From 7b994e0ee0399caf6319865bbac88ddf62129a36 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Fri, 17 Dec 2021 14:15:40 +0100
Subject: Fix FOLD rule for x-0.

Reported by XmiliaH.
---
 src/lj_opt_fold.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c
index e5929442..b9efb0a1 100644
--- a/src/lj_opt_fold.c
+++ b/src/lj_opt_fold.c
@@ -805,8 +805,7 @@ LJFOLDF(simplify_numadd_xneg)
 LJFOLD(SUB any KNUM)
 LJFOLDF(simplify_numsub_k)
 {
-  lua_Number n = knumright;
-  if (n == 0.0)  /* x - (+-0) ==> x */
+  if (ir_knum(fright)->u64 == 0)  /* x - (+0) ==> x */
     return LEFTFOLD;
   return NEXTFOLD;
 }
-- 
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