From 9f0caad0e43f97a4613850b3874b851cb1bc301d Mon Sep 17 00:00:00 2001

From: Mike Pall <mike>

Date: Wed, 8 Nov 2017 12:53:05 +0100

Subject: [PATCH 19/72] Fix FOLD rule for strength reduction of widening.

Reported by Matthew Burk.

---

 src/lj_opt_fold.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lj_opt_fold.c b/src/lj_opt_fold.c

index 3d0e35a..5dc7ae3 100644

--- a/src/lj_opt_fold.c

+++ b/src/lj_opt_fold.c

@@ -1052,7 +1052,7 @@ LJFOLDF(simplify_conv_sext)

   if (ref == J->scev.idx) {

     IRRef lo = J->scev.dir ? J->scev.start : J->scev.stop;

     lua_assert(irt_isint(J->scev.t));

-    if (lo && IR(lo)->i + ofs >= 0) {

+    if (lo && IR(lo)->o == IR_KINT && IR(lo)->i + ofs >= 0) {

     ok_reduce:

 #if LJ_TARGET_X64

       /* Eliminate widening. All 32 bit ops do an implicit zero-extension. */

-- 

2.20.1