diff --git a/lang/src/son.rs b/lang/src/son.rs
index b5fcd999..33cbf7c9 100644
--- a/lang/src/son.rs
+++ b/lang/src/son.rs
@@ -1765,6 +1765,11 @@ impl Nodes {
             (*target, self[*target].outputs.as_slice())
         }
     }
+
+    fn is_hard_zero(&self, nid: Nid) -> bool {
+        self[nid].kind == Kind::CInt { value: 0 }
+            && self[nid].outputs.iter().all(|&n| self[n].kind != Kind::Phi)
+    }
 }
 
 enum CondOptRes {
@@ -2943,7 +2948,6 @@ impl<'a> Codegen<'a> {
                         self.strip_var(&mut rhs);
                         self.implicit_unwrap(right.pos(), &mut rhs);
                         let (ty, aclass) = self.binop_ty(pos, &mut lhs, &mut rhs, op);
-                        let fty = ty.bin_ret(op);
                         if matches!(
                             op,
                             TokenKind::Lt
@@ -2967,9 +2971,12 @@ impl<'a> Codegen<'a> {
                                 }
                             }
                         }
-                        let inps = [VOID, lhs.id, rhs.id];
-                        let bop =
-                            self.ci.nodes.new_node_lit(fty, Kind::BinOp { op }, inps, self.tys);
+                        let bop = self.ci.nodes.new_node_lit(
+                            ty.bin_ret(op),
+                            Kind::BinOp { op },
+                            [VOID, lhs.id, rhs.id],
+                            self.tys,
+                        );
                         self.ci.nodes.pass_aclass(aclass, bop.id);
                         Some(bop)
                     }
diff --git a/lang/src/son/hbvm.rs b/lang/src/son/hbvm.rs
index 24c594a0..8f1a243a 100644
--- a/lang/src/son/hbvm.rs
+++ b/lang/src/son/hbvm.rs
@@ -398,7 +398,8 @@ impl Nodes {
     fn is_never_used(&self, nid: Nid, tys: &Types) -> bool {
         let node = &self[nid];
         match node.kind {
-            Kind::CInt { .. } => node.outputs.iter().all(|&o| {
+            Kind::CInt { value: 0 } => false,
+            Kind::CInt { value: 1.. } => node.outputs.iter().all(|&o| {
                 matches!(self[o].kind, Kind::BinOp { op }
                         if op.imm_binop(self[o].ty).is_some()
                             && self.is_const(self[o].inputs[2])
diff --git a/lang/src/son/hbvm/their_regalloc.rs b/lang/src/son/hbvm/their_regalloc.rs
index a4e36f03..a1e6b4ae 100644
--- a/lang/src/son/hbvm/their_regalloc.rs
+++ b/lang/src/son/hbvm/their_regalloc.rs
@@ -223,6 +223,7 @@ impl HbvmBackend {
                     Kind::Die => {
                         self.emit(instrs::un());
                     }
+                    Kind::CInt { value: 0 } => self.emit(instrs::cp(atr(allocs[0]), reg::ZERO)),
                     Kind::CInt { value } if node.ty.is_float() => {
                         self.emit(match node.ty {
                             ty::Id::F32 => instrs::li32(
@@ -563,7 +564,11 @@ impl<'a> Function<'a> {
             }
         );
         debug_assert!(self.nodes[nid].kind != Kind::Phi || self.nodes[nid].ty != ty::Id::VOID);
-        regalloc2::VReg::new(nid as _, regalloc2::RegClass::Int)
+        if self.nodes.is_hard_zero(nid) {
+            regalloc2::VReg::new(NEVER as _, regalloc2::RegClass::Int)
+        } else {
+            regalloc2::VReg::new(nid as _, regalloc2::RegClass::Int)
+        }
     }
 
     fn emit_node(&mut self, nid: Nid, prev: Nid) {
@@ -680,6 +685,7 @@ impl<'a> Function<'a> {
                 self.add_instr(nid, vec![]);
                 self.emit_node(node.outputs[0], nid);
             }
+            Kind::CInt { value: 0 } if self.nodes.is_hard_zero(nid) => {}
             Kind::CInt { .. } => {
                 let ops = vec![self.drg(nid)];
                 self.add_instr(nid, ops);
@@ -687,6 +693,11 @@ impl<'a> Function<'a> {
             Kind::Entry => {
                 self.backrefs[nid as usize] = self.add_block(nid);
 
+                self.add_instr(NEVER, vec![regalloc2::Operand::reg_fixed_def(
+                    regalloc2::VReg::new(NEVER as _, regalloc2::RegClass::Int),
+                    regalloc2::PReg::new(0, regalloc2::RegClass::Int),
+                )]);
+
                 let (ret, mut parama) = self.tys.parama(self.sig.ret);
                 let mut typs = self.sig.args.args();
                 #[expect(clippy::unnecessary_to_owned)]
diff --git a/lang/tests/son_tests_advanced_floating_point_arithmetic.txt b/lang/tests/son_tests_advanced_floating_point_arithmetic.txt
index 6f570166..28338097 100644
--- a/lang/tests/son_tests_advanced_floating_point_arithmetic.txt
+++ b/lang/tests/son_tests_advanced_floating_point_arithmetic.txt
@@ -10,34 +10,34 @@ main:
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 sin:
-    LI32 r4, 1124073472w
-    LI32 r5, 1078530011w
-    FMUL32 r7, r2, r4
-    FDIV32 r9, r7, r5
-    FTI32 r11, r9, 1b
-    ANDI r10, r11, 255d
-    ITF64 r5, r11
-    MULI64 r4, r10, 4d
-    LRA r3, r0, :SIN_TABLE
-    LI32 r7, 1086918619w
-    FC64T32 r9, r5, 1b
-    ADDI64 r5, r11, 64d
-    ADD64 r8, r3, r4
-    LI32 r1, 1132462080w
-    FMUL32 r6, r9, r7
-    ANDI r7, r5, 255d
-    LI32 r5, 1056964608w
-    LD r4, r8, 0a, 4h
-    FDIV32 r8, r6, r1
-    MULI64 r6, r7, 4d
-    FMUL32 r10, r4, r5
-    FSUB32 r11, r2, r8
-    ADD64 r9, r3, r6
-    FMUL32 r2, r11, r10
-    LD r12, r9, 0a, 4h
-    FSUB32 r5, r12, r2
-    FMUL32 r7, r5, r11
-    FADD32 r1, r4, r7
+    LI32 r6, 1124073472w
+    LI32 r7, 1078530011w
+    FMUL32 r9, r2, r6
+    FDIV32 r11, r9, r7
+    FTI32 r1, r11, 1b
+    ANDI r12, r1, 255d
+    ITF64 r6, r1
+    MULI64 r5, r12, 4d
+    LRA r4, r0, :SIN_TABLE
+    LI32 r9, 1086918619w
+    FC64T32 r11, r6, 1b
+    ADDI64 r6, r1, 64d
+    ADD64 r10, r4, r5
+    LI32 r3, 1132462080w
+    FMUL32 r8, r11, r9
+    ANDI r9, r6, 255d
+    LI32 r7, 1056964608w
+    LD r5, r10, 0a, 4h
+    FDIV32 r10, r8, r3
+    MULI64 r8, r9, 4d
+    FMUL32 r12, r5, r7
+    FSUB32 r1, r2, r10
+    ADD64 r11, r4, r8
+    FMUL32 r4, r1, r12
+    LD r2, r11, 0a, 4h
+    FSUB32 r7, r2, r4
+    FMUL32 r9, r7, r1
+    FADD32 r1, r5, r9
     JALA r0, r31, 0a
 code size: 1303
 ret: 826
diff --git a/lang/tests/son_tests_aliasing_overoptimization.txt b/lang/tests/son_tests_aliasing_overoptimization.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_aliasing_overoptimization.txt
+++ b/lang/tests/son_tests_aliasing_overoptimization.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_arithmetic.txt b/lang/tests/son_tests_arithmetic.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_arithmetic.txt
+++ b/lang/tests/son_tests_arithmetic.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_arrays.txt b/lang/tests/son_tests_arrays.txt
index b8c50e38..21929dbb 100644
--- a/lang/tests/son_tests_arrays.txt
+++ b/lang/tests/son_tests_arrays.txt
@@ -14,13 +14,13 @@ main:
     ADDI64 r254, r254, 56d
     JALA r0, r31, 0a
 pass:
-    LD r4, r2, 8a, 8h
-    MULI64 r7, r4, 8d
-    LD r5, r2, 0a, 8h
-    ADD64 r10, r7, r2
-    ADD64 r9, r4, r5
-    LD r1, r10, 0a, 8h
-    ADD64 r1, r1, r9
+    LD r6, r2, 8a, 8h
+    MULI64 r9, r6, 8d
+    LD r7, r2, 0a, 8h
+    ADD64 r12, r9, r2
+    ADD64 r11, r6, r7
+    LD r3, r12, 0a, 8h
+    ADD64 r1, r3, r11
     JALA r0, r31, 0a
 code size: 231
 ret: 8
diff --git a/lang/tests/son_tests_big_array_crash.txt b/lang/tests/son_tests_big_array_crash.txt
index 23c0121e..053fa9ee 100644
--- a/lang/tests/son_tests_big_array_crash.txt
+++ b/lang/tests/son_tests_big_array_crash.txt
@@ -1,6 +1,6 @@
 main:
-    LRA r1, r0, :SIN_TABLE
-    LD r1, r1, 80a, 8h
+    LRA r3, r0, :SIN_TABLE
+    LD r1, r3, 80a, 8h
     JALA r0, r31, 0a
 code size: 767
 ret: 1736
diff --git a/lang/tests/son_tests_branch_assignments.txt b/lang/tests/son_tests_branch_assignments.txt
index bec0bad0..ae2d2177 100644
--- a/lang/tests/son_tests_branch_assignments.txt
+++ b/lang/tests/son_tests_branch_assignments.txt
@@ -2,12 +2,11 @@ main:
     LI64 r1, 1d
     JNE r2, r1, :0
     JMP :1
- 0: LI64 r7, 0d
-    JNE r2, r7, :2
+ 0: JNE r2, r0, :2
     LI64 r1, 2d
     JMP :1
  2: LI64 r1, 3d
  1: JALA r0, r31, 0a
-code size: 79
+code size: 69
 ret: 2
 status: Ok(())
diff --git a/lang/tests/son_tests_c_strings.txt b/lang/tests/son_tests_c_strings.txt
index be908d8c..62042e7e 100644
--- a/lang/tests/son_tests_c_strings.txt
+++ b/lang/tests/son_tests_c_strings.txt
@@ -11,16 +11,16 @@ main:
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 str_len:
-    LI64 r3, 0d
-    CP r1, r3
- 2: LD r7, r2, 0a, 1h
-    ANDI r9, r7, 255d
-    JNE r9, r3, :0
+    CP r5, r0
+    CP r1, r5
+ 2: LD r9, r2, 0a, 1h
+    ANDI r11, r9, 255d
+    JNE r11, r5, :0
     JMP :1
  0: ADDI64 r2, r2, 1d
     ADDI64 r1, r1, 1d
     JMP :2
  1: JALA r0, r31, 0a
-code size: 205
+code size: 198
 ret: 16
 status: Ok(())
diff --git a/lang/tests/son_tests_comments.txt b/lang/tests/son_tests_comments.txt
index 22a5c604..5ae53459 100644
--- a/lang/tests/son_tests_comments.txt
+++ b/lang/tests/son_tests_comments.txt
@@ -4,10 +4,10 @@ main:
     ADDI64 r254, r254, -8d
     ST r31, r254, 0a, 8h
     JAL r31, r0, :foo
-    LI64 r1, 0d
+    CP r1, r0
     LD r31, r254, 0a, 8h
     ADDI64 r254, r254, 8d
     JALA r0, r31, 0a
-code size: 95
+code size: 88
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_comptime_function_from_another_file.txt b/lang/tests/son_tests_comptime_function_from_another_file.txt
index a9b8fb97..3a94ad03 100644
--- a/lang/tests/son_tests_comptime_function_from_another_file.txt
+++ b/lang/tests/son_tests_comptime_function_from_another_file.txt
@@ -1,6 +1,6 @@
 main:
-    LRA r1, r0, :a
-    LD r1, r1, 0a, 8h
+    LRA r3, r0, :a
+    LD r1, r3, 0a, 8h
     JALA r0, r31, 0a
 code size: 47
 ret: 50
diff --git a/lang/tests/son_tests_comptime_min_reg_leak.txt b/lang/tests/son_tests_comptime_min_reg_leak.txt
index a9b8fb97..3a94ad03 100644
--- a/lang/tests/son_tests_comptime_min_reg_leak.txt
+++ b/lang/tests/son_tests_comptime_min_reg_leak.txt
@@ -1,6 +1,6 @@
 main:
-    LRA r1, r0, :a
-    LD r1, r1, 0a, 8h
+    LRA r3, r0, :a
+    LD r1, r3, 0a, 8h
     JALA r0, r31, 0a
 code size: 47
 ret: 50
diff --git a/lang/tests/son_tests_conditional_stores.txt b/lang/tests/son_tests_conditional_stores.txt
index a9a24948..56f890a5 100644
--- a/lang/tests/son_tests_conditional_stores.txt
+++ b/lang/tests/son_tests_conditional_stores.txt
@@ -1,11 +1,11 @@
 cond:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
 main:
     ADDI64 r254, r254, -24d
     ST r31, r254, 0a, 24h
     JAL r31, r0, :cond
-    LI64 r32, 0d
+    CP r32, r0
     CP r33, r32
     JNE r1, r33, :0
     CP r32, r33
@@ -15,6 +15,6 @@ main:
  1: LD r31, r254, 0a, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
-code size: 134
+code size: 120
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_const_folding_with_arg.txt b/lang/tests/son_tests_const_folding_with_arg.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_const_folding_with_arg.txt
+++ b/lang/tests/son_tests_const_folding_with_arg.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_dead_code_in_loop.txt b/lang/tests/son_tests_dead_code_in_loop.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_dead_code_in_loop.txt
+++ b/lang/tests/son_tests_dead_code_in_loop.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_different_types.txt b/lang/tests/son_tests_different_types.txt
index bad3ba80..e041f085 100644
--- a/lang/tests/son_tests_different_types.txt
+++ b/lang/tests/son_tests_different_types.txt
@@ -1,29 +1,28 @@
 main:
     ADDI64 r254, r254, -12d
-    LI64 r1, 0d
-    LI8 r2, 255b
-    ST r2, r254, 0a, 1h
-    LI8 r5, 0b
-    ST r5, r254, 1a, 1h
-    ST r5, r254, 2a, 1h
-    ST r2, r254, 3a, 1h
-    LI32 r10, 0w
-    ST r10, r254, 4a, 4h
-    LD r8, r254, 4a, 4h
-    LI32 r2, 2w
-    ST r2, r254, 8a, 4h
-    LD r5, r254, 8a, 4h
-    LI64 r9, 2d
-    ANDI r10, r5, 4294967295d
-    JEQ r10, r9, :0
+    LI8 r3, 255b
+    ST r3, r254, 0a, 1h
+    ST r0, r254, 1a, 1h
+    ST r0, r254, 2a, 1h
+    ST r3, r254, 3a, 1h
+    ST r0, r254, 4a, 4h
+    LD r4, r254, 4a, 4h
+    LI32 r11, 2w
+    ST r11, r254, 8a, 4h
+    LD r2, r254, 8a, 4h
+    LI64 r5, 2d
+    ANDI r6, r2, 4294967295d
+    JEQ r6, r5, :0
+    CP r1, r0
     JMP :1
- 0: ANDI r2, r8, 4294967295d
-    JEQ r2, r1, :2
+ 0: CP r1, r0
+    ANDI r10, r4, 4294967295d
+    JEQ r10, r1, :2
     LI64 r1, 64d
     JMP :1
  2: LI64 r1, 512d
  1: ADDI64 r254, r254, 12d
     JALA r0, r31, 0a
-code size: 245
+code size: 232
 ret: 512
 status: Ok(())
diff --git a/lang/tests/son_tests_directives.txt b/lang/tests/son_tests_directives.txt
index 9c25941b..5f826822 100644
--- a/lang/tests/son_tests_directives.txt
+++ b/lang/tests/son_tests_directives.txt
@@ -1,20 +1,20 @@
 main:
     ADDI64 r254, r254, -16d
-    LI64 r1, 10d
+    LI64 r3, 10d
     ADDI64 r4, r254, 0d
-    ST r1, r254, 0a, 8h
-    LI64 r7, 20d
-    ST r7, r254, 8a, 8h
+    ST r3, r254, 0a, 8h
+    LI64 r9, 20d
+    ST r9, r254, 8a, 8h
     LI64 r6, 6d
     LI64 r5, 5d
     LI64 r2, 1d
     CP r3, r4
     LD r3, r3, 0a, 16h
     ECA 
-    LI64 r1, 0d
+    CP r1, r0
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 ev: Ecall
-code size: 155
+code size: 148
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_exhaustive_loop_testing.txt b/lang/tests/son_tests_exhaustive_loop_testing.txt
index eaf456da..483ea0fe 100644
--- a/lang/tests/son_tests_exhaustive_loop_testing.txt
+++ b/lang/tests/son_tests_exhaustive_loop_testing.txt
@@ -1,16 +1,16 @@
 continue_and_state_change:
-    LI64 r7, 3d
-    LI64 r8, 4d
-    LI64 r9, 2d
-    LI64 r10, 10d
- 6: JLTU r2, r10, :0
+    LI64 r9, 3d
+    LI64 r10, 4d
+    LI64 r11, 2d
+    LI64 r12, 10d
+ 6: JLTU r2, r12, :0
     CP r1, r2
     JMP :1
- 0: JNE r2, r9, :2
-    CP r2, r8
+ 0: JNE r2, r11, :2
+    CP r2, r10
     JMP :3
- 2: JNE r2, r7, :4
-    LI64 r1, 0d
+ 2: JNE r2, r9, :4
+    CP r1, r0
  1: JMP :5
  4: ADDI64 r2, r2, 1d
  3: JMP :6
@@ -19,7 +19,7 @@ infinite_loop:
     ADDI64 r254, r254, -24d
     ST r31, r254, 0a, 24h
     LI64 r32, 1d
-    LI64 r33, 0d
+    CP r33, r0
     CP r1, r33
  1: JNE r1, r32, :0
     JMP :0
@@ -30,76 +30,74 @@ infinite_loop:
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -64d
-    ST r31, r254, 0a, 64h
-    LI64 r32, 0d
-    CP r2, r32
+    ADDI64 r254, r254, -48d
+    ST r31, r254, 0a, 48h
+    CP r2, r0
     JAL r31, r0, :multiple_breaks
-    CP r33, r1
+    CP r32, r1
     LI64 r1, 3d
-    JEQ r33, r1, :0
+    JEQ r32, r1, :0
     LI64 r1, 1d
     JMP :1
- 0: CP r34, r1
-    LI64 r35, 4d
-    CP r2, r35
+ 0: CP r33, r1
+    LI64 r34, 4d
+    CP r2, r34
     JAL r31, r0, :multiple_breaks
-    CP r36, r35
-    LI64 r37, 10d
-    JEQ r1, r37, :2
+    CP r35, r34
+    LI64 r36, 10d
+    JEQ r1, r36, :2
     LI64 r1, 2d
     JMP :1
- 2: CP r2, r32
+ 2: CP r2, r0
     JAL r31, r0, :state_change_in_break
-    JEQ r1, r32, :3
-    CP r1, r34
+    JEQ r1, r0, :3
+    CP r1, r33
     JMP :1
- 3: CP r2, r36
+ 3: CP r2, r35
     JAL r31, r0, :state_change_in_break
-    JEQ r1, r37, :4
-    CP r1, r36
+    JEQ r1, r36, :4
+    CP r1, r35
     JMP :1
- 4: CP r2, r37
+ 4: CP r2, r36
     JAL r31, r0, :continue_and_state_change
-    JEQ r1, r37, :5
+    JEQ r1, r36, :5
     LI64 r1, 5d
     JMP :1
- 5: CP r2, r34
+ 5: CP r2, r33
     JAL r31, r0, :continue_and_state_change
-    JEQ r1, r32, :6
+    JEQ r1, r0, :6
     LI64 r1, 6d
     JMP :1
- 6: CP r38, r32
-    JAL r31, r0, :infinite_loop
-    CP r1, r38
- 1: LD r31, r254, 0a, 64h
-    ADDI64 r254, r254, 64d
+ 6: JAL r31, r0, :infinite_loop
+    CP r1, r0
+ 1: LD r31, r254, 0a, 48h
+    ADDI64 r254, r254, 48d
     JALA r0, r31, 0a
 multiple_breaks:
-    LI64 r6, 3d
-    LI64 r5, 10d
- 4: JLTU r2, r5, :0
+    LI64 r8, 3d
+    LI64 r7, 10d
+ 4: JLTU r2, r7, :0
     CP r1, r2
     JMP :1
  0: ADDI64 r1, r2, 1d
-    JNE r1, r6, :2
+    JNE r1, r8, :2
  1: JMP :3
  2: CP r2, r1
     JMP :4
  3: JALA r0, r31, 0a
 state_change_in_break:
-    LI64 r5, 3d
-    LI64 r6, 10d
- 4: JLTU r2, r6, :0
+    LI64 r7, 3d
+    LI64 r8, 10d
+ 4: JLTU r2, r8, :0
     CP r1, r2
     JMP :1
- 0: JNE r2, r5, :2
-    LI64 r1, 0d
+ 0: JNE r2, r7, :2
+    CP r1, r0
  1: JMP :3
  2: ADDI64 r2, r2, 1d
     JMP :4
  3: JALA r0, r31, 0a
 timed out
-code size: 668
+code size: 634
 ret: 10
 status: Ok(())
diff --git a/lang/tests/son_tests_fb_driver.txt b/lang/tests/son_tests_fb_driver.txt
index ae33add2..d5dd4489 100644
--- a/lang/tests/son_tests_fb_driver.txt
+++ b/lang/tests/son_tests_fb_driver.txt
@@ -9,7 +9,7 @@ main:
     ADDI64 r254, r254, -64d
     ST r31, r254, 0a, 64h
     JAL r31, r0, :check_platform
-    LI64 r32, 0d
+    CP r32, r0
     LI64 r33, 30d
     LI64 r34, 100d
     CP r35, r32
@@ -42,12 +42,12 @@ main:
     ADDI64 r254, r254, 64d
     JALA r0, r31, 0a
 set_pixel:
-    MUL64 r7, r3, r4
-    ADD64 r1, r7, r2
+    MUL64 r9, r3, r4
+    ADD64 r1, r9, r2
     JALA r0, r31, 0a
 x86_fb_ptr:
     LI64 r1, 100d
     JALA r0, r31, 0a
-code size: 330
+code size: 323
 ret: 3000
 status: Ok(())
diff --git a/lang/tests/son_tests_generic_type_mishap.txt b/lang/tests/son_tests_generic_type_mishap.txt
index ab5bb18c..dce806e6 100644
--- a/lang/tests/son_tests_generic_type_mishap.txt
+++ b/lang/tests/son_tests_generic_type_mishap.txt
@@ -8,28 +8,26 @@ main:
 opaque:
     JALA r0, r31, 0a
 process:
-    ADDI64 r254, r254, -64d
-    ST r31, r254, 16a, 48h
-    LI64 r32, 0d
-    LI64 r33, 1000d
-    ADDI64 r34, r254, 0d
-    LI8 r35, 0b
-    ST r35, r254, 0a, 1h
- 4: JGTU r33, r32, :0
+    ADDI64 r254, r254, -48d
+    ST r31, r254, 16a, 32h
+    LI64 r32, 1000d
+    ADDI64 r33, r254, 0d
+    ST r0, r254, 0a, 1h
+ 4: JGTU r32, r0, :0
     JMP :1
- 0: CP r2, r34
+ 0: CP r2, r33
     JAL r31, r0, :opaque
-    LD r36, r254, 0a, 1h
-    ANDI r36, r36, 255d
-    ANDI r35, r35, 255d
-    JEQ r36, r35, :2
+    LD r34, r254, 0a, 1h
+    ANDI r34, r34, 255d
+    ANDI r0, r0, 255d
+    JEQ r34, r0, :2
     JMP :3
- 2: ADDI64 r33, r33, -1d
+ 2: ADDI64 r32, r32, -1d
  1: JMP :4
- 3: LD r31, r254, 16a, 48h
-    ADDI64 r254, r254, 64d
+ 3: LD r31, r254, 16a, 32h
+    ADDI64 r254, r254, 48d
     JALA r0, r31, 0a
 timed out
-code size: 272
+code size: 259
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_generic_types.txt b/lang/tests/son_tests_generic_types.txt
index 2fa320d9..f84a5c03 100644
--- a/lang/tests/son_tests_generic_types.txt
+++ b/lang/tests/son_tests_generic_types.txt
@@ -14,12 +14,12 @@ deinit:
     ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
 free:
-    CP r10, r2
-    LRA r7, r0, :FREE_SYS_CALL
-    LD r2, r7, 0a, 8h
+    CP r11, r2
+    LRA r9, r0, :FREE_SYS_CALL
+    LD r2, r9, 0a, 8h
     CP r5, r4
     CP r4, r3
-    CP r3, r10
+    CP r3, r11
     ECA 
     JALA r0, r31, 0a
 main:
@@ -40,86 +40,83 @@ main:
     ADDI64 r254, r254, 56d
     JALA r0, r31, 0a
 malloc:
-    CP r9, r2
-    LRA r5, r0, :MALLOC_SYS_CALL
-    LD r2, r5, 0a, 8h
+    CP r10, r2
+    LRA r7, r0, :MALLOC_SYS_CALL
+    LD r2, r7, 0a, 8h
     CP r4, r3
-    CP r3, r9
+    CP r3, r10
     ECA 
     JALA r0, r31, 0a
 new:
     ADDI64 r254, r254, -24d
-    LI64 r4, 0d
     ADDI64 r5, r254, 0d
-    ST r4, r254, 0a, 8h
-    ST r4, r254, 8a, 8h
-    ST r4, r254, 16a, 8h
+    ST r0, r254, 0a, 8h
+    ST r0, r254, 8a, 8h
+    ST r0, r254, 16a, 8h
     BMC r5, r1, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 push:
-    ADDI64 r254, r254, -176d
-    ST r31, r254, 0a, 176h
+    ADDI64 r254, r254, -168d
+    ST r31, r254, 0a, 168h
     CP r32, r3
     LI64 r33, 1d
     LD r34, r2, 8a, 8h
     LD r35, r2, 16a, 8h
     CP r36, r2
     JNE r35, r34, :0
-    LI64 r37, 0d
-    JNE r35, r37, :1
-    CP r38, r33
+    JNE r35, r0, :1
+    CP r37, r33
     JMP :2
- 1: MULI64 r38, r35, 2d
- 2: LI64 r39, 8d
-    MUL64 r2, r38, r39
-    CP r3, r39
+ 1: MULI64 r37, r35, 2d
+ 2: LI64 r38, 8d
+    MUL64 r2, r37, r38
+    CP r3, r38
     JAL r31, r0, :malloc
-    CP r40, r1
-    CP r41, r36
-    ST r38, r41, 16a, 8h
-    LI64 r1, 0d
-    CP r42, r40
-    JNE r42, r1, :3
+    CP r39, r36
+    ST r37, r39, 16a, 8h
+    JNE r1, r0, :3
+    CP r1, r0
     JMP :4
- 3: CP r40, r42
-    MULI64 r43, r34, 8d
-    LD r44, r41, 0a, 8h
-    ADD64 r45, r44, r43
-    CP r46, r40
- 9: LD r2, r41, 0a, 8h
-    LD r47, r41, 8a, 8h
-    JNE r45, r44, :5
-    JEQ r47, r37, :6
-    CP r4, r39
-    MUL64 r3, r47, r4
+ 3: CP r40, r1
+    CP r1, r0
+    MULI64 r41, r34, 8d
+    LD r42, r39, 0a, 8h
+    ADD64 r43, r42, r41
+    CP r44, r40
+ 9: LD r2, r39, 0a, 8h
+    LD r45, r39, 8a, 8h
+    JNE r43, r42, :5
+    JEQ r45, r1, :6
+    CP r4, r38
+    MUL64 r3, r45, r4
     JAL r31, r0, :free
-    CP r1, r40
+    CP r46, r40
     JMP :7
- 6: CP r1, r40
- 7: ST r1, r41, 0a, 8h
+ 6: CP r46, r40
+ 7: ST r46, r39, 0a, 8h
     JMP :8
- 5: CP r1, r40
-    CP r4, r39
-    ADDI64 r48, r46, 8d
-    ADDI64 r42, r44, 8d
-    LD r49, r44, 0a, 8h
-    ST r49, r46, 0a, 8h
-    CP r44, r42
-    CP r46, r48
+ 5: CP r4, r38
+    CP r46, r40
+    ADDI64 r47, r44, 8d
+    ADDI64 r48, r42, 8d
+    LD r49, r42, 0a, 8h
+    ST r49, r44, 0a, 8h
+    CP r42, r48
+    CP r44, r47
     JMP :9
- 0: CP r41, r36
- 8: LD r50, r41, 8a, 8h
-    MULI64 r51, r50, 8d
-    LD r52, r41, 0a, 8h
-    ADD64 r1, r52, r51
+ 0: CP r39, r36
+ 8: LD r35, r39, 8a, 8h
+    MULI64 r50, r35, 8d
+    LD r46, r39, 0a, 8h
+    ADD64 r1, r46, r50
     CP r3, r32
     ST r3, r1, 0a, 8h
-    ADD64 r39, r50, r33
-    ST r39, r41, 8a, 8h
- 4: LD r31, r254, 0a, 176h
-    ADDI64 r254, r254, 176d
+    ADD64 r51, r35, r33
+    ST r51, r39, 8a, 8h
+ 4: LD r31, r254, 0a, 168h
+    ADDI64 r254, r254, 168d
     JALA r0, r31, 0a
-code size: 929
+code size: 899
 ret: 69
 status: Ok(())
diff --git a/lang/tests/son_tests_global_aliasing_overptimization.txt b/lang/tests/son_tests_global_aliasing_overptimization.txt
index 9fe9282e..9c9b3a69 100644
--- a/lang/tests/son_tests_global_aliasing_overptimization.txt
+++ b/lang/tests/son_tests_global_aliasing_overptimization.txt
@@ -1,7 +1,6 @@
 clobber:
-    LRA r1, r0, :var
-    LI64 r3, 0d
-    ST r3, r1, 0a, 8h
+    LRA r3, r0, :var
+    ST r0, r3, 0a, 8h
     JALA r0, r31, 0a
 main:
     ADDI64 r254, r254, -24d
@@ -14,6 +13,6 @@ main:
     LD r31, r254, 0a, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
-code size: 166
+code size: 156
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_global_variable_wiredness.txt b/lang/tests/son_tests_global_variable_wiredness.txt
index 448d583f..ee9729a1 100644
--- a/lang/tests/son_tests_global_variable_wiredness.txt
+++ b/lang/tests/son_tests_global_variable_wiredness.txt
@@ -1,23 +1,22 @@
 inb:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -40d
-    ST r31, r254, 0a, 40h
+    ADDI64 r254, r254, -32d
+    ST r31, r254, 0a, 32h
     LRA r32, r0, :ports
     LD r33, r32, 0a, 1h
     ANDI r33, r33, 255d
     JNE r33, r0, :0
     JMP :1
  0: JAL r31, r0, :inb
-    LI64 r34, 0d
-    CMPU r35, r1, r34
-    CMPUI r35, r35, 0d
-    NOT r35, r35
-    ST r35, r32, 0a, 1h
- 1: LD r31, r254, 0a, 40h
-    ADDI64 r254, r254, 40d
+    CMPU r34, r1, r0
+    CMPUI r34, r34, 0d
+    NOT r34, r34
+    ST r34, r32, 0a, 1h
+ 1: LD r31, r254, 0a, 32h
+    ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
-code size: 178
+code size: 161
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_global_variables.txt b/lang/tests/son_tests_global_variables.txt
index c8a01e66..2af554bb 100644
--- a/lang/tests/son_tests_global_variables.txt
+++ b/lang/tests/son_tests_global_variables.txt
@@ -1,8 +1,8 @@
 main:
-    LRA r2, r0, :complex_global_var
-    LD r3, r2, 0a, 8h
-    ADDI64 r1, r3, 5d
-    ST r1, r2, 0a, 8h
+    LRA r3, r0, :complex_global_var
+    LD r5, r3, 0a, 8h
+    ADDI64 r1, r5, 5d
+    ST r1, r3, 0a, 8h
     JALA r0, r31, 0a
 code size: 71
 ret: 55
diff --git a/lang/tests/son_tests_hex_octal_binary_literals.txt b/lang/tests/son_tests_hex_octal_binary_literals.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_hex_octal_binary_literals.txt
+++ b/lang/tests/son_tests_hex_octal_binary_literals.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_idk.txt b/lang/tests/son_tests_idk.txt
index 542ebd2f..66945eeb 100644
--- a/lang/tests/son_tests_idk.txt
+++ b/lang/tests/son_tests_idk.txt
@@ -1,20 +1,20 @@
 main:
     ADDI64 r254, r254, -128d
-    LI8 r6, 69b
-    LI64 r5, 128d
-    LI64 r7, 0d
-    ADDI64 r4, r254, 0d
- 2: LD r1, r254, 42a, 1h
-    JLTU r7, r5, :0
-    ANDI r1, r1, 255d
+    LI8 r8, 69b
+    LI64 r7, 128d
+    CP r9, r0
+    ADDI64 r6, r254, 0d
+ 2: LD r3, r254, 42a, 1h
+    JLTU r9, r7, :0
+    ANDI r1, r3, 255d
     JMP :1
- 0: ADDI64 r8, r7, 1d
-    ADD64 r3, r4, r7
-    ST r6, r3, 0a, 1h
-    CP r7, r8
+ 0: ADDI64 r10, r9, 1d
+    ADD64 r5, r6, r9
+    ST r8, r5, 0a, 1h
+    CP r9, r10
     JMP :2
  1: ADDI64 r254, r254, 128d
     JALA r0, r31, 0a
-code size: 145
+code size: 138
 ret: 69
 status: Ok(())
diff --git a/lang/tests/son_tests_infinite_loop_after_peephole.txt b/lang/tests/son_tests_infinite_loop_after_peephole.txt
index e7d94df2..69fa9030 100644
--- a/lang/tests/son_tests_infinite_loop_after_peephole.txt
+++ b/lang/tests/son_tests_infinite_loop_after_peephole.txt
@@ -1,9 +1,9 @@
 main:
-    LI64 r2, 0d
- 0: ADDI64 r2, r2, 1d
+    CP r4, r0
+ 0: ADDI64 r4, r4, 1d
     JMP :0
     JALA r0, r31, 0a
 timed out
-code size: 45
+code size: 38
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_inline.txt b/lang/tests/son_tests_inline.txt
index f144cb0e..264cf2fd 100644
--- a/lang/tests/son_tests_inline.txt
+++ b/lang/tests/son_tests_inline.txt
@@ -1,20 +1,19 @@
 main:
     LI64 r2, 8d
     ECA 
-    LI64 r10, 6d
-    LRA r6, r0, :gb
-    LI64 r9, 0d
-    LD r11, r6, 0a, 8h
-    CMPU r12, r11, r9
+    LI64 r11, 6d
+    LRA r8, r0, :gb
+    LD r10, r8, 0a, 8h
+    CMPU r12, r10, r0
     CMPUI r12, r12, 0d
-    ORI r2, r12, 0d
+    OR r2, r12, r0
     ANDI r2, r2, 255d
     JNE r2, r0, :0
-    CP r7, r10
+    CP r7, r11
     JMP :1
  0: LI64 r7, 1d
- 1: SUB64 r1, r7, r10
+ 1: SUB64 r1, r7, r11
     JALA r0, r31, 0a
-code size: 142
+code size: 125
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_inline_test.txt b/lang/tests/son_tests_inline_test.txt
index d9ecdcd9..a19ada5b 100644
--- a/lang/tests/son_tests_inline_test.txt
+++ b/lang/tests/son_tests_inline_test.txt
@@ -1,28 +1,24 @@
 main:
-    ADDI64 r254, r254, -32d
-    ST r31, r254, 0a, 32h
+    ADDI64 r254, r254, -8d
+    ST r31, r254, 0a, 8h
     JAL r31, r0, :scalar_values
-    LI64 r32, 0d
-    CP r33, r32
-    JEQ r1, r33, :0
+    JEQ r1, r0, :0
     LI64 r1, 1d
     JMP :1
  0: JAL r31, r0, :structs
-    CP r34, r33
-    JEQ r1, r34, :2
+    JEQ r1, r0, :2
     JAL r31, r0, :structs
     JMP :1
- 2: CP r1, r34
-    CP r33, r34
- 1: LD r31, r254, 0a, 32h
-    ADDI64 r254, r254, 32d
+ 2: CP r1, r0
+ 1: LD r31, r254, 0a, 8h
+    ADDI64 r254, r254, 8d
     JALA r0, r31, 0a
 scalar_values:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
 structs:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 182
+code size: 149
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_inlining_issues.txt b/lang/tests/son_tests_inlining_issues.txt
index 896a6f59..e8fd8ac8 100644
--- a/lang/tests/son_tests_inlining_issues.txt
+++ b/lang/tests/son_tests_inlining_issues.txt
@@ -1,32 +1,30 @@
 main:
-    ADDI64 r254, r254, -106d
-    ST r31, r254, 58a, 48h
+    ADDI64 r254, r254, -90d
+    ST r31, r254, 58a, 32h
     ADDI64 r32, r254, 33d
     ADDI64 r2, r254, 34d
     ADDI64 r6, r254, 1d
-    LI64 r33, 0d
     ADDI64 r4, r254, 17d
     ST r32, r254, 34a, 8h
-    LI64 r34, 100d
+    LI64 r33, 100d
     ADDI64 r7, r254, 0d
-    LI8 r35, 1b
-    ST r33, r254, 1a, 8h
-    ST r33, r254, 17a, 8h
-    ST r34, r254, 42a, 8h
-    LI8 r36, 0b
-    ST r35, r254, 0a, 1h
-    ST r33, r254, 9a, 8h
-    ST r33, r254, 25a, 8h
-    ST r34, r254, 50a, 8h
-    ST r36, r254, 33a, 1h
+    LI8 r34, 1b
+    ST r0, r254, 1a, 8h
+    ST r0, r254, 17a, 8h
+    ST r33, r254, 42a, 8h
+    ST r34, r254, 0a, 1h
+    ST r0, r254, 9a, 8h
+    ST r0, r254, 25a, 8h
+    ST r33, r254, 50a, 8h
+    ST r0, r254, 33a, 1h
     CP r3, r4
     CP r5, r6
     LD r3, r3, 0a, 16h
     LD r5, r5, 0a, 16h
     LD r7, r7, 0a, 1h
     JAL r31, r0, :put_filled_rect
-    LD r31, r254, 58a, 48h
-    ADDI64 r254, r254, 106d
+    LD r31, r254, 58a, 32h
+    ADDI64 r254, r254, 90d
     JALA r0, r31, 0a
 put_filled_rect:
     ADDI64 r254, r254, -212d
@@ -38,72 +36,74 @@ put_filled_rect:
     ST r7, r254, 75a, 1h
     ADDI64 r7, r254, 75d
     LI64 r8, 25d
-    LI64 r32, 2d
-    LI64 r6, 8d
-    ADDI64 r33, r254, 25d
-    ADDI64 r34, r254, 50d
-    LI8 r35, 5b
-    ST r35, r254, 25a, 1h
-    LD r36, r5, 0a, 8h
-    ST r36, r254, 26a, 4h
-    LI64 r37, 1d
-    ST r37, r254, 30a, 4h
+    LI64 r6, 2d
+    LI64 r9, 8d
+    ADDI64 r32, r254, 25d
+    ADDI64 r33, r254, 50d
+    LI8 r34, 5b
+    ST r34, r254, 25a, 1h
+    LD r35, r5, 0a, 8h
+    ST r35, r254, 26a, 4h
+    LI64 r36, 1d
+    ST r36, r254, 30a, 4h
     ST r7, r254, 34a, 8h
-    ST r35, r254, 50a, 1h
-    ST r36, r254, 51a, 4h
-    ST r37, r254, 55a, 4h
+    ST r34, r254, 50a, 1h
+    ST r35, r254, 51a, 4h
+    ST r36, r254, 55a, 4h
     ST r7, r254, 59a, 8h
-    CP r38, r7
-    LD r7, r3, 8a, 8h
-    LD r39, r5, 8a, 8h
-    ADD64 r11, r39, r7
-    SUB64 r4, r11, r37
-    LD r40, r2, 8a, 8h
-    MUL64 r5, r40, r4
-    LD r9, r2, 0a, 8h
-    ADD64 r10, r9, r5
-    LD r2, r3, 0a, 8h
-    ADD64 r41, r2, r10
-    MUL64 r3, r40, r7
-    ADD64 r4, r9, r3
-    ADD64 r42, r2, r4
- 3: JGTU r39, r37, :0
-    JNE r39, r37, :1
+    CP r37, r7
+    LD r4, r3, 8a, 8h
+    LD r38, r5, 8a, 8h
+    ADD64 r1, r38, r4
+    SUB64 r5, r1, r36
+    LD r39, r2, 8a, 8h
+    MUL64 r7, r39, r5
+    LD r10, r2, 0a, 8h
+    ADD64 r11, r10, r7
+    LD r5, r3, 0a, 8h
+    ADD64 r40, r5, r11
+    MUL64 r4, r39, r4
+    ADD64 r7, r10, r4
+    ADD64 r41, r5, r7
+ 3: JGTU r38, r36, :0
+    JNE r38, r36, :1
     ADDI64 r4, r254, 0d
-    ST r35, r254, 0a, 1h
-    ST r36, r254, 1a, 4h
-    ST r37, r254, 5a, 4h
-    ST r38, r254, 9a, 8h
-    ST r42, r254, 17a, 8h
-    CP r2, r6
-    CP r3, r32
+    ST r34, r254, 0a, 1h
+    ST r35, r254, 1a, 4h
+    ST r36, r254, 5a, 4h
+    ST r37, r254, 9a, 8h
+    ST r41, r254, 17a, 8h
+    CP r2, r9
+    CP r3, r6
     CP r5, r8
     ECA 
     JMP :1
  1: JMP :2
- 0: CP r3, r32
-    CP r43, r6
-    CP r44, r8
-    ST r42, r254, 67a, 8h
-    CP r2, r43
-    CP r4, r34
-    CP r5, r44
-    ECA 
-    ST r41, r254, 42a, 8h
-    CP r2, r43
-    CP r3, r32
+ 0: CP r3, r6
+    CP r42, r9
+    CP r43, r8
+    ST r41, r254, 67a, 8h
+    CP r44, r3
+    CP r2, r42
     CP r4, r33
-    CP r5, r44
+    CP r5, r43
     ECA 
-    SUB64 r41, r41, r40
-    ADD64 r42, r40, r42
-    SUB64 r39, r39, r32
-    CP r6, r43
-    CP r8, r44
+    ST r40, r254, 42a, 8h
+    CP r2, r42
+    CP r3, r44
+    CP r4, r32
+    CP r5, r43
+    ECA 
+    SUB64 r40, r40, r39
+    ADD64 r41, r39, r41
+    SUB64 r38, r38, r44
+    CP r6, r44
+    CP r8, r43
+    CP r9, r42
     JMP :3
  2: LD r32, r254, 108a, 104h
     ADDI64 r254, r254, 212d
     JALA r0, r31, 0a
-code size: 917
+code size: 910
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_intcast_store.txt b/lang/tests/son_tests_intcast_store.txt
index 8e8874ca..b598fbfd 100644
--- a/lang/tests/son_tests_intcast_store.txt
+++ b/lang/tests/son_tests_intcast_store.txt
@@ -1,20 +1,19 @@
 main:
-    ADDI64 r254, r254, -32d
-    ST r31, r254, 16a, 16h
+    ADDI64 r254, r254, -24d
+    ST r31, r254, 16a, 8h
     ADDI64 r3, r254, 0d
     ADDI64 r2, r254, 8d
-    LI64 r32, 0d
-    ST r32, r254, 0a, 8h
-    ST r32, r254, 8a, 8h
+    ST r0, r254, 0a, 8h
+    ST r0, r254, 8a, 8h
     LI64 r4, 1024d
     JAL r31, r0, :set
     ANDI r1, r1, 4294967295d
-    LD r31, r254, 16a, 16h
-    ADDI64 r254, r254, 32d
+    LD r31, r254, 16a, 8h
+    ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 set:
     CP r1, r4
     JALA r0, r31, 0a
-code size: 167
+code size: 157
 ret: 1024
 status: Ok(())
diff --git a/lang/tests/son_tests_integer_inference_issues.txt b/lang/tests/son_tests_integer_inference_issues.txt
index e4633ccc..e3de9ac8 100644
--- a/lang/tests/son_tests_integer_inference_issues.txt
+++ b/lang/tests/son_tests_integer_inference_issues.txt
@@ -8,10 +8,10 @@ integer_range:
     ECA 
     CP r2, r32
     CP r3, r33
-    SUB64 r11, r3, r2
-    ADDI64 r3, r11, 1d
-    DIRU64 r0, r3, r1, r3
-    ADD64 r1, r3, r2
+    SUB64 r3, r3, r2
+    ADDI64 r3, r3, 1d
+    DIRU64 r0, r5, r1, r3
+    ADD64 r1, r5, r2
     LD r32, r254, 0a, 16h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
@@ -19,11 +19,11 @@ main:
     ADDI64 r254, r254, -8d
     ST r31, r254, 0a, 8h
     LI64 r3, 1000d
-    LI64 r2, 0d
+    CP r2, r0
     JAL r31, r0, :integer_range
     LD r31, r254, 0a, 8h
     ADDI64 r254, r254, 8d
     JALA r0, r31, 0a
-code size: 210
+code size: 203
 ret: 42
 status: Ok(())
diff --git a/lang/tests/son_tests_loop_stores.txt b/lang/tests/son_tests_loop_stores.txt
index 19e9d458..1fa37899 100644
--- a/lang/tests/son_tests_loop_stores.txt
+++ b/lang/tests/son_tests_loop_stores.txt
@@ -1,16 +1,15 @@
 main:
     ADDI64 r254, r254, -8d
-    LI64 r3, 0d
-    LI64 r2, 10d
-    ST r2, r254, 0a, 8h
+    LI64 r3, 10d
+    ST r3, r254, 0a, 8h
  2: LD r1, r254, 0a, 8h
-    JNE r1, r3, :0
+    JNE r1, r0, :0
     JMP :1
  0: ADDI64 r11, r1, -1d
     ST r11, r254, 0a, 8h
     JMP :2
  1: ADDI64 r254, r254, 8d
     JALA r0, r31, 0a
-code size: 126
+code size: 116
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_loops.txt b/lang/tests/son_tests_loops.txt
index 1ddf33af..13c3157b 100644
--- a/lang/tests/son_tests_loops.txt
+++ b/lang/tests/son_tests_loops.txt
@@ -1,15 +1,14 @@
 fib:
-    LI64 r4, 1d
-    LI64 r5, 0d
-    CP r1, r5
-    CP r10, r4
- 2: JNE r2, r5, :0
+    LI64 r6, 1d
+    CP r7, r0
+    CP r1, r7
+    CP r12, r6
+ 2: JNE r2, r7, :0
     JMP :1
- 0: ADD64 r1, r10, r1
-    SUB64 r2, r2, r4
-    CP r3, r1
-    CP r1, r10
-    CP r10, r3
+ 0: ADD64 r3, r12, r1
+    SUB64 r2, r2, r6
+    CP r1, r12
+    CP r12, r3
     JMP :2
  1: JALA r0, r31, 0a
 main:
@@ -20,6 +19,6 @@ main:
     LD r31, r254, 0a, 8h
     ADDI64 r254, r254, 8d
     JALA r0, r31, 0a
-code size: 153
+code size: 143
 ret: 55
 status: Ok(())
diff --git a/lang/tests/son_tests_memory_swap.txt b/lang/tests/son_tests_memory_swap.txt
index 9fae971f..e494653e 100644
--- a/lang/tests/son_tests_memory_swap.txt
+++ b/lang/tests/son_tests_memory_swap.txt
@@ -1,18 +1,17 @@
 decide:
     ADDI64 r254, r254, -24d
-    ADDI64 r5, r254, 0d
+    ADDI64 r7, r254, 0d
     ST r2, r254, 0a, 8h
-    LI64 r8, 0d
-    ST r8, r254, 8a, 8h
-    ST r8, r254, 16a, 8h
-    BMC r5, r1, 24h
+    ST r0, r254, 8a, 8h
+    ST r0, r254, 16a, 8h
+    BMC r7, r1, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 main:
     ADDI64 r254, r254, -112d
     ST r31, r254, 72a, 40h
     ADDI64 r32, r254, 48d
-    LI64 r2, 0d
+    CP r2, r0
     CP r1, r32
     JAL r31, r0, :decide
     ADDI64 r1, r254, 24d
@@ -27,6 +26,6 @@ main:
     LD r31, r254, 72a, 40h
     ADDI64 r254, r254, 112d
     JALA r0, r31, 0a
-code size: 275
+code size: 258
 ret: 1
 status: Ok(())
diff --git a/lang/tests/son_tests_more_if_opts.txt b/lang/tests/son_tests_more_if_opts.txt
index 378e9256..fdcce38d 100644
--- a/lang/tests/son_tests_more_if_opts.txt
+++ b/lang/tests/son_tests_more_if_opts.txt
@@ -1,27 +1,26 @@
 main:
-    ADDI64 r254, r254, -32d
-    ST r31, r254, 0a, 32h
+    ADDI64 r254, r254, -24d
+    ST r31, r254, 0a, 24h
     JAL r31, r0, :opaque
     CP r32, r1
     JAL r31, r0, :opaque
-    LI64 r33, 0d
     CP r1, r32
-    JNE r1, r33, :0
+    JNE r1, r0, :0
     CP r32, r1
-    LI64 r1, 0d
-    CP r34, r32
+    CP r1, r0
+    CP r33, r32
     JMP :1
- 0: CP r34, r1
-    LD r1, r34, 0a, 8h
- 1: JEQ r34, r33, :2
-    LD r1, r34, 0a, 8h
+ 0: CP r33, r1
+    LD r1, r33, 0a, 8h
+ 1: JEQ r33, r0, :2
+    LD r1, r33, 0a, 8h
     JMP :2
- 2: LD r31, r254, 0a, 32h
-    ADDI64 r254, r254, 32d
+ 2: LD r31, r254, 0a, 24h
+    ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 opaque:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 183
+code size: 159
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_null_check_in_the_loop.txt b/lang/tests/son_tests_null_check_in_the_loop.txt
index c7735b3f..a8403376 100644
--- a/lang/tests/son_tests_null_check_in_the_loop.txt
+++ b/lang/tests/son_tests_null_check_in_the_loop.txt
@@ -1,34 +1,32 @@
 main:
-    ADDI64 r254, r254, -38d
-    ST r31, r254, 6a, 32h
-    LI8 r32, 0b
-    ADDI64 r33, r254, 0d
+    ADDI64 r254, r254, -30d
+    ST r31, r254, 6a, 24h
+    ADDI64 r32, r254, 0d
  2: JAL r31, r0, :return_fn
     ST r1, r254, 0a, 6h
-    LD r34, r254, 0a, 1h
-    ANDI r34, r34, 255d
-    ANDI r32, r32, 255d
-    JEQ r34, r32, :0
+    LD r33, r254, 0a, 1h
+    ANDI r33, r33, 255d
+    ANDI r0, r0, 255d
+    JEQ r33, r0, :0
     LI64 r1, 1d
     JMP :1
  0: JMP :2
- 1: LD r31, r254, 6a, 32h
-    ADDI64 r254, r254, 38d
+ 1: LD r31, r254, 6a, 24h
+    ADDI64 r254, r254, 30d
     JALA r0, r31, 0a
 return_fn:
     ADDI64 r254, r254, -6d
-    LI8 r4, 1b
-    ADDI64 r3, r254, 0d
-    ST r4, r254, 0a, 1h
-    LI8 r4, 0b
-    ST r4, r254, 1a, 1h
-    ST r4, r254, 2a, 1h
-    ST r4, r254, 3a, 1h
-    ST r4, r254, 4a, 1h
-    ST r4, r254, 5a, 1h
-    LD r1, r3, 0a, 6h
+    LI8 r5, 1b
+    ADDI64 r4, r254, 0d
+    ST r5, r254, 0a, 1h
+    ST r0, r254, 1a, 1h
+    ST r0, r254, 2a, 1h
+    ST r0, r254, 3a, 1h
+    ST r0, r254, 4a, 1h
+    ST r0, r254, 5a, 1h
+    LD r1, r4, 0a, 6h
     ADDI64 r254, r254, 6d
     JALA r0, r31, 0a
-code size: 302
+code size: 296
 ret: 1
 status: Ok(())
diff --git a/lang/tests/son_tests_null_check_returning_small_global.txt b/lang/tests/son_tests_null_check_returning_small_global.txt
index 4e6e3ef9..6c7d9c01 100644
--- a/lang/tests/son_tests_null_check_returning_small_global.txt
+++ b/lang/tests/son_tests_null_check_returning_small_global.txt
@@ -1,80 +1,76 @@
 foo:
-    ADDI64 r254, r254, -200d
-    ST r31, r254, 80a, 120h
+    ADDI64 r254, r254, -184d
+    ST r31, r254, 80a, 104h
     ADDI64 r32, r254, 64d
     LRA r3, r0, :some_file
     JAL r31, r0, :get
     ST r1, r254, 64a, 16h
-    LI8 r33, 0b
-    LD r34, r254, 64a, 1h
-    ANDI r34, r34, 255d
+    LD r33, r254, 64a, 1h
     ANDI r33, r33, 255d
-    JNE r34, r33, :0
-    ADDI64 r35, r254, 48d
-    ST r33, r254, 48a, 1h
-    LD r1, r35, 0a, 16h
+    ANDI r0, r0, 255d
+    JNE r33, r0, :0
+    ADDI64 r34, r254, 48d
+    ST r0, r254, 48a, 1h
+    LD r1, r34, 0a, 16h
     JMP :1
- 0: LI8 r36, 1b
-    LI64 r37, 4d
-    LD r38, r254, 72a, 8h
-    JNE r38, r37, :2
-    ADDI64 r39, r254, 32d
-    ST r36, r254, 32a, 1h
-    LI64 r40, 2d
-    ST r40, r254, 40a, 8h
-    LD r1, r39, 0a, 16h
+ 0: LI8 r35, 1b
+    LI64 r36, 4d
+    LD r37, r254, 72a, 8h
+    JNE r37, r36, :2
+    ADDI64 r38, r254, 32d
+    ST r35, r254, 32a, 1h
+    LI64 r39, 2d
+    ST r39, r254, 40a, 8h
+    LD r1, r38, 0a, 16h
     JMP :1
- 2: LRA r41, r0, :MAGIC
-    LD r42, r41, 0a, 8h
-    JNE r42, r38, :3
-    ADDI64 r43, r254, 16d
-    ST r36, r254, 16a, 1h
-    LI64 r44, 0d
-    ST r44, r254, 24a, 8h
+ 2: LRA r40, r0, :MAGIC
+    LD r41, r40, 0a, 8h
+    JNE r41, r37, :3
+    ADDI64 r42, r254, 16d
+    ST r35, r254, 16a, 1h
+    ST r0, r254, 24a, 8h
+    LD r1, r42, 0a, 16h
+    JMP :1
+ 3: ADDI64 r43, r254, 0d
+    ST r0, r254, 0a, 1h
     LD r1, r43, 0a, 16h
-    JMP :1
- 3: ADDI64 r45, r254, 0d
-    ST r33, r254, 0a, 1h
-    LD r1, r45, 0a, 16h
- 1: LD r31, r254, 80a, 120h
-    ADDI64 r254, r254, 200d
+ 1: LD r31, r254, 80a, 104h
+    ADDI64 r254, r254, 184d
     JALA r0, r31, 0a
 get:
     ADDI64 r254, r254, -32d
-    LD r3, r3, 0a, 1h
-    LRA r5, r0, :MAGIC
-    ANDI r9, r3, 255d
-    LD r8, r5, 0a, 8h
-    JNE r8, r9, :0
-    LI8 r2, 1b
-    ADDI64 r1, r254, 16d
-    ST r2, r254, 16a, 1h
-    ST r8, r254, 24a, 8h
-    LD r1, r1, 0a, 16h
+    LD r5, r3, 0a, 1h
+    LRA r7, r0, :MAGIC
+    ANDI r11, r5, 255d
+    LD r10, r7, 0a, 8h
+    JNE r10, r11, :0
+    LI8 r4, 1b
+    ADDI64 r3, r254, 16d
+    ST r4, r254, 16a, 1h
+    ST r10, r254, 24a, 8h
+    LD r1, r3, 0a, 16h
     JMP :1
- 0: ADDI64 r7, r254, 0d
-    LI8 r9, 0b
-    ST r9, r254, 0a, 1h
-    LD r1, r7, 0a, 16h
+ 0: ADDI64 r9, r254, 0d
+    ST r0, r254, 0a, 1h
+    LD r1, r9, 0a, 16h
  1: ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -48d
-    ST r31, r254, 16a, 32h
+    ADDI64 r254, r254, -40d
+    ST r31, r254, 16a, 24h
     ADDI64 r32, r254, 0d
     JAL r31, r0, :foo
     ST r1, r254, 0a, 16h
-    LI8 r33, 0b
-    LD r34, r254, 0a, 1h
-    ANDI r34, r34, 255d
+    LD r33, r254, 0a, 1h
     ANDI r33, r33, 255d
-    JNE r34, r33, :0
+    ANDI r0, r0, 255d
+    JNE r33, r0, :0
     LI64 r1, 100d
     JMP :1
  0: LD r1, r254, 8a, 8h
- 1: LD r31, r254, 16a, 32h
-    ADDI64 r254, r254, 48d
+ 1: LD r31, r254, 16a, 24h
+    ADDI64 r254, r254, 40d
     JALA r0, r31, 0a
-code size: 768
+code size: 749
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_null_check_test.txt b/lang/tests/son_tests_null_check_test.txt
index 883264a3..4326b94a 100644
--- a/lang/tests/son_tests_null_check_test.txt
+++ b/lang/tests/son_tests_null_check_test.txt
@@ -1,24 +1,23 @@
 get_ptr:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -40d
-    ST r31, r254, 0a, 40h
+    ADDI64 r254, r254, -32d
+    ST r31, r254, 0a, 32h
     JAL r31, r0, :get_ptr
-    LI64 r32, 0d
-    JNE r1, r32, :0
-    LI64 r1, 0d
+    JNE r1, r0, :0
+    CP r1, r0
     JMP :1
- 0: LI64 r33, 10d
-    CP r34, r1
- 2: LD r1, r34, 0a, 8h
-    JEQ r1, r33, :1
-    ADDI64 r35, r1, 1d
-    ST r35, r34, 0a, 8h
+ 0: LI64 r32, 10d
+    CP r33, r1
+ 2: LD r1, r33, 0a, 8h
+    JEQ r1, r32, :1
+    ADDI64 r34, r1, 1d
+    ST r34, r33, 0a, 8h
     JMP :2
- 1: LD r31, r254, 0a, 40h
-    ADDI64 r254, r254, 40d
+ 1: LD r31, r254, 0a, 32h
+    ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
-code size: 185
+code size: 161
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_nullable_structure.txt b/lang/tests/son_tests_nullable_structure.txt
index 4ee4ab41..04fc68eb 100644
--- a/lang/tests/son_tests_nullable_structure.txt
+++ b/lang/tests/son_tests_nullable_structure.txt
@@ -1,6 +1,6 @@
 main:
-    ADDI64 r254, r254, -122d
-    ST r31, r254, 26a, 96h
+    ADDI64 r254, r254, -98d
+    ST r31, r254, 26a, 72h
     JAL r31, r0, :returner_fn
     CP r32, r1
     ADDI64 r1, r254, 2d
@@ -8,52 +8,48 @@ main:
     ADDI64 r33, r254, 0d
     JAL r31, r0, :returner_cn
     ST r1, r254, 0a, 2h
-    LI8 r34, 0b
-    LI8 r35, 0b
-    LD r36, r254, 2a, 1h
+    LD r34, r254, 2a, 1h
     CP r1, r32
-    CMPU r37, r1, r34
-    CMPUI r37, r37, 0d
-    CMPU r38, r36, r35
+    CMPU r35, r1, r0
+    CMPUI r35, r35, 0d
+    CMPU r32, r34, r0
+    CMPUI r32, r32, 0d
+    LD r36, r254, 0a, 1h
+    AND r37, r32, r35
+    CMPU r38, r36, r0
     CMPUI r38, r38, 0d
-    LD r39, r254, 0a, 1h
-    AND r40, r38, r37
-    CMPU r41, r39, r35
-    CMPUI r41, r41, 0d
-    AND r42, r41, r40
-    ANDI r42, r42, 255d
-    JNE r42, r0, :0
-    LI64 r1, 0d
+    AND r39, r38, r37
+    ANDI r39, r39, 255d
+    JNE r39, r0, :0
+    CP r1, r0
     JMP :1
  0: LI64 r1, 1d
- 1: LD r31, r254, 26a, 96h
-    ADDI64 r254, r254, 122d
+ 1: LD r31, r254, 26a, 72h
+    ADDI64 r254, r254, 98d
     JALA r0, r31, 0a
 returner_bn:
     ADDI64 r254, r254, -24d
-    LI8 r6, 1b
-    ADDI64 r5, r254, 0d
-    ST r6, r254, 0a, 1h
-    LI64 r6, 0d
-    ST r6, r254, 8a, 8h
-    ST r6, r254, 16a, 8h
-    BMC r5, r1, 24h
+    LI8 r7, 1b
+    ADDI64 r6, r254, 0d
+    ST r7, r254, 0a, 1h
+    ST r0, r254, 8a, 8h
+    ST r0, r254, 16a, 8h
+    BMC r6, r1, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 returner_cn:
     ADDI64 r254, r254, -2d
-    LI8 r4, 1b
-    ADDI64 r3, r254, 0d
-    ST r4, r254, 0a, 1h
-    LI8 r4, 0b
-    ST r4, r254, 1a, 1h
-    LD r1, r3, 0a, 2h
+    LI8 r5, 1b
+    ADDI64 r4, r254, 0d
+    ST r5, r254, 0a, 1h
+    ST r0, r254, 1a, 1h
+    LD r1, r4, 0a, 2h
     ADDI64 r254, r254, 2d
     JALA r0, r31, 0a
 returner_fn:
-    LD r1, r254, 0a, 0h
-    ORI r1, r1, 128d
+    LD r3, r254, 0a, 0h
+    ORI r1, r3, 128d
     JALA r0, r31, 0a
-code size: 480
+code size: 454
 ret: 1
 status: Ok(())
diff --git a/lang/tests/son_tests_nullable_types.txt b/lang/tests/son_tests_nullable_types.txt
index e82d09ac..688f3007 100644
--- a/lang/tests/son_tests_nullable_types.txt
+++ b/lang/tests/son_tests_nullable_types.txt
@@ -2,10 +2,10 @@ decide:
     LI8 r1, 1b
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -232d
-    ST r31, r254, 80a, 152h
+    ADDI64 r254, r254, -224d
+    ST r31, r254, 80a, 144h
     JAL r31, r0, :decide
-    LI64 r32, 0d
+    CP r32, r0
     ADDI64 r2, r254, 72d
     CP r33, r2
     ANDI r1, r1, 255d
@@ -19,23 +19,22 @@ main:
     LI64 r1, 9001d
     JMP :3
  2: JAL r31, r0, :decide
-    LI8 r36, 0b
     ANDI r1, r1, 255d
     JNE r1, r0, :4
-    LI8 r37, 1b
-    ST r37, r254, 56a, 1h
+    LI8 r36, 1b
+    ST r36, r254, 56a, 1h
     LD r37, r34, 0a, 8h
     ST r37, r254, 64a, 8h
     JMP :5
- 4: ST r36, r254, 56a, 1h
+ 4: ST r0, r254, 56a, 1h
  5: LD r38, r254, 56a, 1h
     ANDI r38, r38, 255d
-    ANDI r36, r36, 255d
-    JEQ r38, r36, :6
+    ANDI r0, r0, 255d
+    JEQ r38, r0, :6
     LI64 r1, 42d
     JMP :3
  6: JAL r31, r0, :decide
-    LI32 r39, 0w
+    CP r39, r0
     ANDI r1, r1, 255d
     JNE r1, r0, :7
     CP r40, r39
@@ -50,9 +49,8 @@ main:
     CP r41, r3
     JAL r31, r0, :new_foo
     ST r1, r254, 40a, 16h
-    LI64 r42, 0d
-    LD r43, r254, 40a, 8h
-    JNE r43, r42, :10
+    LD r42, r254, 40a, 8h
+    JNE r42, r0, :10
     LI64 r1, 999d
     JMP :3
 10: LRA r4, r0, :"foo\0"
@@ -60,7 +58,7 @@ main:
     CP r2, r3
     LD r2, r2, 0a, 16h
     JAL r31, r0, :use_foo
-    ADDI64 r44, r254, 0d
+    ADDI64 r43, r254, 0d
     JAL r31, r0, :no_foo
     ST r1, r254, 0a, 16h
     JAL r31, r0, :decide
@@ -71,8 +69,8 @@ main:
 11: CP r2, r33
     ST r2, r254, 0a, 8h
     ST r35, r254, 8a, 8h
-12: LD r45, r254, 0a, 8h
-    JNE r45, r42, :13
+12: LD r44, r254, 0a, 8h
+    JNE r44, r0, :13
     LI64 r1, 34d
     JMP :3
 13: ADDI64 r1, r254, 16d
@@ -81,47 +79,45 @@ main:
     ANDI r1, r1, 255d
     JNE r1, r0, :14
     JMP :15
-14: ST r36, r254, 16a, 1h
-15: LD r46, r254, 16a, 1h
-    ANDI r46, r46, 255d
-    ANDI r36, r36, 255d
-    JEQ r46, r36, :16
+14: ST r0, r254, 16a, 1h
+15: LD r45, r254, 16a, 1h
+    ANDI r45, r45, 255d
+    ANDI r0, r0, 255d
+    JEQ r45, r0, :16
     LI64 r1, 420d
     JMP :3
-16: LD r47, r254, 0a, 8h
-    LD r48, r47, 0a, 8h
-    ANDI r49, r40, 65535d
-    SUB64 r1, r49, r48
- 3: LD r31, r254, 80a, 152h
-    ADDI64 r254, r254, 232d
+16: LD r46, r254, 0a, 8h
+    LD r47, r46, 0a, 8h
+    ANDI r48, r40, 65535d
+    SUB64 r1, r48, r47
+ 3: LD r31, r254, 80a, 144h
+    ADDI64 r254, r254, 224d
     JALA r0, r31, 0a
 new_bar:
     ADDI64 r254, r254, -24d
-    LI8 r8, 1b
-    ADDI64 r7, r254, 0d
-    ST r8, r254, 0a, 1h
+    LI8 r10, 1b
+    ADDI64 r9, r254, 0d
+    ST r10, r254, 0a, 1h
     ST r2, r254, 8a, 8h
-    LI64 r9, 1d
-    ST r9, r254, 16a, 8h
-    BMC r7, r1, 24h
+    LI64 r11, 1d
+    ST r11, r254, 16a, 8h
+    BMC r9, r1, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 new_foo:
     ADDI64 r254, r254, -24d
-    ADDI64 r3, r254, 0d
-    ADDI64 r2, r254, 8d
-    ST r3, r254, 8a, 8h
-    LI64 r5, 0d
-    ST r5, r254, 16a, 8h
-    LD r1, r2, 0a, 16h
+    ADDI64 r5, r254, 0d
+    ADDI64 r4, r254, 8d
+    ST r5, r254, 8a, 8h
+    ST r0, r254, 16a, 8h
+    LD r1, r4, 0a, 16h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 no_foo:
     ADDI64 r254, r254, -16d
-    ADDI64 r1, r254, 0d
-    LI64 r3, 0d
-    ST r3, r254, 0a, 8h
-    LD r1, r1, 0a, 16h
+    ADDI64 r3, r254, 0d
+    ST r0, r254, 0a, 8h
+    LD r1, r3, 0a, 16h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 use_foo:
@@ -130,6 +126,6 @@ use_foo:
     ADDI64 r2, r254, 0d
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
-code size: 1143
+code size: 1100
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_only_break_loop.txt b/lang/tests/son_tests_only_break_loop.txt
index b353a8cc..62064b74 100644
--- a/lang/tests/son_tests_only_break_loop.txt
+++ b/lang/tests/son_tests_only_break_loop.txt
@@ -2,29 +2,28 @@ inb:
     CP r1, r2
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -32d
-    ST r31, r254, 0a, 32h
-    LI64 r32, 0d
-    LI64 r33, 100d
- 4: CP r2, r33
+    ADDI64 r254, r254, -24d
+    ST r31, r254, 0a, 24h
+    LI64 r32, 100d
+ 4: CP r2, r32
     JAL r31, r0, :inb
-    ANDI r34, r1, 2d
-    JNE r34, r32, :0
+    ANDI r33, r1, 2d
+    JNE r33, r0, :0
     LI64 r2, 96d
-    CP r3, r32
+    CP r3, r0
     JAL r31, r0, :outb
- 3: CP r2, r33
+ 3: CP r2, r32
     JAL r31, r0, :inb
-    JEQ r1, r32, :1
+    JEQ r1, r0, :1
     LI64 r1, 1d
     JMP :2
  1: JMP :3
  0: JMP :4
- 2: LD r31, r254, 0a, 32h
-    ADDI64 r254, r254, 32d
+ 2: LD r31, r254, 0a, 24h
+    ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
 outb:
     JALA r0, r31, 0a
-code size: 198
+code size: 188
 ret: 1
 status: Ok(())
diff --git a/lang/tests/son_tests_optional_from_eca.txt b/lang/tests/son_tests_optional_from_eca.txt
index fe479eb7..00ada79c 100644
--- a/lang/tests/son_tests_optional_from_eca.txt
+++ b/lang/tests/son_tests_optional_from_eca.txt
@@ -1,22 +1,21 @@
 main:
     ADDI64 r254, r254, -16d
-    ADDI64 r3, r254, 0d
-    LI64 r6, 0d
-    CP r3, r6
-    CP r4, r6
-    CP r5, r6
+    ADDI64 r4, r254, 0d
+    CP r3, r0
+    CP r4, r0
+    CP r5, r0
+    CP r6, r0
     ECA 
     ST r1, r254, 0a, 16h
-    LI8 r8, 0b
-    LD r9, r254, 0a, 1h
-    ANDI r9, r9, 255d
-    ANDI r8, r8, 255d
-    JNE r9, r8, :0
+    LD r7, r254, 0a, 1h
+    ANDI r7, r7, 255d
+    ANDI r0, r0, 255d
+    JNE r7, r0, :0
     UN 
  0: LD r1, r254, 8a, 8h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 unknown ecall: 0
-code size: 142
+code size: 132
 ret: 0
 status: Err(Unreachable)
diff --git a/lang/tests/son_tests_overwrite_aliasing_overoptimization.txt b/lang/tests/son_tests_overwrite_aliasing_overoptimization.txt
index 4441af26..c3a469c1 100644
--- a/lang/tests/son_tests_overwrite_aliasing_overoptimization.txt
+++ b/lang/tests/son_tests_overwrite_aliasing_overoptimization.txt
@@ -19,12 +19,12 @@ main:
     JALA r0, r31, 0a
 opaque:
     ADDI64 r254, r254, -16d
-    LI64 r3, 3d
-    ADDI64 r2, r254, 0d
-    ST r3, r254, 0a, 8h
-    LI64 r6, 2d
-    ST r6, r254, 8a, 8h
-    LD r1, r2, 0a, 16h
+    LI64 r5, 3d
+    ADDI64 r4, r254, 0d
+    ST r5, r254, 0a, 8h
+    LI64 r8, 2d
+    ST r8, r254, 8a, 8h
+    LD r1, r4, 0a, 16h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 code size: 307
diff --git a/lang/tests/son_tests_pointer_opts.txt b/lang/tests/son_tests_pointer_opts.txt
index f8db1226..311f353e 100644
--- a/lang/tests/son_tests_pointer_opts.txt
+++ b/lang/tests/son_tests_pointer_opts.txt
@@ -1,6 +1,6 @@
 clobber:
-    LI64 r3, 4d
-    ST r3, r2, 0a, 8h
+    LI64 r5, 4d
+    ST r5, r2, 0a, 8h
     JALA r0, r31, 0a
 main:
     ADDI64 r254, r254, -40d
diff --git a/lang/tests/son_tests_pointers.txt b/lang/tests/son_tests_pointers.txt
index 3376e761..20c9ddf1 100644
--- a/lang/tests/son_tests_pointers.txt
+++ b/lang/tests/son_tests_pointers.txt
@@ -15,8 +15,8 @@ main:
     ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
 modify:
-    LI64 r3, 2d
-    ST r3, r2, 0a, 8h
+    LI64 r5, 2d
+    ST r5, r2, 0a, 8h
     JALA r0, r31, 0a
 code size: 187
 ret: 0
diff --git a/lang/tests/son_tests_reading_idk.txt b/lang/tests/son_tests_reading_idk.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_reading_idk.txt
+++ b/lang/tests/son_tests_reading_idk.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_request_page.txt b/lang/tests/son_tests_request_page.txt
index e249c8f4..470440c9 100644
--- a/lang/tests/son_tests_request_page.txt
+++ b/lang/tests/son_tests_request_page.txt
@@ -1,6 +1,6 @@
 create_back_buffer:
-    ADDI64 r254, r254, -56d
-    ST r31, r254, 0a, 56h
+    ADDI64 r254, r254, -48d
+    ST r31, r254, 0a, 48h
     LI64 r32, 255d
     JGTS r2, r32, :0
     JAL r31, r0, :request_page
@@ -9,23 +9,22 @@ create_back_buffer:
     LI8 r34, 255b
     CP r2, r34
     JAL r31, r0, :request_page
-    LI64 r35, 0d
     CP r2, r33
-    SUB64 r36, r2, r32
- 5: JGTS r36, r35, :2
+    SUB64 r35, r2, r32
+ 5: JGTS r35, r0, :2
     JMP :1
- 2: CP r37, r1
-    JLTS r36, r32, :3
+ 2: CP r36, r1
+    JLTS r35, r32, :3
     CP r2, r34
     JAL r31, r0, :request_page
     JMP :4
- 3: CP r2, r36
+ 3: CP r2, r35
     JAL r31, r0, :request_page
- 4: SUB64 r36, r36, r32
-    CP r1, r37
+ 4: SUB64 r35, r35, r32
+    CP r1, r36
     JMP :5
- 1: LD r31, r254, 0a, 56h
-    ADDI64 r254, r254, 56d
+ 1: LD r31, r254, 0a, 48h
+    ADDI64 r254, r254, 48d
     JALA r0, r31, 0a
 main:
     ADDI64 r254, r254, -8d
@@ -43,6 +42,6 @@ request_page:
     LI64 r2, 3d
     ECA 
     JALA r0, r31, 0a
-code size: 331
+code size: 321
 ret: 42
 status: Ok(())
diff --git a/lang/tests/son_tests_returning_global_struct.txt b/lang/tests/son_tests_returning_global_struct.txt
index ea20c838..a9020adf 100644
--- a/lang/tests/son_tests_returning_global_struct.txt
+++ b/lang/tests/son_tests_returning_global_struct.txt
@@ -19,8 +19,8 @@ main:
     ADDI64 r254, r254, 100d
     JALA r0, r31, 0a
 random_color:
-    LRA r1, r0, :white
-    LD r1, r1, 0a, 4h
+    LRA r3, r0, :white
+    LD r1, r3, 0a, 4h
     JALA r0, r31, 0a
 code size: 241
 ret: 1020
diff --git a/lang/tests/son_tests_returning_optional_issues.txt b/lang/tests/son_tests_returning_optional_issues.txt
index a38591c5..6d3cf8cd 100644
--- a/lang/tests/son_tests_returning_optional_issues.txt
+++ b/lang/tests/son_tests_returning_optional_issues.txt
@@ -1,31 +1,30 @@
 get_format:
     ADDI64 r254, r254, -16d
-    LI8 r5, 1b
-    ADDI64 r4, r254, 0d
-    LRA r3, r0, :BMP
-    ST r5, r254, 0a, 1h
-    LD r6, r3, 0a, 8h
-    ST r6, r254, 8a, 8h
-    LD r1, r4, 0a, 16h
+    LI8 r7, 1b
+    ADDI64 r6, r254, 0d
+    LRA r5, r0, :BMP
+    ST r7, r254, 0a, 1h
+    LD r8, r5, 0a, 8h
+    ST r8, r254, 8a, 8h
+    LD r1, r6, 0a, 16h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -48d
-    ST r31, r254, 16a, 32h
+    ADDI64 r254, r254, -40d
+    ST r31, r254, 16a, 24h
     ADDI64 r32, r254, 0d
     JAL r31, r0, :get_format
     ST r1, r254, 0a, 16h
-    LI8 r33, 0b
-    LD r34, r254, 0a, 1h
-    ANDI r34, r34, 255d
+    LD r33, r254, 0a, 1h
     ANDI r33, r33, 255d
-    JNE r34, r33, :0
+    ANDI r0, r0, 255d
+    JNE r33, r0, :0
     LI64 r1, 1d
     JMP :1
  0: LD r1, r254, 8a, 8h
- 1: LD r31, r254, 16a, 32h
-    ADDI64 r254, r254, 48d
+ 1: LD r31, r254, 16a, 24h
+    ADDI64 r254, r254, 40d
     JALA r0, r31, 0a
-code size: 283
+code size: 280
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_scheduling_block_did_dirty.txt b/lang/tests/son_tests_scheduling_block_did_dirty.txt
index 34a3cfd7..386085c1 100644
--- a/lang/tests/son_tests_scheduling_block_did_dirty.txt
+++ b/lang/tests/son_tests_scheduling_block_did_dirty.txt
@@ -14,18 +14,18 @@ main:
     ADDI64 r254, r254, -32d
     ST r31, r254, 16a, 16h
     ADDI64 r32, r254, 0d
-    LI64 r3, 0d
+    CP r3, r0
     JAL r31, r0, :constructor
     ST r1, r254, 0a, 16h
     LD r31, r254, 16a, 16h
     ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
 opaque:
-    LRA r3, r0, :file
-    ADD64 r5, r3, r2
-    LD r7, r5, 0a, 1h
-    ANDI r1, r7, 255d
+    LRA r5, r0, :file
+    ADD64 r7, r5, r2
+    LD r9, r7, 0a, 1h
+    ANDI r1, r9, 255d
     JALA r0, r31, 0a
-code size: 274
+code size: 267
 ret: 255
 status: Ok(())
diff --git a/lang/tests/son_tests_small_struct_assignment.txt b/lang/tests/son_tests_small_struct_assignment.txt
index 27ddda15..94a589ce 100644
--- a/lang/tests/son_tests_small_struct_assignment.txt
+++ b/lang/tests/son_tests_small_struct_assignment.txt
@@ -1,10 +1,10 @@
 main:
     ADDI64 r254, r254, -4d
-    LRA r2, r0, :white
-    ADDI64 r3, r254, 0d
-    BMC r2, r3, 4h
-    LD r6, r254, 3a, 1h
-    ANDI r1, r6, 255d
+    LRA r4, r0, :white
+    ADDI64 r5, r254, 0d
+    BMC r4, r5, 4h
+    LD r8, r254, 3a, 1h
+    ANDI r1, r8, 255d
     ADDI64 r254, r254, 4d
     JALA r0, r31, 0a
 code size: 92
diff --git a/lang/tests/son_tests_sort_something_viredly.txt b/lang/tests/son_tests_sort_something_viredly.txt
index 536fb47a..1d59f8f8 100644
--- a/lang/tests/son_tests_sort_something_viredly.txt
+++ b/lang/tests/son_tests_sort_something_viredly.txt
@@ -7,23 +7,23 @@ main:
     ADDI64 r254, r254, 8d
     JALA r0, r31, 0a
 sqrt:
-    LI64 r7, 15d
-    LI64 r8, 32768d
-    LI64 r5, 0d
-    CP r1, r5
- 3: JNE r8, r5, :0
+    LI64 r9, 15d
+    LI64 r10, 32768d
+    CP r7, r0
+    CP r1, r7
+ 3: JNE r10, r7, :0
     JMP :1
- 0: SLUI64 r4, r1, 1b
-    ADDI64 r7, r7, -1d
-    ADD64 r9, r4, r8
-    SLU64 r9, r9, r7
-    JLTU r2, r9, :2
-    ADD64 r1, r8, r1
-    SUB64 r2, r2, r9
+ 0: SLUI64 r6, r1, 1b
+    ADDI64 r9, r9, -1d
+    ADD64 r11, r6, r10
+    SLU64 r11, r11, r9
+    JLTU r2, r11, :2
+    ADD64 r1, r10, r1
+    SUB64 r2, r2, r11
     JMP :2
- 2: SRUI64 r8, r8, 1b
+ 2: SRUI64 r10, r10, 1b
     JMP :3
  1: JALA r0, r31, 0a
-code size: 188
+code size: 181
 ret: 14
 status: Ok(())
diff --git a/lang/tests/son_tests_storing_into_nullable_struct.txt b/lang/tests/son_tests_storing_into_nullable_struct.txt
index d0cc4854..e521e2bd 100644
--- a/lang/tests/son_tests_storing_into_nullable_struct.txt
+++ b/lang/tests/son_tests_storing_into_nullable_struct.txt
@@ -4,66 +4,63 @@ do_stuff:
 just_read:
     JALA r0, r31, 0a
 main:
-    ADDI64 r254, r254, -120d
-    ST r31, r254, 48a, 72h
+    ADDI64 r254, r254, -104d
+    ST r31, r254, 48a, 56h
     ADDI64 r32, r254, 16d
     CP r1, r32
     JAL r31, r0, :optionala
     CP r2, r32
-    LI64 r33, 0d
-    LD r34, r254, 16a, 8h
-    JNE r34, r33, :0
+    LD r33, r254, 16a, 8h
+    JNE r33, r0, :0
     LI64 r1, 10d
     JMP :1
- 0: ST r33, r254, 24a, 8h
+ 0: ST r0, r254, 24a, 8h
     JAL r31, r0, :just_read
     LD r2, r254, 24a, 8h
     JAL r31, r0, :do_stuff
-    CP r35, r1
-    ADDI64 r36, r254, 0d
+    CP r34, r1
+    ADDI64 r35, r254, 0d
     JAL r31, r0, :optional
     ST r1, r254, 0a, 16h
-    LI8 r37, 0b
-    LD r38, r254, 0a, 1h
-    ANDI r38, r38, 255d
-    ANDI r37, r37, 255d
-    JNE r38, r37, :2
+    LD r36, r254, 0a, 1h
+    ANDI r36, r36, 255d
+    ANDI r0, r0, 255d
+    JNE r36, r0, :2
     LI64 r1, 20d
     JMP :1
- 2: LI64 r39, 100d
-    ST r39, r254, 8a, 8h
+ 2: LI64 r37, 100d
+    ST r37, r254, 8a, 8h
     LD r2, r254, 8a, 8h
     JAL r31, r0, :do_stuff
-    ADD64 r1, r1, r35
- 1: LD r31, r254, 48a, 72h
-    ADDI64 r254, r254, 120d
+    ADD64 r1, r1, r34
+ 1: LD r31, r254, 48a, 56h
+    ADDI64 r254, r254, 104d
     JALA r0, r31, 0a
 optional:
     ADDI64 r254, r254, -16d
-    LI8 r4, 1b
-    ADDI64 r3, r254, 0d
-    ST r4, r254, 0a, 1h
-    LI64 r4, 10d
-    ST r4, r254, 8a, 8h
-    LD r1, r3, 0a, 16h
+    LI8 r6, 1b
+    ADDI64 r5, r254, 0d
+    ST r6, r254, 0a, 1h
+    LI64 r6, 10d
+    ST r6, r254, 8a, 8h
+    LD r1, r5, 0a, 16h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 optionala:
     ADDI64 r254, r254, -48d
-    ADDI64 r5, r254, 8d
-    ADDI64 r4, r254, 16d
-    ST r5, r254, 16a, 8h
-    LI64 r9, 1d
-    ST r9, r254, 24a, 8h
-    ADDI64 r12, r254, 0d
-    ST r12, r254, 32a, 8h
-    LI64 r11, 0d
-    ST r11, r254, 0a, 8h
-    ST r11, r254, 8a, 8h
-    ST r11, r254, 40a, 8h
-    BMC r4, r1, 32h
+    ADDI64 r7, r254, 8d
+    ADDI64 r6, r254, 16d
+    ST r7, r254, 16a, 8h
+    LI64 r10, 1d
+    ST r10, r254, 24a, 8h
+    ADDI64 r2, r254, 0d
+    ST r2, r254, 32a, 8h
+    ST r0, r254, 0a, 8h
+    ST r0, r254, 8a, 8h
+    ST r0, r254, 40a, 8h
+    BMC r6, r1, 32h
     ADDI64 r254, r254, 48d
     JALA r0, r31, 0a
-code size: 603
+code size: 580
 ret: 100
 status: Ok(())
diff --git a/lang/tests/son_tests_string_flip.txt b/lang/tests/son_tests_string_flip.txt
index 33856d5b..76f68693 100644
--- a/lang/tests/son_tests_string_flip.txt
+++ b/lang/tests/son_tests_string_flip.txt
@@ -1,44 +1,44 @@
 main:
     ADDI64 r254, r254, -40d
-    LI64 r7, 1d
-    LI64 r6, 4d
-    LI64 r4, 0d
-    ADDI64 r5, r254, 0d
-    CP r8, r4
- 6: JNE r8, r6, :0
-    LI64 r6, 2d
-    ADDI64 r3, r254, 32d
-    CP r8, r4
+    LI64 r9, 1d
+    LI64 r8, 4d
+    CP r6, r0
+    ADDI64 r7, r254, 0d
+    CP r10, r6
+ 6: JNE r10, r8, :0
+    LI64 r8, 2d
+    ADDI64 r5, r254, 32d
+    CP r10, r6
  4: LD r1, r254, 16a, 8h
-    JNE r8, r7, :1
+    JNE r10, r9, :1
     JMP :2
- 1: MUL64 r12, r8, r6
-    ADD64 r8, r8, r7
-    SUB64 r9, r6, r8
-    MUL64 r9, r9, r6
-    CP r11, r4
- 5: JNE r11, r6, :3
+ 1: MUL64 r2, r10, r8
+    ADD64 r10, r10, r9
+    SUB64 r11, r8, r10
+    MUL64 r11, r11, r8
+    CP r1, r6
+ 5: JNE r1, r8, :3
     JMP :4
- 3: ADD64 r10, r11, r7
-    ADD64 r1, r12, r11
-    ADD64 r2, r9, r11
-    MULI64 r1, r1, 8d
-    MULI64 r11, r2, 8d
-    ADD64 r1, r5, r1
-    ADD64 r11, r5, r11
+ 3: ADD64 r12, r1, r9
+    ADD64 r3, r2, r1
+    ADD64 r4, r11, r1
+    MULI64 r3, r3, 8d
+    MULI64 r1, r4, 8d
+    ADD64 r3, r7, r3
+    ADD64 r1, r7, r1
+    BMC r3, r5, 8h
     BMC r1, r3, 8h
-    BMC r11, r1, 8h
-    BMC r3, r11, 8h
-    CP r11, r10
+    BMC r5, r1, 8h
+    CP r1, r12
     JMP :5
- 0: ADD64 r2, r8, r7
-    MULI64 r12, r8, 8d
-    ADD64 r3, r5, r12
-    ST r8, r3, 0a, 8h
-    CP r8, r2
+ 0: ADD64 r4, r10, r9
+    MULI64 r2, r10, 8d
+    ADD64 r5, r7, r2
+    ST r10, r5, 0a, 8h
+    CP r10, r4
     JMP :6
  2: ADDI64 r254, r254, 40d
     JALA r0, r31, 0a
-code size: 271
+code size: 264
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_struct_in_register.txt b/lang/tests/son_tests_struct_in_register.txt
index 511ff151..0759470e 100644
--- a/lang/tests/son_tests_struct_in_register.txt
+++ b/lang/tests/son_tests_struct_in_register.txt
@@ -1,10 +1,10 @@
 main:
     ADDI64 r254, r254, -4d
-    LRA r1, r0, :MAGENTA
-    ADDI64 r3, r254, 0d
-    BMC r1, r3, 4h
-    LD r6, r254, 2a, 1h
-    ANDI r1, r6, 255d
+    LRA r3, r0, :MAGENTA
+    ADDI64 r5, r254, 0d
+    BMC r3, r5, 4h
+    LD r8, r254, 2a, 1h
+    ANDI r1, r8, 255d
     ADDI64 r254, r254, 4d
     JALA r0, r31, 0a
 code size: 92
diff --git a/lang/tests/son_tests_struct_patterns.txt b/lang/tests/son_tests_struct_patterns.txt
index 28b22bb2..0a96a214 100644
--- a/lang/tests/son_tests_struct_patterns.txt
+++ b/lang/tests/son_tests_struct_patterns.txt
@@ -18,17 +18,16 @@ fib:
     ADDI64 r254, r254, 32d
     JALA r0, r31, 0a
 fib_iter:
-    LI64 r4, 1d
-    LI64 r5, 0d
-    CP r1, r5
-    CP r10, r4
- 2: JNE r2, r5, :0
+    LI64 r6, 1d
+    CP r7, r0
+    CP r1, r7
+    CP r12, r6
+ 2: JNE r2, r7, :0
     JMP :1
- 0: ADD64 r1, r10, r1
-    SUB64 r2, r2, r4
-    CP r3, r1
-    CP r1, r10
-    CP r10, r3
+ 0: ADD64 r3, r12, r1
+    SUB64 r2, r2, r6
+    CP r1, r12
+    CP r12, r3
     JMP :2
  1: JALA r0, r31, 0a
 main:
@@ -44,6 +43,6 @@ main:
     LD r31, r254, 0a, 24h
     ADDI64 r254, r254, 24d
     JALA r0, r31, 0a
-code size: 300
+code size: 290
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_struct_return_from_module_function.txt b/lang/tests/son_tests_struct_return_from_module_function.txt
index c17dbb3b..1fa54faf 100644
--- a/lang/tests/son_tests_struct_return_from_module_function.txt
+++ b/lang/tests/son_tests_struct_return_from_module_function.txt
@@ -1,12 +1,12 @@
 foo:
     ADDI64 r254, r254, -16d
-    LI64 r3, 3d
-    ADDI64 r2, r254, 0d
-    ST r3, r254, 0a, 8h
-    LI32 r6, 2w
-    ST r6, r254, 8a, 4h
-    ST r6, r254, 12a, 4h
-    LD r1, r2, 0a, 16h
+    LI64 r5, 3d
+    ADDI64 r4, r254, 0d
+    ST r5, r254, 0a, 8h
+    LI32 r8, 2w
+    ST r8, r254, 8a, 4h
+    ST r8, r254, 12a, 4h
+    LD r1, r4, 0a, 16h
     ADDI64 r254, r254, 16d
     JALA r0, r31, 0a
 main:
diff --git a/lang/tests/son_tests_structs.txt b/lang/tests/son_tests_structs.txt
index 7a590a33..de32c6eb 100644
--- a/lang/tests/son_tests_structs.txt
+++ b/lang/tests/son_tests_structs.txt
@@ -16,7 +16,7 @@ main:
     CP r2, r34
     JAL r31, r0, :pass
     JMP :1
- 0: LI64 r1, 0d
+ 0: CP r1, r0
  1: LD r31, r254, 32a, 40h
     ADDI64 r254, r254, 72d
     JALA r0, r31, 0a
@@ -30,6 +30,6 @@ odher_pass:
 pass:
     LD r1, r2, 0a, 8h
     JALA r0, r31, 0a
-code size: 308
+code size: 301
 ret: 4
 status: Ok(())
diff --git a/lang/tests/son_tests_tests_ptr_to_ptr_copy.txt b/lang/tests/son_tests_tests_ptr_to_ptr_copy.txt
index 6a10f2f6..ce18be5f 100644
--- a/lang/tests/son_tests_tests_ptr_to_ptr_copy.txt
+++ b/lang/tests/son_tests_tests_ptr_to_ptr_copy.txt
@@ -1,30 +1,30 @@
 main:
     ADDI64 r254, r254, -10240d
-    LI64 r7, 1d
-    LI8 r8, 64b
-    LI64 r6, 1024d
-    LI64 r9, 0d
-    ADDI64 r5, r254, 0d
- 4: JLTU r9, r6, :0
-    LI64 r6, 10d
-    CP r8, r7
- 3: LD r11, r254, 2048a, 1h
-    JLTU r8, r6, :1
-    ANDI r1, r11, 255d
+    LI64 r9, 1d
+    LI8 r10, 64b
+    LI64 r8, 1024d
+    CP r11, r0
+    ADDI64 r7, r254, 0d
+ 4: JLTU r11, r8, :0
+    LI64 r8, 10d
+    CP r10, r9
+ 3: LD r1, r254, 2048a, 1h
+    JLTU r10, r8, :1
+    ANDI r1, r1, 255d
     JMP :2
- 1: ADD64 r2, r8, r7
-    MULI64 r1, r8, 1024d
-    ADD64 r3, r5, r1
-    BMC r5, r3, 1024h
-    CP r8, r2
+ 1: ADD64 r4, r10, r9
+    MULI64 r3, r10, 1024d
+    ADD64 r5, r7, r3
+    BMC r7, r5, 1024h
+    CP r10, r4
     JMP :3
- 0: ADD64 r2, r9, r7
-    ADD64 r12, r5, r9
-    ST r8, r12, 0a, 1h
-    CP r9, r2
+ 0: ADD64 r4, r11, r9
+    ADD64 r2, r7, r11
+    ST r10, r2, 0a, 1h
+    CP r11, r4
     JMP :4
  2: ADDI64 r254, r254, 10240d
     JALA r0, r31, 0a
-code size: 198
+code size: 191
 ret: 64
 status: Ok(())
diff --git a/lang/tests/son_tests_triggering_store_in_divergent_branch.txt b/lang/tests/son_tests_triggering_store_in_divergent_branch.txt
index 28f60765..538df1b3 100644
--- a/lang/tests/son_tests_triggering_store_in_divergent_branch.txt
+++ b/lang/tests/son_tests_triggering_store_in_divergent_branch.txt
@@ -1,10 +1,10 @@
 main:
     ADDI64 r254, r254, -72d
     ST r31, r254, 0a, 72h
-    LI8 r32, 0b
+    CP r32, r0
     LI64 r33, 65536d
     LI8 r34, 1b
-    LI64 r35, 0d
+    CP r35, r0
     CP r36, r35
  7: JAL r31, r0, :opaque
     JLTU r36, r1, :0
@@ -30,6 +30,6 @@ opaque:
     LI64 r1, 2147483648d
     JALA r0, r31, 0a
 timed out
-code size: 218
+code size: 211
 ret: 2147483648
 status: Ok(())
diff --git a/lang/tests/son_tests_variables.txt b/lang/tests/son_tests_variables.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_variables.txt
+++ b/lang/tests/son_tests_variables.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_very_nested_loops.txt b/lang/tests/son_tests_very_nested_loops.txt
index e10b4213..5aa16aa1 100644
--- a/lang/tests/son_tests_very_nested_loops.txt
+++ b/lang/tests/son_tests_very_nested_loops.txt
@@ -1,6 +1,6 @@
 main:
-    LI64 r1, 0d
+    CP r1, r0
     JALA r0, r31, 0a
-code size: 29
+code size: 22
 ret: 0
 status: Ok(())
diff --git a/lang/tests/son_tests_wide_ret.txt b/lang/tests/son_tests_wide_ret.txt
index 2d01e043..ff6a7c23 100644
--- a/lang/tests/son_tests_wide_ret.txt
+++ b/lang/tests/son_tests_wide_ret.txt
@@ -2,7 +2,7 @@ main:
     ADDI64 r254, r254, -56d
     ST r31, r254, 16a, 40h
     ADDI64 r32, r254, 0d
-    LI64 r4, 0d
+    CP r4, r0
     CP r3, r4
     JAL r31, r0, :maina
     ST r1, r254, 0a, 16h
@@ -14,44 +14,42 @@ main:
     ADDI64 r254, r254, 56d
     JALA r0, r31, 0a
 maina:
-    ADDI64 r254, r254, -68d
-    ST r31, r254, 20a, 48h
+    ADDI64 r254, r254, -60d
+    ST r31, r254, 20a, 40h
     ADDI64 r32, r254, 16d
     JAL r31, r0, :small_struct
     ST r1, r254, 16a, 4h
-    LI8 r33, 0b
-    ADDI64 r34, r254, 0d
-    ST r33, r254, 0a, 1h
-    ST r33, r254, 1a, 1h
-    ST r33, r254, 2a, 1h
-    LI8 r35, 3b
-    ST r35, r254, 3a, 1h
-    LI8 r36, 1b
-    ST r36, r254, 4a, 1h
-    ST r33, r254, 5a, 1h
-    ST r33, r254, 6a, 1h
-    ST r33, r254, 7a, 1h
-    ST r33, r254, 8a, 1h
-    ST r33, r254, 9a, 1h
-    ST r33, r254, 10a, 1h
-    ST r35, r254, 11a, 1h
-    ST r36, r254, 12a, 1h
-    ST r33, r254, 13a, 1h
-    ST r33, r254, 14a, 1h
-    ST r33, r254, 15a, 1h
-    LD r1, r34, 0a, 16h
-    LD r31, r254, 20a, 48h
-    ADDI64 r254, r254, 68d
+    ADDI64 r33, r254, 0d
+    ST r0, r254, 0a, 1h
+    ST r0, r254, 1a, 1h
+    ST r0, r254, 2a, 1h
+    LI8 r34, 3b
+    ST r34, r254, 3a, 1h
+    LI8 r35, 1b
+    ST r35, r254, 4a, 1h
+    ST r0, r254, 5a, 1h
+    ST r0, r254, 6a, 1h
+    ST r0, r254, 7a, 1h
+    ST r0, r254, 8a, 1h
+    ST r0, r254, 9a, 1h
+    ST r0, r254, 10a, 1h
+    ST r34, r254, 11a, 1h
+    ST r35, r254, 12a, 1h
+    ST r0, r254, 13a, 1h
+    ST r0, r254, 14a, 1h
+    ST r0, r254, 15a, 1h
+    LD r1, r33, 0a, 16h
+    LD r31, r254, 20a, 40h
+    ADDI64 r254, r254, 60d
     JALA r0, r31, 0a
 small_struct:
     ADDI64 r254, r254, -4d
-    LI16 r2, 0h
     ADDI64 r3, r254, 0d
-    ST r2, r254, 0a, 2h
-    ST r2, r254, 2a, 2h
+    ST r0, r254, 0a, 2h
+    ST r0, r254, 2a, 2h
     LD r1, r3, 0a, 4h
     ADDI64 r254, r254, 4d
     JALA r0, r31, 0a
-code size: 570
+code size: 556
 ret: 2
 status: Ok(())
diff --git a/lang/tests/son_tests_wrong_dead_code_elimination.txt b/lang/tests/son_tests_wrong_dead_code_elimination.txt
index 7bce152b..f028305f 100644
--- a/lang/tests/son_tests_wrong_dead_code_elimination.txt
+++ b/lang/tests/son_tests_wrong_dead_code_elimination.txt
@@ -1,29 +1,27 @@
 main:
     ADDI64 r254, r254, -1d
-    LI64 r7, 0d
     LI64 r6, 255d
-    LI8 r2, 1b
-    LI8 r4, 0b
-    ST r4, r254, 0a, 1h
- 2: LD r9, r254, 0a, 1h
-    ANDI r11, r9, 255d
-    CMPU r3, r11, r6
+    LI8 r1, 1b
+    ST r0, r254, 0a, 1h
+ 2: LD r8, r254, 0a, 1h
+    ANDI r10, r8, 255d
+    CMPU r2, r10, r6
+    CMPUI r2, r2, 0d
+    NOT r2, r2
+    CMPU r3, r10, r0
     CMPUI r3, r3, 0d
     NOT r3, r3
-    CMPU r5, r11, r7
-    CMPUI r5, r5, 0d
-    NOT r5, r5
-    OR r8, r5, r3
-    ANDI r8, r8, 255d
-    JNE r8, r0, :0
+    OR r5, r3, r2
+    ANDI r5, r5, 255d
+    JNE r5, r0, :0
     JMP :1
- 0: SUB8 r2, r0, r2
- 1: ADD8 r4, r9, r2
-    ST r4, r254, 0a, 1h
+ 0: SUB8 r1, r0, r1
+ 1: ADD8 r2, r8, r1
+    ST r2, r254, 0a, 1h
     JMP :2
     ADDI64 r254, r254, 1d
     JALA r0, r31, 0a
 timed out
-code size: 191
-ret: 0
+code size: 178
+ret: 1
 status: Ok(())