From 69df01efb20fb7bd91f9a857c78da8d49a01e309 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 28 Mar 2010 03:34:18 +0200
Subject: Fix precondition check for NEWREF.

A check for nil value is not enough. Must check for ptr == niltv.
---
 src/lj_record.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/lj_record.c b/src/lj_record.c
index 54068697..29c024bf 100644
--- a/src/lj_record.c
+++ b/src/lj_record.c
@@ -995,10 +995,10 @@ static TRef rec_idx(jit_State *J, RecordIndex *ix)
 	cTValue *mo = lj_tab_getstr(mt, strref(J2G(J)->mmname[MM_newindex]));
 	hasmm = mo && !tvisnil(mo);
       }
-      if (hasmm || oldv == niltvg(J2G(J)))
+      if (hasmm)
 	emitir(IRTG(loadop, IRT_NIL), xref, 0);  /* Guard for nil value. */
       else if (xrefop == IR_HREF)
-	emitir(IRTG(IR_NE, IRT_PTR), xref, lj_ir_kptr(J, niltvg(J2G(J))));
+	emitir(IRTG(oldv == niltvg(J2G(J)) ? IR_EQ : IR_NE, IRT_PTR), xref, lj_ir_kptr(J, niltvg(J2G(J))));
       if (ix->idxchain && rec_mm_lookup(J, ix, MM_newindex)) { /* Metamethod? */
 	lua_assert(hasmm);
 	goto handlemm;
-- 
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