKernel.cpp | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/Core/HLE/sceKernel.cpp b/Core/HLE/sceKernel.cpp
index e21876fd41..7aab757c54 100644
--- a/Core/HLE/sceKernel.cpp
+++ b/Core/HLE/sceKernel.cpp
@@ -241,24 +241,30 @@ void sceKernelGetGPI()
 // textures, and in the future display lists, in some cases though.
 int sceKernelDcacheInvalidateRange(u32 addr, int size)
 {
-	gpu->InvalidateCache(addr, size);
+	if (size > 0 && addr != 0) {
+		gpu->InvalidateCache(addr, size);
+	}
 	return 0;
 }
 int sceKernelDcacheWritebackAll()
 {
-  // Some games seem to use this a lot, it doesn't make sense
+	// Some games seem to use this a lot, it doesn't make sense
   // to zap the whole texture cache.
 	// gpu->InvalidateCache(0, -1);
 	return 0;
 }
 int sceKernelDcacheWritebackRange(u32 addr, int size)
 {
-	gpu->InvalidateCache(addr, size);
+	if (size > 0 && addr != 0) {
+		gpu->InvalidateCache(addr, size);
+	}
 	return 0;
 }
 int sceKernelDcacheWritebackInvalidateRange(u32 addr, int size)
 {
-	gpu->InvalidateCache(addr, size);
+	if (size > 0 && addr != 0) {
+		gpu->InvalidateCache(addr, size);
+	}
 	return 0;
 }
 int sceKernelDcacheWritebackInvalidateAll()