From 80217a6ed718d15c75784090340cd3ddd9432f96 Mon Sep 17 00:00:00 2001
From: hrydgard <hrydgard@gmail.com>
Date: Sun, 21 Jun 2009 06:56:44 +0000
Subject: [PATCH] DSP: Fix the invalid memory accesses that the Zelda Ucode
 does in LLE. No LLE sound yet but at least no crazy errors :p

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3516 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 Source/Core/DSPCore/Src/DspIntMisc.cpp        |  6 +++++-
 Source/Core/DSPCore/Src/gdsp_opcodes_helper.h | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/Source/Core/DSPCore/Src/DspIntMisc.cpp b/Source/Core/DSPCore/Src/DspIntMisc.cpp
index ef1680321b..732739c0f1 100644
--- a/Source/Core/DSPCore/Src/DspIntMisc.cpp
+++ b/Source/Core/DSPCore/Src/DspIntMisc.cpp
@@ -97,7 +97,11 @@ void addarn(const UDSPInstruction& opc)
 	u8 dreg = opc.hex & 0x3;
 	u8 sreg = (opc.hex >> 2) & 0x3;
 
-	g_dsp.r[dreg] += (s16)g_dsp.r[DSP_REG_IX0 + sreg];
+	// g_dsp.r[dreg] += (s16)g_dsp.r[DSP_REG_IX0 + sreg];
+
+	dsp_increase_addr_reg(dreg, (s16)g_dsp.r[DSP_REG_IX0 + sreg]);
+
+	// It is critical for the Zelda ucode that this one wraps correctly.
 }
 
 // NX
diff --git a/Source/Core/DSPCore/Src/gdsp_opcodes_helper.h b/Source/Core/DSPCore/Src/gdsp_opcodes_helper.h
index 00f8d7c6b7..2936c1f512 100644
--- a/Source/Core/DSPCore/Src/gdsp_opcodes_helper.h
+++ b/Source/Core/DSPCore/Src/gdsp_opcodes_helper.h
@@ -82,6 +82,20 @@ inline void dsp_increment_addr_reg(int reg)
 		g_dsp.r[reg]++;
 }
 
+inline void dsp_increase_addr_reg(int reg, s16 value)
+{
+	// TODO: DO RIGHT!
+	if (value > 0) {
+		for (int i = 0; i < value; i++) {
+			dsp_increment_addr_reg(reg);
+		}
+	} else if (value < 0) {
+		for (int i = 0; i < (int)(-value); i++) {
+			dsp_decrement_addr_reg(reg);
+		}
+	}
+}
+
 
 // ---------------------------------------------------------------------------------------
 // --- reg