From 10a9f29b089eae48467c850dadaf7b45cae9838a Mon Sep 17 00:00:00 2001
From: ike709 <ike709@github.com>
Date: Mon, 9 Dec 2024 22:23:41 -0600
Subject: [PATCH] Fix off-by-one in peephole optimizer

---
 DMCompiler/Optimizer/PeepholeOptimizer.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/DMCompiler/Optimizer/PeepholeOptimizer.cs b/DMCompiler/Optimizer/PeepholeOptimizer.cs
index aad7cd7287..4da09e52fb 100644
--- a/DMCompiler/Optimizer/PeepholeOptimizer.cs
+++ b/DMCompiler/Optimizer/PeepholeOptimizer.cs
@@ -141,7 +141,7 @@ int AttemptCurrentOpt(int i) {
             var bytecode = input[i];
             if (bytecode is not AnnotatedBytecodeInstruction instruction) {
                 i -= AttemptCurrentOpt(i);
-                i = Math.Max(i, 0);
+                i = Math.Max(i, -1); // i++ brings -1 back to 0
                 continue;
             }
 
@@ -160,7 +160,7 @@ int AttemptCurrentOpt(int i) {
             }
 
             i -= AttemptCurrentOpt(i);
-            i = Math.Max(i, 0);
+            i = Math.Max(i, -1); // i++ brings -1 back to 0
         }
 
         AttemptCurrentOpt(input.Count);