1 files changed, 110 insertions, 0 deletions
diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp
index 6774f8a74..8b3661c8f 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
@@ -469,6 +478,107 @@ ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
     ASSIGNV (SubOverflow (a, b, result));
 }
 
+/* 8-bit signed saturated addition */
+u8 ARMul_SignedSaturatedAdd8(u8 left, u8 right)
+{
+    u8 result = left + right;
+
+    if (((result ^ left) & 0x80) && ((left ^ right) & 0x80) == 0) {
+        if (left & 0x80)
+            result = 0x80;
+        else
+            result = 0x7F;
+    }
+
+    return result;
+}
+
+/* 8-bit signed saturated subtraction */
+u8 ARMul_SignedSaturatedSub8(u8 left, u8 right)
+{
+    u8 result = left - right;
+
+    if (((result ^ left) & 0x80) && ((left ^ right) & 0x80) != 0) {
+        if (left & 0x80)
+            result = 0x80;
+        else
+            result = 0x7F;
+    }
+
+    return result;
+}
+
+/* 16-bit signed saturated addition */
+u16 ARMul_SignedSaturatedAdd16(u16 left, u16 right)
+{
+    u16 result = left + right;
+
+    if (((result ^ left) & 0x8000) && ((left ^ right) & 0x8000) == 0) {
+        if (left & 0x8000)
+            result = 0x8000;
+        else
+            result = 0x7FFF;
+    }
+
+    return result;
+}
+
+/* 16-bit signed saturated subtraction */
+u16 ARMul_SignedSaturatedSub16(u16 left, u16 right)
+{
+    u16 result = left - right;
+
+    if (((result ^ left) & 0x8000) && ((left ^ right) & 0x8000) != 0) {
+        if (left & 0x8000)
+            result = 0x8000;
+        else
+            result = 0x7FFF;
+    }
+
+    return result;
+}
+
+/* 8-bit unsigned saturated addition */
+u8 ARMul_UnsignedSaturatedAdd8(u8 left, u8 right)
+{
+    u8 result = left + right;
+
+    if (result < left)
+        result = 0xFF;
+
+    return result;
+}
+
+/* 16-bit unsigned saturated addition */
+u16 ARMul_UnsignedSaturatedAdd16(u16 left, u16 right)
+{
+    u16 result = left + right;
+
+    if (result < left)
+        result = 0xFFFF;
+
+    return result;
+}
+
+/* 8-bit unsigned saturated subtraction */
+u8 ARMul_UnsignedSaturatedSub8(u8 left, u8 right)
+{
+    if (left <= right)
+        return 0;
+
+    return left - right;
+}
+
+/* 16-bit unsigned saturated subtraction */
+u16 ARMul_UnsignedSaturatedSub16(u16 left, u16 right)
+{
+    if (left <= right)
+        return 0;
+
+    return left - right;
+}
+
+
 /* This function does the work of generating the addresses used in an
    LDC instruction.  The code here is always post-indexed, it's up to the
    caller to get the input address correct and to handle base register