From 32c1d4751a302dc7838659477fe8605e3c14eabb Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Fri, 26 Aug 2011 20:29:05 +0200
Subject: [PATCH] Avoid conversion narrowing of arithmetic with large
 constants.

---
 src/lj_opt_narrow.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lj_opt_narrow.c b/src/lj_opt_narrow.c
index 37fda0b6..d9d1e2ba 100644
--- a/src/lj_opt_narrow.c
+++ b/src/lj_opt_narrow.c
@@ -284,7 +284,8 @@ static int narrow_conv_backprop(NarrowConv *nc, IRRef ref, int depth)
       }
     } else {
       int32_t k = lj_num2int(n);
-      if (n == (lua_Number)k) {  /* Only if constant is really an integer. */
+      /* Only if constant is a small integer. */
+      if (checki16(k) && n == (lua_Number)k) {
 	*nc->sp++ = NARROWINS(NARROW_INT, 0);
 	*nc->sp++ = (NarrowIns)k;
 	return 0;