diff --git a/DiabloUI/connect.cpp b/DiabloUI/connect.cpp
index b373889f2..1a23a6a80 100644
--- a/DiabloUI/connect.cpp
+++ b/DiabloUI/connect.cpp
@@ -756,16 +756,14 @@ void __fastcall Connect_SetDiffString(_gamedata *gamedata, const char *str1, cha
 	size_t v8;         // eax
 	unsigned char v9;  // zf
 	unsigned char v10; // sf
-	unsigned char v11; // of
 	int v12;           // eax
 
 	v7  = strlen(str1);
 	v8  = v7 + strlen(str2) + 5;
-	v11 = __OFSUB__(size, v8);
 	v9  = size == v8;
 	v10 = (signed int)(size - v8) < 0;
 	v12 = gamedata->bDiff;
-	if ((unsigned char)(v10 ^ v11) | v9)
+	if (v10 | v9)
 		_itoa(v12, str3, 10);
 	else
 		sprintf(str3, "%d\r%s\r%s", v12, str1, str2);
diff --git a/DiabloUI/okcancel.cpp b/DiabloUI/okcancel.cpp
index 13d1e4abe..dc64c2028 100644
--- a/DiabloUI/okcancel.cpp
+++ b/DiabloUI/okcancel.cpp
@@ -218,7 +218,6 @@ void __stdcall UiMessageBoxCallback(HWND hWnd, char *lpText, LPCSTR lpCaption, U
 {
 	int v4;           // eax
 	unsigned char v5; // sf
-	unsigned char v6; // of
 	size_t v7;        // eax
 	char *v8;         // eax
 	int v9;           // ecx
@@ -242,9 +241,8 @@ void __stdcall UiMessageBoxCallback(HWND hWnd, char *lpText, LPCSTR lpCaption, U
 		if (v14 != (char *)0xFF000000)
 			break;
 		v4 = a5[2] + 1;
-		v6 = __OFSUB__(a5[2] + 1, 2);
 		v5 = a5[2]++ - 1 < 0;
-		if (!(v5 ^ v6)) {
+		if (!v5) {
 			v7       = strlen(lpText);
 			v8       = (char *)SMemAlloc(v7 + 256, "C:\\Src\\Diablo\\DiabloUI\\OkCancel.cpp", 392, 0);
 			v11      = 0; /* check */
diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index bfb9f3aaf..f23745854 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -735,8 +735,8 @@ void __fastcall GetMissilePos(int i)
 	int v12; // [esp+Ch] [ebp-8h]
 
 	v1 = i;
-	v2 = SHIWORD(missile[v1]._mityoff);
-	v3 = SHIWORD(missile[v1]._mitxoff);
+	v2 = missile[v1]._mityoff >> 16;
+	v3 = missile[v1]._mitxoff >> 16;
 	v4 = 2 * v2 + v3;
 	v5 = 2 * v2 - v3;
 	if (v4 >= 0) {
@@ -758,7 +758,7 @@ void __fastcall GetMissilePos(int i)
 	}
 	missile[v1]._mix = v8 + missile[v1]._misx;
 	missile[v1]._miy = v11 + missile[v1]._misy;
-	missile[v1]._mixoff = SHIWORD(missile[v1]._mitxoff) + 32 * v11 - 32 * v8;
+	missile[v1]._mixoff = (missile[v1]._mitxoff >> 16) + 32 * v11 - 32 * v8;
 	missile[v1]._miyoff = v2 - 16 * v11 - 16 * v8;
 	ChangeLightOff(missile[v1]._mlid, v12 - 8 * v8, v10 - 8 * v11);
 }
diff --git a/defs.h b/defs.h
index 765aeb3db..40765ca01 100644
--- a/defs.h
+++ b/defs.h
@@ -94,8 +94,6 @@
 #ifndef IDA_GARBAGE
 #define IDA_GARBAGE
 
-typedef __int64 int64;
-
 // Partially defined types. They are used when the decompiler does not know
 // anything about the type except its size.
 #define _BYTE  unsigned char
@@ -113,31 +111,23 @@ typedef __int64 int64;
 #endif
 
 // first unsigned macros:
-#define BYTEn(x, n)   (*((_BYTE*)&(x)+n))
-#define WORDn(x, n)   (*((_WORD*)&(x)+n))
-#define DWORDn(x, n)  (*((_DWORD*)&(x)+n))
-
-#define _LOBYTE(x)  BYTEn(x,LOW_IND(x,_BYTE))
-#define _LOWORD(x)  WORDn(x,LOW_IND(x,_WORD))
-#define _HIBYTE(x)  BYTEn(x,HIGH_IND(x,_BYTE))
-#define _HIWORD(x)  WORDn(x,HIGH_IND(x,_WORD))
+#define BYTEn(x, n)   (*((BYTE*)&(x)+n))
+#define WORDn(x, n)   (*((WORD*)&(x)+n))
+
+#define _LOBYTE(x)  BYTEn(x,LOW_IND(x,BYTE))
+#define _LOWORD(x)  WORDn(x,LOW_IND(x,WORD))
+#define _HIBYTE(x)  BYTEn(x,HIGH_IND(x,BYTE))
+#define _HIWORD(x)  WORDn(x,HIGH_IND(x,WORD))
 #define BYTE1(x)   BYTEn(x,  1)         // byte 1 (counting from 0)
 #define BYTE2(x)   BYTEn(x,  2)
 
-
 // now signed macros (the same but with sign extension)
 #define SBYTEn(x, n)   (*((char*)&(x)+n))
-#define SWORDn(x, n)   (*((short*)&(x)+n))
 
 #define SLOBYTE(x)  SBYTEn(x,LOW_IND(x,char))
-#define SHIWORD(x)  SWORDn(x,HIGH_IND(x,short))
-
 
 // Helper functions to represent some assembly instructions.
 
-#ifdef FAST_MEMCPY
-#define qmemcpy memcpy
-#else
 __inline void *qmemcpy(void *dst, const void *src, size_t cnt)
 {
 	char *out      = (char *)dst;
@@ -148,7 +138,6 @@ __inline void *qmemcpy(void *dst, const void *src, size_t cnt)
 	}
 	return dst;
 }
-#endif
 
 // rotate right
 __inline WORD __ROR2__(WORD value, DWORD count)
@@ -158,34 +147,4 @@ __inline WORD __ROR2__(WORD value, DWORD count)
 	return value >> count | value << (16 - count);
 }
 
-#ifdef __cplusplus
-// sign flag
-template <class T>
-char __SETS__(T x)
-{
-	if (sizeof(T) == 1)
-		return char(x) < 0;
-	if (sizeof(T) == 2)
-		return short(x) < 0;
-	if (sizeof(T) == 4)
-		return int(x) < 0;
-	return int64(x) < 0;
-}
-
-// overflow flag of subtraction (x-y)
-template <class T, class U>
-char __OFSUB__(T x, U y)
-{
-	if (sizeof(T) < sizeof(U)) {
-		U x2    = x;
-		char sx = __SETS__(x2);
-		return (sx ^ __SETS__(y)) & (sx ^ __SETS__(x2 - y));
-	} else {
-		T y2    = y;
-		char sx = __SETS__(x);
-		return (sx ^ __SETS__(y2)) & (sx ^ __SETS__(x - y2));
-	}
-}
-#endif
-
 #endif /* IDA_GARBAGE */