From c00c9b397e03ec967019c3af42ca17ee44386c37 Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Sun, 25 Feb 2024 23:46:06 -0800
Subject: [PATCH] Adds a unittest for a bug from #3421

When the source arguments for LoadMem/StoreMem have bit 31 set then they
are incorrectly sign extending in some instances.

Detected this when testing #3421 but I don't have a proper fix for it.
---
 .../32Bit_ASM/FEX_bugs/SignExtendBug.asm      | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 unittests/32Bit_ASM/FEX_bugs/SignExtendBug.asm

diff --git a/unittests/32Bit_ASM/FEX_bugs/SignExtendBug.asm b/unittests/32Bit_ASM/FEX_bugs/SignExtendBug.asm
new file mode 100644
index 000000000..ea564e23e
--- /dev/null
+++ b/unittests/32Bit_ASM/FEX_bugs/SignExtendBug.asm
@@ -0,0 +1,20 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x41424344"
+  },
+  "MemoryRegions": {
+    "0xf0000000": "4096"
+  },
+  "MemoryData": {
+    "0xf0000000": "0x41424344"
+  },
+  "Mode": "32BIT"
+}
+%endif
+
+; Ensures that zero extension of addresses are adhered to.
+lea eax, [0xf000_0000]
+mov eax, [ds:eax]
+
+hlt