From 704280fb80d5320b20f6cd20cfbf009a999164f0 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Wed, 18 Feb 2015 16:00:15 +0100
Subject: [PATCH] FFI: Prevent DSE across ffi.string().

---
 src/lj_opt_mem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lj_opt_mem.c b/src/lj_opt_mem.c
index f4e3cd3a..a4d96fc0 100644
--- a/src/lj_opt_mem.c
+++ b/src/lj_opt_mem.c
@@ -793,6 +793,7 @@ TRef LJ_FASTCALL lj_opt_dse_xstore(jit_State *J)
   IRRef ref = *refp;
   if (J->chain[IR_CALLXS] > lim) lim = J->chain[IR_CALLXS];
   if (J->chain[IR_XBAR] > lim) lim = J->chain[IR_XBAR];
+  if (J->chain[IR_XSNEW] > lim) lim = J->chain[IR_XSNEW];
   while (ref > lim) {  /* Search for redundant or conflicting stores. */
     IRIns *store = IR(ref);
     switch (aa_xref(J, xr, fins, store)) {