From 5ed524c09fec64bed46b4bf74fa03be9083b0963 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sat, 1 Aug 2026 19:39:35 +0200
Subject: Don't fold -a / -b for unsigned operands.

Thanks to Peter Marreck and Peter Cawley. #1499
---
 src/lj_opt_fold.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src')

diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c
index 03d869d00..3738f3570 100644
--- a/src/lj_opt_fold.c
+++ b/src/lj_opt_fold.c
@@ -867,6 +867,8 @@ LJFOLD(MUL NEG NEG)
 LJFOLD(DIV NEG NEG)
 LJFOLDF(simplify_nummuldiv_negneg)
 {
+  if (fins->o == IR_DIV && (irt_isu32(fins->t) || irt_isu64(fins->t)))
+    return NEXTFOLD;
   PHIBARRIER(fleft);
   PHIBARRIER(fright);
   fins->op1 = fleft->op1;  /* (-a) o (-b) ==> a o b */
-- 
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