From dfdc4b5f83deb595cfb19d2ea5a48b764d3acd6a Mon Sep 17 00:00:00 2001
From: Tobiasz Laskowski <tobil4sk@outlook.com>
Date: Wed, 17 Sep 2025 12:55:54 +0100
Subject: [PATCH 1/2] [cppia] Fix int overflow in arithmetic assignments

Currently, the cppia interp runtime uses float operations for arithmetic
assignments such as *=. This results in inconsistent int overflow
behaviour.
---
 src/hx/cppia/Cppia.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/hx/cppia/Cppia.h b/src/hx/cppia/Cppia.h
index b8361537c..0137f2937 100644
--- a/src/hx/cppia/Cppia.h
+++ b/src/hx/cppia/Cppia.h
@@ -1083,6 +1083,14 @@ struct NAME \
       ioVal  = left OP f; \
       return ioVal; \
    } \
+   inline static int &run(int &ioVal, hx::CppiaCtx *ctx, hx::CppiaExpr *value) \
+   { \
+      int left = ioVal; \
+      int i = value->runInt(ctx); \
+      BCR_CHECK_RET(ioVal); \
+      ioVal  = left OP i; \
+      return ioVal; \
+   } \
    static bool run(bool &ioVal, hx::CppiaCtx *ctx, hx::CppiaExpr *value) { value->runVoid(ctx); return ioVal; } \
    static String run(String &ioVal, hx::CppiaCtx *ctx, hx::CppiaExpr *value) { value->runVoid(ctx); return ioVal; } \
    static hx::Object *run(hx::Object * &ioVal, hx::CppiaCtx *ctx, hx::CppiaExpr *value) \

From 31cde08326221f4ae8692e49d72ab9a7c014845a Mon Sep 17 00:00:00 2001
From: Tobiasz Laskowski <tobil4sk@outlook.com>
Date: Wed, 17 Sep 2025 12:56:25 +0100
Subject: [PATCH 2/2] [tests] Add regression test for int *= overflow

---
 test/cppia/Client.hx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/cppia/Client.hx b/test/cppia/Client.hx
index 67842a75a..391945db2 100644
--- a/test/cppia/Client.hx
+++ b/test/cppia/Client.hx
@@ -189,6 +189,14 @@ class Client
          default:
       }
 
+      // regression test for #1257
+      var x = 1290555;
+      x *= 1290555;
+      if (x != -915102823) {
+         Common.status = 'Failed regression test for #1257. x: $x';
+         return;
+      }
+
       final extending = new ClientExtendedExtendedRoot();
 
       extending.addValue();