From e4bca9545186ffd6b9ee03f711adfa495d55c0fc Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 28 Mar 2010 06:49:09 +0200
Subject: Generate EQ(HREF, niltv) for load path, too (better CSE).

---
 src/lj_record.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/lj_record.c b/src/lj_record.c
index 29c024bf..e89d9c26 100644
--- a/src/lj_record.c
+++ b/src/lj_record.c
@@ -981,7 +981,13 @@ static TRef rec_idx(jit_State *J, RecordIndex *ix)
 
   if (ix->val == 0) {  /* Indexed load */
     IRType t = itype2irt(oldv);
-    TRef res = emitir(IRTG(loadop, t), xref, 0);
+    TRef res;
+    if (oldv == niltvg(J2G(J))) {
+      emitir(IRTG(IR_EQ, IRT_PTR), xref, lj_ir_kptr(J, niltvg(J2G(J))));
+      res = TREF_NIL;
+    } else {
+      res = emitir(IRTG(loadop, t), xref, 0);
+    }
     if (t == IRT_NIL && ix->idxchain && rec_mm_lookup(J, ix, MM_index))
       goto handlemm;
     if (irtype_ispri(t)) res = TREF_PRI(t);  /* Canonicalize primitives. */
-- 
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