diff --git a/src/test/java/dk/camelot64/kickc/test/kc/bool-min.kc b/src/test/java/dk/camelot64/kickc/test/kc/bool-min.kc
index 250bad687..341addd12 100644
--- a/src/test/java/dk/camelot64/kickc/test/kc/bool-min.kc
+++ b/src/test/java/dk/camelot64/kickc/test/kc/bool-min.kc
@@ -22,9 +22,9 @@ void bool_const_if() {
 // A bunch of constant boolean vars (used in an if)
 void bool_const_vars() {
     byte a = 14;
-    boolean b1 = (a==15);
-    boolean b2 = 21 < a;
-    boolean b = b1 || b2;
+    boolean b1 = (a==15) || !(21<a);
+    boolean b2 = (a!=44) || (a>=-8);
+    boolean b = b1 && !b2 || false;
     if(b) {
         SCREEN[1] = 't';
     } else {
diff --git a/src/test/java/dk/camelot64/kickc/test/ref/bool-min.log b/src/test/java/dk/camelot64/kickc/test/ref/bool-min.log
index 4eb63fa3c..0dfbdddc4 100644
--- a/src/test/java/dk/camelot64/kickc/test/ref/bool-min.log
+++ b/src/test/java/dk/camelot64/kickc/test/ref/bool-min.log
@@ -23,9 +23,9 @@ void bool_const_if() {
 // A bunch of constant boolean vars (used in an if)
 void bool_const_vars() {
     byte a = 14;
-    boolean b1 = (a==15);
-    boolean b2 = 21 < a;
-    boolean b = b1 || b2;
+    boolean b1 = (a==15) || !(21<a);
+    boolean b2 = (a!=44) || (a>=-8);
+    boolean b = b1 && !b2 || false;
     if(b) {
         SCREEN[1] = 't';
     } else {
@@ -56,13 +56,21 @@ endproc // bool_const_if()
 proc (void()) bool_const_vars()
   (byte) bool_const_vars::a ← (byte/signed byte/word/signed word/dword/signed dword) 14
   (boolean~) bool_const_vars::$0 ← (byte) bool_const_vars::a == (byte/signed byte/word/signed word/dword/signed dword) 15
-  (boolean) bool_const_vars::b1 ← (boolean~) bool_const_vars::$0
   (boolean~) bool_const_vars::$1 ← (byte/signed byte/word/signed word/dword/signed dword) 21 < (byte) bool_const_vars::a
-  (boolean) bool_const_vars::b2 ← (boolean~) bool_const_vars::$1
-  (boolean~) bool_const_vars::$2 ← (boolean) bool_const_vars::b1 || (boolean) bool_const_vars::b2
-  (boolean) bool_const_vars::b ← (boolean~) bool_const_vars::$2
-  (boolean~) bool_const_vars::$3 ← ! (boolean) bool_const_vars::b
-  if((boolean~) bool_const_vars::$3) goto bool_const_vars::@1
+  (boolean~) bool_const_vars::$2 ← ! (boolean~) bool_const_vars::$1
+  (boolean~) bool_const_vars::$3 ← (boolean~) bool_const_vars::$0 || (boolean~) bool_const_vars::$2
+  (boolean) bool_const_vars::b1 ← (boolean~) bool_const_vars::$3
+  (boolean~) bool_const_vars::$4 ← (byte) bool_const_vars::a != (byte/signed byte/word/signed word/dword/signed dword) 44
+  (signed byte/signed word/signed dword~) bool_const_vars::$5 ← - (byte/signed byte/word/signed word/dword/signed dword) 8
+  (boolean~) bool_const_vars::$6 ← (byte) bool_const_vars::a >= (signed byte/signed word/signed dword~) bool_const_vars::$5
+  (boolean~) bool_const_vars::$7 ← (boolean~) bool_const_vars::$4 || (boolean~) bool_const_vars::$6
+  (boolean) bool_const_vars::b2 ← (boolean~) bool_const_vars::$7
+  (boolean~) bool_const_vars::$8 ← ! (boolean) bool_const_vars::b2
+  (boolean~) bool_const_vars::$9 ← (boolean) bool_const_vars::b1 && (boolean~) bool_const_vars::$8
+  (boolean~) bool_const_vars::$10 ← (boolean~) bool_const_vars::$9 || false
+  (boolean) bool_const_vars::b ← (boolean~) bool_const_vars::$10
+  (boolean~) bool_const_vars::$11 ← ! (boolean) bool_const_vars::b
+  if((boolean~) bool_const_vars::$11) goto bool_const_vars::@1
   *((byte*) SCREEN + (byte/signed byte/word/signed word/dword/signed dword) 1) ← (byte) 't'
   goto bool_const_vars::@2
 bool_const_vars::@1:
@@ -84,8 +92,16 @@ SYMBOLS
 (void()) bool_const_vars()
 (boolean~) bool_const_vars::$0
 (boolean~) bool_const_vars::$1
+(boolean~) bool_const_vars::$10
+(boolean~) bool_const_vars::$11
 (boolean~) bool_const_vars::$2
 (boolean~) bool_const_vars::$3
+(boolean~) bool_const_vars::$4
+(signed byte/signed word/signed dword~) bool_const_vars::$5
+(boolean~) bool_const_vars::$6
+(boolean~) bool_const_vars::$7
+(boolean~) bool_const_vars::$8
+(boolean~) bool_const_vars::$9
 (label) bool_const_vars::@1
 (label) bool_const_vars::@2
 (label) bool_const_vars::@return
@@ -135,13 +151,21 @@ bool_const_if::@return: scope:[bool_const_if]  from bool_const_if::@2
 bool_const_vars: scope:[bool_const_vars]  from
   (byte) bool_const_vars::a ← (byte/signed byte/word/signed word/dword/signed dword) 14
   (boolean~) bool_const_vars::$0 ← (byte) bool_const_vars::a == (byte/signed byte/word/signed word/dword/signed dword) 15
-  (boolean) bool_const_vars::b1 ← (boolean~) bool_const_vars::$0
   (boolean~) bool_const_vars::$1 ← (byte/signed byte/word/signed word/dword/signed dword) 21 < (byte) bool_const_vars::a
-  (boolean) bool_const_vars::b2 ← (boolean~) bool_const_vars::$1
-  (boolean~) bool_const_vars::$2 ← (boolean) bool_const_vars::b1 || (boolean) bool_const_vars::b2
-  (boolean) bool_const_vars::b ← (boolean~) bool_const_vars::$2
-  (boolean~) bool_const_vars::$3 ← ! (boolean) bool_const_vars::b
-  if((boolean~) bool_const_vars::$3) goto bool_const_vars::@1
+  (boolean~) bool_const_vars::$2 ← ! (boolean~) bool_const_vars::$1
+  (boolean~) bool_const_vars::$3 ← (boolean~) bool_const_vars::$0 || (boolean~) bool_const_vars::$2
+  (boolean) bool_const_vars::b1 ← (boolean~) bool_const_vars::$3
+  (boolean~) bool_const_vars::$4 ← (byte) bool_const_vars::a != (byte/signed byte/word/signed word/dword/signed dword) 44
+  (signed byte/signed word/signed dword~) bool_const_vars::$5 ← - (byte/signed byte/word/signed word/dword/signed dword) 8
+  (boolean~) bool_const_vars::$6 ← (byte) bool_const_vars::a >= (signed byte/signed word/signed dword~) bool_const_vars::$5
+  (boolean~) bool_const_vars::$7 ← (boolean~) bool_const_vars::$4 || (boolean~) bool_const_vars::$6
+  (boolean) bool_const_vars::b2 ← (boolean~) bool_const_vars::$7
+  (boolean~) bool_const_vars::$8 ← ! (boolean) bool_const_vars::b2
+  (boolean~) bool_const_vars::$9 ← (boolean) bool_const_vars::b1 && (boolean~) bool_const_vars::$8
+  (boolean~) bool_const_vars::$10 ← (boolean~) bool_const_vars::$9 || false
+  (boolean) bool_const_vars::b ← (boolean~) bool_const_vars::$10
+  (boolean~) bool_const_vars::$11 ← ! (boolean) bool_const_vars::b
+  if((boolean~) bool_const_vars::$11) goto bool_const_vars::@1
   to:bool_const_vars::@3
 bool_const_vars::@1: scope:[bool_const_vars]  from bool_const_vars bool_const_vars::@4
   *((byte*) SCREEN + (byte/signed byte/word/signed word/dword/signed dword) 1) ← (byte) 'f'
@@ -205,13 +229,21 @@ bool_const_if::@return: scope:[bool_const_if]  from bool_const_if::@1 bool_const
 bool_const_vars: scope:[bool_const_vars]  from main::@1
   (byte) bool_const_vars::a#0 ← (byte/signed byte/word/signed word/dword/signed dword) 14
   (boolean~) bool_const_vars::$0 ← (byte) bool_const_vars::a#0 == (byte/signed byte/word/signed word/dword/signed dword) 15
-  (boolean) bool_const_vars::b1#0 ← (boolean~) bool_const_vars::$0
   (boolean~) bool_const_vars::$1 ← (byte/signed byte/word/signed word/dword/signed dword) 21 < (byte) bool_const_vars::a#0
-  (boolean) bool_const_vars::b2#0 ← (boolean~) bool_const_vars::$1
-  (boolean~) bool_const_vars::$2 ← (boolean) bool_const_vars::b1#0 || (boolean) bool_const_vars::b2#0
-  (boolean) bool_const_vars::b#0 ← (boolean~) bool_const_vars::$2
-  (boolean~) bool_const_vars::$3 ← ! (boolean) bool_const_vars::b#0
-  if((boolean~) bool_const_vars::$3) goto bool_const_vars::@1
+  (boolean~) bool_const_vars::$2 ← ! (boolean~) bool_const_vars::$1
+  (boolean~) bool_const_vars::$3 ← (boolean~) bool_const_vars::$0 || (boolean~) bool_const_vars::$2
+  (boolean) bool_const_vars::b1#0 ← (boolean~) bool_const_vars::$3
+  (boolean~) bool_const_vars::$4 ← (byte) bool_const_vars::a#0 != (byte/signed byte/word/signed word/dword/signed dword) 44
+  (signed byte/signed word/signed dword~) bool_const_vars::$5 ← - (byte/signed byte/word/signed word/dword/signed dword) 8
+  (boolean~) bool_const_vars::$6 ← (byte) bool_const_vars::a#0 >= (signed byte/signed word/signed dword~) bool_const_vars::$5
+  (boolean~) bool_const_vars::$7 ← (boolean~) bool_const_vars::$4 || (boolean~) bool_const_vars::$6
+  (boolean) bool_const_vars::b2#0 ← (boolean~) bool_const_vars::$7
+  (boolean~) bool_const_vars::$8 ← ! (boolean) bool_const_vars::b2#0
+  (boolean~) bool_const_vars::$9 ← (boolean) bool_const_vars::b1#0 && (boolean~) bool_const_vars::$8
+  (boolean~) bool_const_vars::$10 ← (boolean~) bool_const_vars::$9 || false
+  (boolean) bool_const_vars::b#0 ← (boolean~) bool_const_vars::$10
+  (boolean~) bool_const_vars::$11 ← ! (boolean) bool_const_vars::b#0
+  if((boolean~) bool_const_vars::$11) goto bool_const_vars::@1
   to:bool_const_vars::@3
 bool_const_vars::@1: scope:[bool_const_vars]  from bool_const_vars
   *((byte*) SCREEN#0 + (byte/signed byte/word/signed word/dword/signed dword) 1) ← (byte) 'f'
@@ -246,8 +278,16 @@ SYMBOL TABLE SSA
 (void()) bool_const_vars()
 (boolean~) bool_const_vars::$0
 (boolean~) bool_const_vars::$1
+(boolean~) bool_const_vars::$10
+(boolean~) bool_const_vars::$11
 (boolean~) bool_const_vars::$2
 (boolean~) bool_const_vars::$3
+(boolean~) bool_const_vars::$4
+(signed byte/signed word/signed dword~) bool_const_vars::$5
+(boolean~) bool_const_vars::$6
+(boolean~) bool_const_vars::$7
+(boolean~) bool_const_vars::$8
+(boolean~) bool_const_vars::$9
 (label) bool_const_vars::@1
 (label) bool_const_vars::@3
 (label) bool_const_vars::@return
@@ -268,21 +308,33 @@ OPTIMIZING CONTROL FLOW GRAPH
 Culled Empty Block (label) main::@2
 Culled Empty Block (label) @4
 Succesful SSA optimization Pass2CullEmptyBlocks
-Alias (boolean) bool_const_vars::b1#0 = (boolean~) bool_const_vars::$0 
-Alias (boolean) bool_const_vars::b2#0 = (boolean~) bool_const_vars::$1 
-Alias (boolean) bool_const_vars::b#0 = (boolean~) bool_const_vars::$2 
+Inversing boolean not (boolean~) bool_const_vars::$2 ← (byte/signed byte/word/signed word/dword/signed dword) 21 >= (byte) bool_const_vars::a#0 from (boolean~) bool_const_vars::$1 ← (byte/signed byte/word/signed word/dword/signed dword) 21 < (byte) bool_const_vars::a#0
+Succesful SSA optimization Pass2UnaryNotSimplification
+Alias (boolean) bool_const_vars::b1#0 = (boolean~) bool_const_vars::$3 
+Alias (boolean) bool_const_vars::b2#0 = (boolean~) bool_const_vars::$7 
+Alias (boolean) bool_const_vars::b#0 = (boolean~) bool_const_vars::$10 
 Succesful SSA optimization Pass2AliasElimination
 Constant (const byte*) SCREEN#0 = ((byte*))1024
 Constant (const boolean) bool_const_if::b#0 = true
 Constant (const byte) bool_const_vars::a#0 = 14
+Constant (const signed byte/signed word/signed dword) bool_const_vars::$5 = -8
 Succesful SSA optimization Pass2ConstantIdentification
 Constant (const boolean) bool_const_if::$0 = !bool_const_if::b#0
-Constant (const boolean) bool_const_vars::b1#0 = bool_const_vars::a#0==15
-Constant (const boolean) bool_const_vars::b2#0 = 21<bool_const_vars::a#0
+Constant (const boolean) bool_const_vars::$0 = bool_const_vars::a#0==15
+Constant (const boolean) bool_const_vars::$2 = 21>=bool_const_vars::a#0
+Constant (const boolean) bool_const_vars::$4 = bool_const_vars::a#0!=44
+Constant (const boolean) bool_const_vars::$6 = bool_const_vars::a#0>=bool_const_vars::$5
 Succesful SSA optimization Pass2ConstantIdentification
-Constant (const boolean) bool_const_vars::b#0 = bool_const_vars::b1#0||bool_const_vars::b2#0
+Constant (const boolean) bool_const_vars::b1#0 = bool_const_vars::$0||bool_const_vars::$2
+Constant (const boolean) bool_const_vars::b2#0 = bool_const_vars::$4||bool_const_vars::$6
 Succesful SSA optimization Pass2ConstantIdentification
-Constant (const boolean) bool_const_vars::$3 = !bool_const_vars::b#0
+Constant (const boolean) bool_const_vars::$8 = !bool_const_vars::b2#0
+Succesful SSA optimization Pass2ConstantIdentification
+Constant (const boolean) bool_const_vars::$9 = bool_const_vars::b1#0&&bool_const_vars::$8
+Succesful SSA optimization Pass2ConstantIdentification
+Constant (const boolean) bool_const_vars::b#0 = bool_const_vars::$9||false
+Succesful SSA optimization Pass2ConstantIdentification
+Constant (const boolean) bool_const_vars::$11 = !bool_const_vars::b#0
 Succesful SSA optimization Pass2ConstantIdentification
 Consolidated array index constant in *(SCREEN#0+0)
 Consolidated array index constant in *(SCREEN#0+0)
@@ -290,21 +342,31 @@ Consolidated array index constant in *(SCREEN#0+1)
 Consolidated array index constant in *(SCREEN#0+1)
 Succesful SSA optimization Pass2ConstantAdditionElimination
 if() condition always false - eliminating if if((const boolean) bool_const_if::$0) goto bool_const_if::@1
-if() condition always true - replacing block destination if((const boolean) bool_const_vars::$3) goto bool_const_vars::@1
+if() condition always true - replacing block destination if((const boolean) bool_const_vars::$11) goto bool_const_vars::@1
 Succesful SSA optimization Pass2ConstantIfs
 Removing unused block bool_const_if::@1
 Removing unused block bool_const_vars::@3
 Succesful SSA optimization Pass2EliminateUnusedBlocks
 Eliminating unused constant (const boolean) bool_const_if::$0
-Eliminating unused constant (const boolean) bool_const_vars::$3
+Eliminating unused constant (const boolean) bool_const_vars::$11
 Succesful SSA optimization PassNEliminateUnusedVars
 Eliminating unused constant (const boolean) bool_const_if::b#0
 Eliminating unused constant (const boolean) bool_const_vars::b#0
 Succesful SSA optimization PassNEliminateUnusedVars
+Eliminating unused constant (const boolean) bool_const_vars::$9
+Succesful SSA optimization PassNEliminateUnusedVars
 Eliminating unused constant (const boolean) bool_const_vars::b1#0
+Eliminating unused constant (const boolean) bool_const_vars::$8
+Succesful SSA optimization PassNEliminateUnusedVars
+Eliminating unused constant (const boolean) bool_const_vars::$0
+Eliminating unused constant (const boolean) bool_const_vars::$2
 Eliminating unused constant (const boolean) bool_const_vars::b2#0
 Succesful SSA optimization PassNEliminateUnusedVars
+Eliminating unused constant (const boolean) bool_const_vars::$4
+Eliminating unused constant (const boolean) bool_const_vars::$6
+Succesful SSA optimization PassNEliminateUnusedVars
 Eliminating unused constant (const byte) bool_const_vars::a#0
+Eliminating unused constant (const signed byte/signed word/signed dword) bool_const_vars::$5
 Succesful SSA optimization PassNEliminateUnusedVars
 OPTIMIZING CONTROL FLOW GRAPH
 Block Sequence Planned @begin @3 @end main main::@1 main::@return bool_const_vars bool_const_vars::@1 bool_const_vars::@return bool_const_if bool_const_if::@3 bool_const_if::@return