From fefb5114046fcc33e18843317f7395f859a389a1 Mon Sep 17 00:00:00 2001
From: drmortalwombat <90205530+drmortalwombat@users.noreply.github.com>
Date: Sat, 15 Mar 2025 17:59:45 +0100
Subject: [PATCH] Fix integer range loss in loop index reduction

---
 oscar64/InterCode.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/oscar64/InterCode.cpp b/oscar64/InterCode.cpp
index 5b915b0..cc93328 100644
--- a/oscar64/InterCode.cpp
+++ b/oscar64/InterCode.cpp
@@ -15915,6 +15915,11 @@ bool InterCodeBasicBlock::SingleTailLoopOptimization(const NumberSet& aliasedPar
 									ains->mSrc[0].mIntConst = s;
 									tail->AppendBeforeBranch(ains);
 
+									if (s > 0)
+										ains->mDst.mRange.mMaxValue += s;
+									else
+										ains->mDst.mRange.mMinValue += s;
+
 									indexScale[ains->mDst.mTemp] = s;
 
 									modified = true;