1 files changed, 18 insertions, 0 deletions
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 802305ff01..772850a728 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1371,6 +1371,24 @@ rb_vm_setinstancevariable(const rb_iseq_t *iseq, VALUE obj, ID id, VALUE val, IV
     vm_setinstancevariable(iseq, obj, id, val, ic);
 }
 
+VALUE
+rb_vm_set_ivar_idx(VALUE obj, uint32_t index, VALUE val)
+{
+    RUBY_ASSERT(RB_TYPE_P(obj, T_OBJECT));
+
+    rb_check_frozen_internal(obj);
+
+    VM_ASSERT(!rb_ractor_shareable_p(obj));
+
+    if (UNLIKELY(index >= ROBJECT_NUMIV(obj))) {
+        rb_init_iv_list(obj);
+    }
+    VALUE *ptr = ROBJECT_IVPTR(obj);
+    RB_OBJ_WRITE(obj, &ptr[index], val);
+    RB_DEBUG_COUNTER_INC(ivar_set_ic_hit);
+    return val; /* inline cache hit */
+}
+
 static VALUE
 vm_throw_continue(const rb_execution_context_t *ec, VALUE err)
 {