From a77c4f808bc0c2084437300f7e87634bc56971e8 Mon Sep 17 00:00:00 2001
From: nakeee <nakeee@gmail.com>
Date: Tue, 14 Apr 2009 12:37:44 +0000
Subject: [PATCH] guessing unknown extension (seems not to crash anything while
 other guesses did)

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2964 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Core/DSPCore/Src/DSPTables.cpp   |  3 +++
 Source/Core/DSPCore/Src/gdsp_ext_op.cpp | 12 +++++++++++-
 Source/Core/DSPCore/Src/gdsp_ext_op.h   |  1 +
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/Source/Core/DSPCore/Src/DSPTables.cpp b/Source/Core/DSPCore/Src/DSPTables.cpp
index cbd0ed5ea8..747a8978b1 100644
--- a/Source/Core/DSPCore/Src/DSPTables.cpp
+++ b/Source/Core/DSPCore/Src/DSPTables.cpp
@@ -314,6 +314,9 @@ const DSPOPCTemplate cw =
 
 const DSPOPCTemplate opcodes_ext[] =
 {
+	
+	// FIXME: guessing this is cr need checking
+	{"CR",      0x0000, 0x00fc, DSPInterpreter::Ext::cr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
 	{"DR",      0x0004, 0x00fc, DSPInterpreter::Ext::dr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
 	{"IR",      0x0008, 0x00fc, DSPInterpreter::Ext::ir, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
 	{"NR",      0x000c, 0x00fc, DSPInterpreter::Ext::nr, nop, 1, 1, {{P_REG, 1, 0, 0, 0x0003}}, NULL, NULL,},
diff --git a/Source/Core/DSPCore/Src/gdsp_ext_op.cpp b/Source/Core/DSPCore/Src/gdsp_ext_op.cpp
index 57a1b12286..fa9d9692b8 100644
--- a/Source/Core/DSPCore/Src/gdsp_ext_op.cpp
+++ b/Source/Core/DSPCore/Src/gdsp_ext_op.cpp
@@ -35,6 +35,16 @@ namespace DSPInterpreter
 namespace Ext 
 {
 
+// CR $arR
+// xxxx xxxx 0000 00rr
+// Clearing addressing register $arR.
+// This is not in any doc and as such just a guess
+void cr(const UDSPInstruction& opc) {
+	u8 reg = opc.hex & 0x3;	
+	
+	g_dsp.r[reg] = 0;
+}
+
 // DR $arR
 // xxxx xxxx 0000 01rr
 // Decrement addressing register $arR.
@@ -201,7 +211,7 @@ void dsp_op_ext_r_epi(const UDSPInstruction& opc)
 
 	switch (op) {
 	case 0x00: // 
-		ERROR_LOG(DSPLLE, "dsp_op_ext_r_epi");
+		//g_dsp.r[reg] = 0;
 		break;
 		
 	case 0x01: // DR
diff --git a/Source/Core/DSPCore/Src/gdsp_ext_op.h b/Source/Core/DSPCore/Src/gdsp_ext_op.h
index 7040980bd3..6601059fac 100644
--- a/Source/Core/DSPCore/Src/gdsp_ext_op.h
+++ b/Source/Core/DSPCore/Src/gdsp_ext_op.h
@@ -62,6 +62,7 @@ void ldn(const UDSPInstruction& opc);
 void ldm(const UDSPInstruction& opc);
 void ldnm(const UDSPInstruction& opc);
 void mv(const UDSPInstruction& opc);
+void cr(const UDSPInstruction& opc);
 void dr(const UDSPInstruction& opc);
 void ir(const UDSPInstruction& opc);
 void nr(const UDSPInstruction& opc);