diff --git a/src/main/java/dk/camelot64/kickc/asm/AsmProgramStaticRegisterValues.java b/src/main/java/dk/camelot64/kickc/asm/AsmProgramStaticRegisterValues.java
index c00928166..5e87fe9db 100644
--- a/src/main/java/dk/camelot64/kickc/asm/AsmProgramStaticRegisterValues.java
+++ b/src/main/java/dk/camelot64/kickc/asm/AsmProgramStaticRegisterValues.java
@@ -107,6 +107,22 @@ public class AsmProgramStaticRegisterValues {
          if (instructionType.getMnemnonic().equals("sty") && (instructionType.getAddressingMode().equals(AsmAddressingMode.ZP)||instructionType.getAddressingMode().equals(AsmAddressingMode.ABS))) {
             current.setyMem(instruction.getParameter());
          }
+         if (instructionType.getMnemnonic().equals("txa")) {
+            current.setA(current.getX());
+            current.setaMem(current.getxMem());
+         }
+         if (instructionType.getMnemnonic().equals("tax")) {
+            current.setX(current.getA());
+            current.setxMem(current.getaMem());
+         }
+         if (instructionType.getMnemnonic().equals("tya")) {
+            current.setA(current.getY());
+            current.setaMem(current.getyMem());
+         }
+         if (instructionType.getMnemnonic().equals("tay")) {
+            current.setY(current.getA());
+            current.setyMem(current.getaMem());
+         }
          if (instructionType.getMnemnonic().equals("sec")) {
             current.setC(Boolean.TRUE);
          }
diff --git a/src/main/java/dk/camelot64/kickc/passes/Pass5UnnecesaryLoadElimination.java b/src/main/java/dk/camelot64/kickc/passes/Pass5UnnecesaryLoadElimination.java
index 567907b7d..0889ed948 100644
--- a/src/main/java/dk/camelot64/kickc/passes/Pass5UnnecesaryLoadElimination.java
+++ b/src/main/java/dk/camelot64/kickc/passes/Pass5UnnecesaryLoadElimination.java
@@ -36,6 +36,14 @@ public class Pass5UnnecesaryLoadElimination extends Pass5AsmOptimization {
                   AsmProgramStaticRegisterValues.AsmRegisterValues instructionValues = staticValues.getValues(instruction);
                   if (instructionValues.getA() != null && instructionValues.getA().equals(immValue)) {
                      modified = remove(lineIt);
+                  } else if (instructionValues.getX() != null && instructionValues.getX().equals(immValue)) {
+                     getLog().append("Replacing instruction "+instruction+" with TXA");
+                     instruction.setType(AsmInstructionSet.getInstructionType("txa", AsmAddressingMode.NON, null, false));
+                     instruction.setParameter(null);
+                  } else if (instructionValues.getY() != null && instructionValues.getY().equals(immValue)) {
+                     getLog().append("Replacing instruction "+instruction+" with TYA");
+                     instruction.setType(AsmInstructionSet.getInstructionType("tya", AsmAddressingMode.NON, null, false));
+                     instruction.setParameter(null);
                   }
                }
                if (instructionType.getMnemnonic().equals("lda") && (instructionType.getAddressingMode().equals(AsmAddressingMode.ZP)||instructionType.getAddressingMode().equals(AsmAddressingMode.ABS))) {
@@ -58,6 +66,10 @@ public class Pass5UnnecesaryLoadElimination extends Pass5AsmOptimization {
                   AsmProgramStaticRegisterValues.AsmRegisterValues instructionValues = staticValues.getValues(instruction);
                   if (instructionValues.getX() != null && instructionValues.getX().equals(immValue)) {
                      modified = remove(lineIt);
+                  } else if (instructionValues.getA() != null && instructionValues.getA().equals(immValue)) {
+                     getLog().append("Replacing instruction "+instruction+" with TAX");
+                     instruction.setType(AsmInstructionSet.getInstructionType("tax", AsmAddressingMode.NON, null, false));
+                     instruction.setParameter(null);
                   }
                }
                if (instructionType.getMnemnonic().equals("ldx") && (instructionType.getAddressingMode().equals(AsmAddressingMode.ZP)||instructionType.getAddressingMode().equals(AsmAddressingMode.ABS))) {
@@ -76,6 +88,10 @@ public class Pass5UnnecesaryLoadElimination extends Pass5AsmOptimization {
                   AsmProgramStaticRegisterValues.AsmRegisterValues instructionValues = staticValues.getValues(instruction);
                   if (instructionValues.getY() != null && instructionValues.getY().equals(immValue)) {
                      modified = remove(lineIt);
+                  } else if (instructionValues.getA() != null && instructionValues.getA().equals(immValue)) {
+                     getLog().append("Replacing instruction "+instruction+" with TAY");
+                     instruction.setType(AsmInstructionSet.getInstructionType("tay", AsmAddressingMode.NON, null, false));
+                     instruction.setParameter(null);
                   }
                }
                if (instructionType.getMnemnonic().equals("ldy") && (instructionType.getAddressingMode().equals(AsmAddressingMode.ZP)||instructionType.getAddressingMode().equals(AsmAddressingMode.ABS))) {
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.asm b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.asm
index 6a29d5566..65db375f5 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.asm
@@ -395,7 +395,7 @@ init_plot_tables: {
     lda #0
     sta yoffs
     sta yoffs+1
-    ldx #0
+    tax
   b3:
     txa
     and #7
@@ -433,7 +433,7 @@ init_screen: {
     sta b+1
   b1:
     ldy #0
-    lda #0
+    tya
     sta (b),y
     inc b
     bne !+
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.log b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.log
index 9a1535c29..f414f7838 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-bresenham.log
@@ -18346,6 +18346,8 @@ Removing instruction lda yd
 Removing instruction lda yd
 Removing instruction ldy #0
 Removing instruction lda #0
+Replacing instruction ldx #0 with TAX
+Replacing instruction lda #0 with TYA
 Succesful ASM optimization Pass5UnnecesaryLoadElimination
 ASSEMBLER
 //SEG0 Basic Upstart
@@ -19138,7 +19140,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG317 [171] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
     jmp b3
   //SEG318 [171] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   b3_from_b4:
@@ -19217,7 +19219,7 @@ init_screen: {
   b1:
   //SEG348 [187] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG349 [188] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -20080,7 +20082,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG317 [171] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
     jmp b3
   //SEG318 [171] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG319 [171] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
@@ -20154,7 +20156,7 @@ init_screen: {
   b1:
   //SEG348 [187] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG349 [188] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -20978,7 +20980,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG317 [171] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
     jmp b3
   //SEG318 [171] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG319 [171] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
@@ -21049,7 +21051,7 @@ init_screen: {
   b1:
   //SEG348 [187] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG349 [188] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -21825,7 +21827,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG317 [171] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
   //SEG318 [171] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG319 [171] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
   //SEG320 [171] phi (byte) init_plot_tables::y#2 = (byte) init_plot_tables::y#1 [phi:init_plot_tables::@4->init_plot_tables::@3#1] -- register_copy 
@@ -21894,7 +21896,7 @@ init_screen: {
   b1:
   //SEG348 [187] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG349 [188] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -23017,7 +23019,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG317 [171] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
   //SEG318 [171] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG319 [171] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
   //SEG320 [171] phi (byte) init_plot_tables::y#2 = (byte) init_plot_tables::y#1 [phi:init_plot_tables::@4->init_plot_tables::@3#1] -- register_copy 
@@ -23086,7 +23088,7 @@ init_screen: {
   b1:
   //SEG348 [187] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG349 [188] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.asm b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.asm
index bea04b769..806ecc276 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.asm
@@ -122,7 +122,7 @@ init_plot_tables: {
     lda #0
     sta yoffs
     sta yoffs+1
-    ldx #0
+    tax
   b3:
     txa
     and #7
@@ -160,7 +160,7 @@ init_screen: {
     sta b+1
   b1:
     ldy #0
-    lda #0
+    tya
     sta (b),y
     inc b
     bne !+
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.log b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.log
index 393275f6c..f843e70d3 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/bitmap-plotter.log
@@ -6913,6 +6913,8 @@ init_screen: {
 Removing instruction lda #0
 Removing instruction ldy #0
 Removing instruction lda #0
+Replacing instruction ldx #0 with TAX
+Replacing instruction lda #0 with TYA
 Succesful ASM optimization Pass5UnnecesaryLoadElimination
 ASSEMBLER
 //SEG0 Basic Upstart
@@ -7141,7 +7143,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG79 [47] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
     jmp b3
   //SEG80 [47] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   b3_from_b4:
@@ -7220,7 +7222,7 @@ init_screen: {
   b1:
   //SEG110 [63] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG111 [64] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -7511,7 +7513,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG79 [47] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
     jmp b3
   //SEG80 [47] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG81 [47] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
@@ -7585,7 +7587,7 @@ init_screen: {
   b1:
   //SEG110 [63] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG111 [64] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -7862,7 +7864,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG79 [47] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
     jmp b3
   //SEG80 [47] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG81 [47] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
@@ -7933,7 +7935,7 @@ init_screen: {
   b1:
   //SEG110 [63] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG111 [64] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -8191,7 +8193,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG79 [47] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
   //SEG80 [47] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG81 [47] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
   //SEG82 [47] phi (byte) init_plot_tables::y#2 = (byte) init_plot_tables::y#1 [phi:init_plot_tables::@4->init_plot_tables::@3#1] -- register_copy 
@@ -8260,7 +8262,7 @@ init_screen: {
   b1:
   //SEG110 [63] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG111 [64] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
@@ -8659,7 +8661,7 @@ init_plot_tables: {
     sta yoffs
     sta yoffs+1
   //SEG79 [47] phi (byte) init_plot_tables::y#2 = (byte) 0 [phi:init_plot_tables::@2->init_plot_tables::@3#1] -- xby=coby1 
-    ldx #0
+    tax
   //SEG80 [47] phi from init_plot_tables::@4 to init_plot_tables::@3 [phi:init_plot_tables::@4->init_plot_tables::@3]
   //SEG81 [47] phi (byte*) init_plot_tables::yoffs#2 = (byte*) init_plot_tables::yoffs#4 [phi:init_plot_tables::@4->init_plot_tables::@3#0] -- register_copy 
   //SEG82 [47] phi (byte) init_plot_tables::y#2 = (byte) init_plot_tables::y#1 [phi:init_plot_tables::@4->init_plot_tables::@3#1] -- register_copy 
@@ -8728,7 +8730,7 @@ init_screen: {
   b1:
   //SEG110 [63] *((byte*) init_screen::b#2) ← (byte) 0 [ init_screen::b#2 ] ( main:0::init_screen:5 [ init_screen::b#2 ] ) -- _deref_zpptrby1=coby1 
     ldy #0
-    lda #0
+    tya
     sta (b),y
   //SEG111 [64] (byte*) init_screen::b#1 ← ++ (byte*) init_screen::b#2 [ init_screen::b#1 ] ( main:0::init_screen:5 [ init_screen::b#1 ] ) -- zpptrby1=_inc_zpptrby1 
     inc b
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.asm b/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.asm
index 2034c803d..a10d8ff30 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.asm
@@ -14,10 +14,10 @@ main: {
     lda #0
     sta y
     ldy #yd/2
-    ldx #0
+    tax
     lda #0+0*$28
     sta idx
-    lda #0
+    txa
     sta idx+1
   b1:
     lda #<screen
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.log b/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.log
index 141669553..748cf668e 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/bresenhamarr.log
@@ -1764,6 +1764,8 @@ main: {
     rts
 }
 
+Replacing instruction ldx #0 with TAX
+Replacing instruction lda #0 with TXA
 Replacing label b2_from_b1 with b2
 Replacing label b1_from_b2 with b1
 Removing instruction bbegin:
@@ -1804,11 +1806,11 @@ main: {
   //SEG10 [2] phi (byte) main::e#3 = (const byte) main::yd#0/(byte) 2 [phi:main->main::@1#1] -- yby=coby1 
     ldy #yd/2
   //SEG11 [2] phi (byte) main::x#2 = (byte) 0 [phi:main->main::@1#2] -- xby=coby1 
-    ldx #0
+    tax
   //SEG12 [2] phi (word) main::idx#3 = (byte) 0+(byte) 0*(byte) 40 [phi:main->main::@1#3] -- zpwo1=coby1 
     lda #0+0*$28
     sta idx
-    lda #0
+    txa
     sta idx+1
     jmp b1
   //SEG13 [2] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
@@ -1911,11 +1913,11 @@ main: {
   //SEG10 [2] phi (byte) main::e#3 = (const byte) main::yd#0/(byte) 2 [phi:main->main::@1#1] -- yby=coby1 
     ldy #yd/2
   //SEG11 [2] phi (byte) main::x#2 = (byte) 0 [phi:main->main::@1#2] -- xby=coby1 
-    ldx #0
+    tax
   //SEG12 [2] phi (word) main::idx#3 = (byte) 0+(byte) 0*(byte) 40 [phi:main->main::@1#3] -- zpwo1=coby1 
     lda #0+0*$28
     sta idx
-    lda #0
+    txa
     sta idx+1
     jmp b1
   //SEG13 [2] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
@@ -2012,11 +2014,11 @@ main: {
   //SEG10 [2] phi (byte) main::e#3 = (const byte) main::yd#0/(byte) 2 [phi:main->main::@1#1] -- yby=coby1 
     ldy #yd/2
   //SEG11 [2] phi (byte) main::x#2 = (byte) 0 [phi:main->main::@1#2] -- xby=coby1 
-    ldx #0
+    tax
   //SEG12 [2] phi (word) main::idx#3 = (byte) 0+(byte) 0*(byte) 40 [phi:main->main::@1#3] -- zpwo1=coby1 
     lda #0+0*$28
     sta idx
-    lda #0
+    txa
     sta idx+1
   //SEG13 [2] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
   //SEG14 [2] phi (byte) main::y#2 = (byte) main::y#4 [phi:main::@2->main::@1#0] -- register_copy 
@@ -2156,11 +2158,11 @@ main: {
   //SEG10 [2] phi (byte) main::e#3 = (const byte) main::yd#0/(byte) 2 [phi:main->main::@1#1] -- yby=coby1 
     ldy #yd/2
   //SEG11 [2] phi (byte) main::x#2 = (byte) 0 [phi:main->main::@1#2] -- xby=coby1 
-    ldx #0
+    tax
   //SEG12 [2] phi (word) main::idx#3 = (byte) 0+(byte) 0*(byte) 40 [phi:main->main::@1#3] -- zpwo1=coby1 
     lda #0+0*$28
     sta idx
-    lda #0
+    txa
     sta idx+1
   //SEG13 [2] phi from main::@2 to main::@1 [phi:main::@2->main::@1]
   //SEG14 [2] phi (byte) main::y#2 = (byte) main::y#4 [phi:main::@2->main::@1#0] -- register_copy 
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/modglobal.asm b/src/main/java/dk/camelot64/kickc/test/ref/modglobal.asm
index 5c17fe197..d9ce07037 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/modglobal.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/modglobal.asm
@@ -7,8 +7,8 @@
 main: {
     lda #0
     sta cnt3
-    ldy #0
-    ldx #0
+    tay
+    tax
     jsr inccnt
     sta SCREEN+0
     inx
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/modglobal.log b/src/main/java/dk/camelot64/kickc/test/ref/modglobal.log
index 56722e745..15bd4b075 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/modglobal.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/modglobal.log
@@ -1150,6 +1150,8 @@ inccnt: {
     rts
 }
 
+Replacing instruction ldy #0 with TAY
+Replacing instruction ldx #0 with TAX
 Removing instruction bbegin:
 Removing instruction main_from_b2:
 Succesful ASM optimization Pass5RedundantLabelElimination
@@ -1178,9 +1180,9 @@ main: {
     lda #0
     sta cnt3
   //SEG11 [10] phi (byte) cnt2#10 = (byte) 0 [phi:main->inccnt#1] -- yby=coby1 
-    ldy #0
+    tay
   //SEG12 [10] phi (byte) cnt#11 = (byte) 0 [phi:main->inccnt#2] -- xby=coby1 
-    ldx #0
+    tax
     jsr inccnt
   //SEG13 main::@1
   b1:
@@ -1255,9 +1257,9 @@ main: {
     lda #0
     sta cnt3
   //SEG11 [10] phi (byte) cnt2#10 = (byte) 0 [phi:main->inccnt#1] -- yby=coby1 
-    ldy #0
+    tay
   //SEG12 [10] phi (byte) cnt#11 = (byte) 0 [phi:main->inccnt#2] -- xby=coby1 
-    ldx #0
+    tax
     jsr inccnt
   //SEG13 main::@1
   //SEG14 [3] (byte~) main::$0 ← (byte) inccnt::return#0 [ main::$0 cnt#1 cnt2#1 cnt3#1 ] ( main:0 [ main::$0 cnt#1 cnt2#1 cnt3#1 ] )
@@ -1353,9 +1355,9 @@ main: {
     lda #0
     sta cnt3
   //SEG11 [10] phi (byte) cnt2#10 = (byte) 0 [phi:main->inccnt#1] -- yby=coby1 
-    ldy #0
+    tay
   //SEG12 [10] phi (byte) cnt#11 = (byte) 0 [phi:main->inccnt#2] -- xby=coby1 
-    ldx #0
+    tax
     jsr inccnt
   //SEG13 main::@1
   //SEG14 [3] (byte~) main::$0 ← (byte) inccnt::return#0 [ main::$0 cnt#1 cnt2#1 cnt3#1 ] ( main:0 [ main::$0 cnt#1 cnt2#1 cnt3#1 ] )
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.asm b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.asm
index 036d88c9e..08cd2eb27 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.asm
+++ b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.asm
@@ -73,7 +73,7 @@ lvalue: {
     sta SCREEN
     lda #2
     sta SCREEN+1
-    ldx #2
+    tax
   b1:
     cpx #$a
     bcc b2
diff --git a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.log b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.log
index 191a76d76..d4204c4af 100644
--- a/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.log
+++ b/src/main/java/dk/camelot64/kickc/test/ref/ptrtest.log
@@ -3054,6 +3054,7 @@ lvalue: {
     jmp b1
 }
 
+Replacing instruction ldx #2 with TAX
 FINAL SYMBOL TABLE
 (label) @5
 (label) @begin
@@ -3264,7 +3265,7 @@ lvalue: {
     sta SCREEN+1
   //SEG66 [30] phi from lvalue to lvalue::@1 [phi:lvalue->lvalue::@1]
   //SEG67 [30] phi (byte) lvalue::i#2 = (byte) 2 [phi:lvalue->lvalue::@1#0] -- xby=coby1 
-    ldx #2
+    tax
   //SEG68 lvalue::@1
   b1:
   //SEG69 [31] if((byte) lvalue::i#2<(byte) 10) goto lvalue::@2 [ lvalue::i#2 ] ( main:0::lvalue:2 [ lvalue::i#2 ] ) -- xby_lt_coby1_then_la1