From 18534a64a6d36571d402f6c6bf0bbdb8bad4c37a Mon Sep 17 00:00:00 2001
From: Jonny <j.sinteix@gmail.com>
Date: Wed, 26 Feb 2025 21:39:23 +0000
Subject: [PATCH] feat: Zero registers via XOR

---
 src/main/wacc/backend/asmGenerator.scala | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/main/wacc/backend/asmGenerator.scala b/src/main/wacc/backend/asmGenerator.scala
index 0e0643e..54fc7db 100644
--- a/src/main/wacc/backend/asmGenerator.scala
+++ b/src/main/wacc/backend/asmGenerator.scala
@@ -73,7 +73,7 @@ object asmGenerator {
       funcPrologue(),
       Chain.one(stack.align()),
       main.foldMap(generateStmt(_)),
-      Chain.one(Move(RAX, ImmediateVal(0))),
+      Chain.one(Xor(RAX, RAX)),
       funcEpilogue(),
       generateBuiltInFuncs(),
       funcs.foldMap(generateUserFunc(_))
@@ -143,7 +143,7 @@ object asmGenerator {
       Chain(
         stack.align(),
         assemblyIR.Call(CLibFunc.PrintF),
-        Move(RDI, ImmediateVal(0)),
+        Xor(RDI, RDI),
         assemblyIR.Call(CLibFunc.Fflush)
       )
     )
@@ -293,7 +293,10 @@ object asmGenerator {
           case _ => // Other array types TODO
         }
 
-      case BoolLiter(v)    => chain += stack.push(ImmediateVal(if (v) 1 else 0))
+      case BoolLiter(true) => chain += stack.push(ImmediateVal(1))
+      case BoolLiter(false) =>
+        chain += Xor(RAX, RAX)
+        chain += stack.push(RAX)
       case NullLiter()     => chain += stack.push(ImmediateVal(0))
       case ArrayElem(_, _) => // TODO: Implement handling
       case UnaryOp(x, op) =>