From 059c65a27af538cba40aa43d2eeb3a544661a9b8 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Sun, 28 Dec 2014 06:07:24 -0500
Subject: armemu: Fix underflows in USAD8/USADA8

Initially reported by xdec.
---
 src/core/arm/interpreter/armsupp.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/core/arm/interpreter/armsupp.cpp')

diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp
index 6774f8a7..61639d15 100644
--- a/src/core/arm/interpreter/armsupp.cpp
+++ b/src/core/arm/interpreter/armsupp.cpp
@@ -392,6 +392,15 @@ ARMul_NthReg (ARMword instr, unsigned number)
     return (bit - 1);
 }
 
+/* Unsigned sum of absolute difference */
+u8 ARMul_UnsignedAbsoluteDifference(u8 left, u8 right)
+{
+	if (left > right)
+		return left - right;
+
+	return right - left;
+}
+
 /* Assigns the N and Z flags depending on the value of result.  */
 
 void
-- 
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