From 41f76e50e0c4561355dbb40f40fa6ac02cdc3149 Mon Sep 17 00:00:00 2001
From: Gleb Koval <gleb@koval.net>
Date: Fri, 28 Feb 2025 00:27:26 +0000
Subject: [PATCH] fix: evaluate all function call arguments before setting
 registers

---
 src/main/wacc/backend/asmGenerator.scala | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/main/wacc/backend/asmGenerator.scala b/src/main/wacc/backend/asmGenerator.scala
index 60e0b47..249d109 100644
--- a/src/main/wacc/backend/asmGenerator.scala
+++ b/src/main/wacc/backend/asmGenerator.scala
@@ -392,10 +392,16 @@ object asmGenerator {
     var chain = Chain.empty[AsmLine]
     val microWacc.Call(target, args) = call
 
-    argRegs.zip(args).foldMap { (reg, expr) =>
-      chain ++= evalExprOntoStack(expr)
-      chain += stack.pop(Register(Q64, reg))
-    }
+    argRegs
+      .zip(args)
+      .map { (reg, expr) =>
+        chain ++= evalExprOntoStack(expr)
+        reg
+      }
+      .reverse
+      .foreach { reg =>
+        chain += stack.pop(Register(Q64, reg))
+      }
 
     args.drop(argRegs.size).foldMap {
       chain ++= evalExprOntoStack(_)