From 55dbf8ee32d64f26b1ba533e58189808359be1f6 Mon Sep 17 00:00:00 2001
From: Rerumu <rerumu@protonmail.com>
Date: Wed, 17 Nov 2021 01:28:57 -0500
Subject: [PATCH] Implement loading i8

---
 runtime/luajit.lua | 2 ++
 runtime/luau.lua   | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/runtime/luajit.lua b/runtime/luajit.lua
index 13a9b7d..38ca2c5 100644
--- a/runtime/luajit.lua
+++ b/runtime/luajit.lua
@@ -7,6 +7,7 @@ local module = {}
 
 local vla_u8 = ffi.typeof('uint8_t[?]')
 
+local ptr_i8 = ffi.typeof('int8_t *')
 local ptr_i64 = ffi.typeof('int64_t *')
 local ptr_i32 = ffi.typeof('int32_t *')
 
@@ -105,6 +106,7 @@ do
 	module.load = load
 	module.store = store
 
+	function load.i32_i8(memory, addr) return ffi.cast(ptr_i8, memory.data)[addr] end
 	function load.i32_u8(memory, addr) return memory.data[addr] end
 	function load.i32(memory, addr) return ffi.cast(ptr_i32, memory.data + addr)[0] end
 	function load.i64(memory, addr) return ffi.cast(ptr_i64, memory.data + addr)[0] end
diff --git a/runtime/luau.lua b/runtime/luau.lua
index 8376054..296e470 100644
--- a/runtime/luau.lua
+++ b/runtime/luau.lua
@@ -130,6 +130,14 @@ do
 		memory.data[adjust] = bit32.bor(lhs, rhs)
 	end
 
+	function load.i32_i8(memory, addr)
+		local b = load_byte(memory, addr)
+
+		if b > 0x7F then b = b - 0x100 end
+
+		return b
+	end
+
 	load.i32_u8 = load_byte
 
 	function load.i32(memory, addr)