1 files changed, 1 insertions, 0 deletions

diff --git a/src/lj_asm.c b/src/lj_asm.c
index 426730be..8deddd65 100644
--- a/src/lj_asm.c
+++ b/src/lj_asm.c
@@ -644,6 +644,7 @@ static void ra_destreg(ASMState *as, IRIns *ir, Reg r)
 {
   Reg dest = ra_dest(as, ir, RID2RSET(r));
   if (dest != r) {
+    lua_assert(rset_test(as->freeset, r));
     ra_modified(as, r);
     emit_movrr(as, ir, dest, r);
   }