Fix FOLD rule for x-0.

Reported by XmiliaH.

diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c
index e5929442d16203ba33025d171fce4b3fa2b014ca..b9efb0a1051027e9a747d0048de3fa55ce57aeed 100644 (file)
--- 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;
 }