Fix data-flow analysis for BC_ITERC.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/lj_snap.c b/src/lj_snap.c
index 70628a0e..c044923a 100644
--- a/src/lj_snap.c
+++ b/src/lj_snap.c
@@ -217,7 +217,8 @@ static BCReg snap_usedef(jit_State *J, uint8_t *udf,
       if (op >= BC_CALLM && op <= BC_VARG) {
         BCReg top = (op == BC_CALLM || op == BC_CALLMT || bc_c(ins) == 0) ?
                     maxslot : (bc_a(ins) + bc_c(ins));
-        for (s = bc_a(ins); s < top; s++) USE_SLOT(s);
+        s = bc_a(ins) - ((op == BC_ITERC || op == BC_ITERN) ? 3 : 0);
+        for (; s < top; s++) USE_SLOT(s);
         for (; s < maxslot; s++) DEF_SLOT(s);
         if (op == BC_CALLT || op == BC_CALLMT) {
           for (s = 0; s < bc_a(ins); s++) DEF_SLOT(s);