diff --git a/benchmark/vm_cvar.yml b/benchmark/vm_cvar.yml
deleted file mode 100644
index 1d0e161829..0000000000
--- a/benchmark/vm_cvar.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-prelude: |
-  class A
-    @@foo = 1
-
-    def self.foo
-      @@foo
-    end
-
-    ("A".."Z").each do |module_name|
-      eval <<-EOM
-        module #{module_name}
-        end
-
-        include #{module_name}
-      EOM
-    end
-  end
-benchmark:
-  vm_cvar: A.foo
-loop_count: 600000
diff --git a/class.c b/class.c
index ef3db6dab3..9ac2b3ff47 100644
--- a/class.c
+++ b/class.c
@@ -27,7 +27,6 @@
 #include <ctype.h>
 
 #include "constant.h"
-#include "debug_counter.h"
 #include "id_table.h"
 #include "internal.h"
 #include "internal/class.h"
@@ -44,8 +43,6 @@
 #define METACLASS_OF(k) RBASIC(k)->klass
 #define SET_METACLASS_OF(k, cls) RBASIC_SET_CLASS(k, cls)
 
-RUBY_EXTERN rb_serial_t ruby_vm_global_cvar_state;
-
 void
 rb_class_subclass_add(VALUE super, VALUE klass)
 {
@@ -960,7 +957,6 @@ rb_include_class_new(VALUE module, VALUE super)
 	RCLASS_CONST_TBL(module) = rb_id_table_create(0);
     }
     RCLASS_IV_TBL(klass) = RCLASS_IV_TBL(module);
-    RCLASS_CVC_TBL(klass) = RCLASS_CVC_TBL(module);
     RCLASS_CONST_TBL(klass) = RCLASS_CONST_TBL(module);
 
     RCLASS_SET_SUPER(klass, super);
@@ -1089,8 +1085,6 @@ do_include_modules_at(const VALUE klass, VALUE c, VALUE module, int search_super
         VALUE super_class = RCLASS_SUPER(c);
 
         // invalidate inline method cache
-        RB_DEBUG_COUNTER_INC(cvar_include_invalidate);
-        ruby_vm_global_cvar_state++;
         tbl = RCLASS_M_TBL(module);
         if (tbl && rb_id_table_size(tbl)) {
             if (search_super) { // include
diff --git a/common.mk b/common.mk
index 5d8bad6e37..f3aa284fb5 100644
--- a/common.mk
+++ b/common.mk
@@ -2458,7 +2458,6 @@ class.$(OBJEXT): {$(VPATH)}backward/2/stdarg.h
 class.$(OBJEXT): {$(VPATH)}class.c
 class.$(OBJEXT): {$(VPATH)}config.h
 class.$(OBJEXT): {$(VPATH)}constant.h
-class.$(OBJEXT): {$(VPATH)}debug_counter.h
 class.$(OBJEXT): {$(VPATH)}defines.h
 class.$(OBJEXT): {$(VPATH)}encoding.h
 class.$(OBJEXT): {$(VPATH)}id.h
diff --git a/compile.c b/compile.c
index fa6af03c9c..a3a828fb1d 100644
--- a/compile.c
+++ b/compile.c
@@ -8044,9 +8044,8 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, in
 	if (!popped) {
 	    ADD_INSN(ret, line_node, dup);
 	}
-        ADD_INSN2(ret, line_node, setclassvariable,
-                  ID2SYM(node->nd_vid),
-                  get_ivar_ic_value(iseq,node->nd_vid));
+	ADD_INSN1(ret, line_node, setclassvariable,
+		  ID2SYM(node->nd_vid));
 	break;
       }
       case NODE_OP_ASGN1: {
@@ -8669,9 +8668,8 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, in
       }
       case NODE_CVAR:{
 	if (!popped) {
-	    ADD_INSN2(ret, line_node, getclassvariable,
-		      ID2SYM(node->nd_vid),
-		      get_ivar_ic_value(iseq,node->nd_vid));
+	    ADD_INSN1(ret, line_node, getclassvariable,
+		      ID2SYM(node->nd_vid));
 	}
 	break;
       }
diff --git a/debug_counter.h b/debug_counter.h
index 3cf80cc188..9452f4c737 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -24,12 +24,6 @@ RB_DEBUG_COUNTER(mc_inline_miss_same_cme)    // IMC miss, but same CME
 RB_DEBUG_COUNTER(mc_inline_miss_same_def)    // IMC miss, but same definition
 RB_DEBUG_COUNTER(mc_inline_miss_diff)        // IMC miss, different methods
 
-RB_DEBUG_COUNTER(cvar_write_inline_hit)      // cvar cache hit on write
-RB_DEBUG_COUNTER(cvar_read_inline_hit)       // cvar cache hit on read
-RB_DEBUG_COUNTER(cvar_inline_miss)           // miss inline cache
-RB_DEBUG_COUNTER(cvar_class_invalidate)      // invalidate cvar cache when define a cvar that's defined on a subclass
-RB_DEBUG_COUNTER(cvar_include_invalidate)    // invalidate cvar cache on module include or prepend
-
 RB_DEBUG_COUNTER(mc_cme_complement)          // number of acquiring complement CME
 RB_DEBUG_COUNTER(mc_cme_complement_hit)      // number of cache hit for complemented CME
 
diff --git a/gc.c b/gc.c
index b0837c32c1..3adc526ed1 100644
--- a/gc.c
+++ b/gc.c
@@ -3003,13 +3003,6 @@ cc_table_free(rb_objspace_t *objspace, VALUE klass, bool alive)
     }
 }
 
-static enum rb_id_table_iterator_result
-cvar_table_free_i(VALUE value, void * ctx)
-{
-    xfree((void *) value);
-    return ID_TABLE_CONTINUE;
-}
-
 void
 rb_cc_table_free(VALUE klass)
 {
@@ -3121,10 +3114,6 @@ obj_free(rb_objspace_t *objspace, VALUE obj)
 	if (RCLASS_IV_INDEX_TBL(obj)) {
             iv_index_tbl_free(RCLASS_IV_INDEX_TBL(obj));
 	}
-	if (RCLASS_CVC_TBL(obj)) {
-            rb_id_table_foreach_values(RCLASS_CVC_TBL(obj), cvar_table_free_i, NULL);
-            rb_id_table_free(RCLASS_CVC_TBL(obj));
-	}
 	if (RCLASS_SUBCLASSES(obj)) {
 	    if (BUILTIN_TYPE(obj) == T_MODULE) {
 		rb_class_detach_module_subclasses(obj);
@@ -4568,9 +4557,6 @@ obj_memsize_of(VALUE obj, int use_all_types)
 	    if (RCLASS_IV_TBL(obj)) {
 		size += st_memsize(RCLASS_IV_TBL(obj));
 	    }
-	    if (RCLASS_CVC_TBL(obj)) {
-		size += rb_id_table_memsize(RCLASS_CVC_TBL(obj));
-	    }
 	    if (RCLASS_IV_INDEX_TBL(obj)) {
                 // TODO: more correct value
 		size += st_memsize(RCLASS_IV_INDEX_TBL(obj));
@@ -9617,27 +9603,6 @@ update_cc_tbl(rb_objspace_t *objspace, VALUE klass)
     }
 }
 
-static enum rb_id_table_iterator_result
-update_cvc_tbl_i(ID id, VALUE cvc_entry, void *data)
-{
-    struct rb_cvar_class_tbl_entry *entry;
-
-    entry = (struct rb_cvar_class_tbl_entry *)cvc_entry;
-
-    entry->class_value = rb_gc_location(entry->class_value);
-
-    return ID_TABLE_CONTINUE;
-}
-
-static void
-update_cvc_tbl(rb_objspace_t *objspace, VALUE klass)
-{
-    struct rb_id_table *tbl = RCLASS_CVC_TBL(klass);
-    if (tbl) {
-        rb_id_table_foreach_with_replace(tbl, update_cvc_tbl_i, 0, objspace);
-    }
-}
-
 static enum rb_id_table_iterator_result
 update_const_table(VALUE value, void *data)
 {
@@ -9709,7 +9674,6 @@ gc_update_object_references(rb_objspace_t *objspace, VALUE obj)
         if (!RCLASS_EXT(obj)) break;
         update_m_tbl(objspace, RCLASS_M_TBL(obj));
         update_cc_tbl(objspace, obj);
-        update_cvc_tbl(objspace, obj);
 
         gc_update_tbl_refs(objspace, RCLASS_IV_TBL(obj));
 
diff --git a/id_table.c b/id_table.c
index 149f52cd88..840ab46ee3 100644
--- a/id_table.c
+++ b/id_table.c
@@ -92,7 +92,7 @@ rb_id_table_init(struct rb_id_table *tbl, int capa)
     return tbl;
 }
 
-MJIT_FUNC_EXPORTED struct rb_id_table *
+struct rb_id_table *
 rb_id_table_create(size_t capa)
 {
     struct rb_id_table *tbl = ALLOC(struct rb_id_table);
@@ -223,7 +223,7 @@ hash_table_show(struct rb_id_table *tbl)
 }
 #endif
 
-MJIT_FUNC_EXPORTED int
+int
 rb_id_table_lookup(struct rb_id_table *tbl, ID id, VALUE *valp)
 {
     id_key_t key = id2key(id);
@@ -253,7 +253,7 @@ rb_id_table_insert_key(struct rb_id_table *tbl, const id_key_t key, const VALUE
     return TRUE;
 }
 
-MJIT_FUNC_EXPORTED int
+int
 rb_id_table_insert(struct rb_id_table *tbl, ID id, VALUE val)
 {
     return rb_id_table_insert_key(tbl, id2key(id), val);
diff --git a/include/ruby/internal/intern/variable.h b/include/ruby/internal/intern/variable.h
index faa0cc004f..8210662fa0 100644
--- a/include/ruby/internal/intern/variable.h
+++ b/include/ruby/internal/intern/variable.h
@@ -72,7 +72,6 @@ VALUE rb_mod_const_missing(VALUE,VALUE);
 VALUE rb_cvar_defined(VALUE, ID);
 void rb_cvar_set(VALUE, ID, VALUE);
 VALUE rb_cvar_get(VALUE, ID);
-VALUE rb_cvar_find(VALUE, ID, VALUE*);
 void rb_cv_set(VALUE, const char*, VALUE);
 VALUE rb_cv_get(VALUE, const char*);
 void rb_define_class_variable(VALUE, const char*, VALUE);
diff --git a/insns.def b/insns.def
index e1e4577cd9..8d609927b5 100644
--- a/insns.def
+++ b/insns.def
@@ -230,28 +230,26 @@ setinstancevariable
 /* Get value of class variable id of klass as val. */
 DEFINE_INSN
 getclassvariable
-(ID id, IVC ic)
+(ID id)
 ()
 (VALUE val)
 /* "class variable access from toplevel" warning can be hooked. */
 // attr bool leaf = false; /* has rb_warning() */
 {
-    rb_cref_t * cref = vm_get_cref(GET_EP());
-    rb_control_frame_t *cfp = GET_CFP();
-    val = vm_getclassvariable(GET_ISEQ(), cref, cfp, id, (ICVARC)ic);
+    val = rb_cvar_get(vm_get_cvar_base(vm_get_cref(GET_EP()), GET_CFP(), 1), id);
 }
 
 /* Set value of class variable id of klass as val. */
 DEFINE_INSN
 setclassvariable
-(ID id, IVC ic)
+(ID id)
 (VALUE val)
 ()
 /* "class variable access from toplevel" warning can be hooked. */
 // attr bool leaf = false; /* has rb_warning() */
 {
     vm_ensure_not_refinement_module(GET_SELF());
-    vm_setclassvariable(GET_ISEQ(), vm_get_cref(GET_EP()), GET_CFP(), id,  val, (ICVARC)ic);
+    rb_cvar_set(vm_get_cvar_base(vm_get_cref(GET_EP()), GET_CFP(), 1), id, val);
 }
 
 /* Get constant variable id. If klass is Qnil and allow_nil is Qtrue, constants
diff --git a/internal/class.h b/internal/class.h
index 1d25d9e7eb..6c03a31a4e 100644
--- a/internal/class.h
+++ b/internal/class.h
@@ -31,12 +31,6 @@ struct rb_iv_index_tbl_entry {
     VALUE class_value;
 };
 
-struct rb_cvar_class_tbl_entry {
-    uint32_t index;
-    rb_serial_t global_cvar_state;
-    VALUE class_value;
-};
-
 struct rb_classext_struct {
     struct st_table *iv_index_tbl; // ID -> struct rb_iv_index_tbl_entry
     struct st_table *iv_tbl;
@@ -46,7 +40,6 @@ struct rb_classext_struct {
     struct rb_id_table *const_tbl;
     struct rb_id_table *callable_m_tbl;
     struct rb_id_table *cc_tbl; /* ID -> [[ci, cc1], cc2, ...] */
-    struct rb_id_table *cvc_tbl;
     struct rb_subclass_entry *subclasses;
     struct rb_subclass_entry **parent_subclasses;
     /**
@@ -90,7 +83,6 @@ typedef struct rb_classext_struct rb_classext_t;
 #endif
 #define RCLASS_CALLABLE_M_TBL(c) (RCLASS_EXT(c)->callable_m_tbl)
 #define RCLASS_CC_TBL(c) (RCLASS_EXT(c)->cc_tbl)
-#define RCLASS_CVC_TBL(c) (RCLASS_EXT(c)->cvc_tbl)
 #define RCLASS_IV_INDEX_TBL(c) (RCLASS_EXT(c)->iv_index_tbl)
 #define RCLASS_ORIGIN(c) (RCLASS_EXT(c)->origin_)
 #define RCLASS_REFINED_CLASS(c) (RCLASS_EXT(c)->refined_class)
diff --git a/variable.c b/variable.c
index 8c29fbdf3b..85ff35ba8c 100644
--- a/variable.c
+++ b/variable.c
@@ -39,9 +39,6 @@
 #include "ractor_core.h"
 #include "vm_sync.h"
 
-RUBY_EXTERN rb_serial_t ruby_vm_global_cvar_state;
-#define GET_GLOBAL_CVAR_STATE() (ruby_vm_global_cvar_state)
-
 typedef void rb_gvar_compact_t(void *var);
 
 static struct rb_id_table *rb_global_tbl;
@@ -3328,30 +3325,6 @@ cvar_overtaken(VALUE front, VALUE target, ID id)
     }
 }
 
-static VALUE
-find_cvar(VALUE klass, VALUE * front, VALUE * target, ID id)
-{
-    VALUE v = Qundef;
-    CVAR_ACCESSOR_SHOULD_BE_MAIN_RACTOR();
-    if (cvar_lookup_at(klass, id, (&v))) {
-        if (!*front) {
-            *front = klass;
-        }
-        *target = klass;
-    }
-
-    for (klass = cvar_front_klass(klass); klass; klass = RCLASS_SUPER(klass)) {
-	if (cvar_lookup_at(klass, id, (&v))) {
-            if (!*front) {
-                *front = klass;
-            }
-            *target = klass;
-        }
-    }
-
-    return v;
-}
-
 #define CVAR_FOREACH_ANCESTORS(klass, v, r) \
     for (klass = cvar_front_klass(klass); klass; klass = RCLASS_SUPER(klass)) { \
 	if (cvar_lookup_at(klass, id, (v))) { \
@@ -3365,20 +3338,6 @@ find_cvar(VALUE klass, VALUE * front, VALUE * target, ID id)
     CVAR_FOREACH_ANCESTORS(klass, v, r);\
 } while(0)
 
-static void
-check_for_cvar_table(VALUE subclass, VALUE key)
-{
-    st_table *tbl = RCLASS_IV_TBL(subclass);
-
-    if (tbl && st_lookup(tbl, key, NULL)) {
-        RB_DEBUG_COUNTER_INC(cvar_class_invalidate);
-        ruby_vm_global_cvar_state++;
-        return;
-    }
-
-    rb_class_foreach_subclass(subclass, check_for_cvar_table, key);
-}
-
 void
 rb_cvar_set(VALUE klass, ID id, VALUE val)
 {
@@ -3398,58 +3357,23 @@ rb_cvar_set(VALUE klass, ID id, VALUE val)
     }
     check_before_mod_set(target, id, val, "class variable");
 
-    int result = rb_class_ivar_set(target, id, val);
-
-    struct rb_id_table *rb_cvc_tbl = RCLASS_CVC_TBL(target);
-
-    if (!rb_cvc_tbl) {
-        rb_cvc_tbl = RCLASS_CVC_TBL(target) = rb_id_table_create(2);
-    }
-
-    struct rb_cvar_class_tbl_entry *ent;
-
-    if (!rb_id_table_lookup(rb_cvc_tbl, id, (VALUE*)&ent)) {
-        ent = ALLOC(struct rb_cvar_class_tbl_entry);
-        ent->class_value = target;
-        ent->global_cvar_state = GET_GLOBAL_CVAR_STATE();
-        rb_id_table_insert(rb_cvc_tbl, id, (VALUE)ent);
-        RB_DEBUG_COUNTER_INC(cvar_inline_miss);
-    } else {
-        ent->global_cvar_state = GET_GLOBAL_CVAR_STATE();
-    }
-
-    // Break the cvar cache if this is a new class variable
-    // and target is a module or a subclass with the same
-    // cvar in this lookup.
-    if (result == 0) {
-        if (RB_TYPE_P(target, T_CLASS)) {
-            if (RCLASS_SUBCLASSES(target)) {
-                rb_class_foreach_subclass(target, check_for_cvar_table, id);
-            }
-        }
-    }
-}
-
-VALUE
-rb_cvar_find(VALUE klass, ID id, VALUE *front)
-{
-    VALUE target = 0;
-    VALUE value;
-
-    value = find_cvar(klass, front, &target, id);
-    if (!target) {
-	rb_name_err_raise("uninitialized class variable %1$s in %2$s",
-			  klass, ID2SYM(id));
-    }
-    cvar_overtaken(*front, target, id);
-    return (VALUE)value;
+    rb_class_ivar_set(target, id, val);
 }
 
 VALUE
 rb_cvar_get(VALUE klass, ID id)
 {
-    VALUE front = 0;
-    return rb_cvar_find(klass, id, &front);
+    VALUE tmp, front = 0, target = 0;
+    st_data_t value;
+
+    tmp = klass;
+    CVAR_LOOKUP(&value, {if (!front) front = klass; target = klass;});
+    if (!target) {
+	rb_name_err_raise("uninitialized class variable %1$s in %2$s",
+			  tmp, ID2SYM(id));
+    }
+    cvar_overtaken(front, target, id);
+    return (VALUE)value;
 }
 
 VALUE
diff --git a/vm.c b/vm.c
index 14c125eef2..ea8b21e7a5 100644
--- a/vm.c
+++ b/vm.c
@@ -405,7 +405,6 @@ unsigned int    ruby_vm_event_local_num;
 
 rb_serial_t ruby_vm_global_constant_state = 1;
 rb_serial_t ruby_vm_class_serial = 1;
-rb_serial_t ruby_vm_global_cvar_state = 1;
 
 static const struct rb_callcache vm_empty_cc = {
     .flags = T_IMEMO | (imemo_callcache << FL_USHIFT) | VM_CALLCACHE_UNMARKABLE,
@@ -485,7 +484,7 @@ rb_dtrace_setup(rb_execution_context_t *ec, VALUE klass, ID id,
 static VALUE
 vm_stat(int argc, VALUE *argv, VALUE self)
 {
-    static VALUE sym_global_constant_state, sym_class_serial, sym_global_cvar_state;
+    static VALUE sym_global_constant_state, sym_class_serial;
     VALUE arg = Qnil;
     VALUE hash = Qnil, key = Qnil;
 
@@ -506,7 +505,6 @@ vm_stat(int argc, VALUE *argv, VALUE self)
 #define S(s) sym_##s = ID2SYM(rb_intern_const(#s))
 	S(global_constant_state);
 	S(class_serial);
-	S(global_cvar_state);
 #undef S
     }
 
@@ -518,7 +516,6 @@ vm_stat(int argc, VALUE *argv, VALUE self)
 
     SET(global_constant_state, ruby_vm_global_constant_state);
     SET(class_serial, ruby_vm_class_serial);
-    SET(global_cvar_state, ruby_vm_global_cvar_state);
 #undef SET
 
     if (!NIL_P(key)) { /* matched key should return above */
diff --git a/vm_core.h b/vm_core.h
index 7cb2490d7e..72120d5302 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -244,10 +244,6 @@ struct iseq_inline_iv_cache_entry {
     struct rb_iv_index_tbl_entry *entry;
 };
 
-struct iseq_inline_cvar_cache_entry {
-    struct rb_cvar_class_tbl_entry *entry;
-};
-
 union iseq_inline_storage_entry {
     struct {
 	struct rb_thread_struct *running_thread;
@@ -1154,7 +1150,6 @@ enum vm_svar_index {
 /* inline cache */
 typedef struct iseq_inline_constant_cache *IC;
 typedef struct iseq_inline_iv_cache_entry *IVC;
-typedef struct iseq_inline_cvar_cache_entry *ICVARC;
 typedef union iseq_inline_storage_entry *ISE;
 typedef const struct rb_callinfo *CALL_INFO;
 typedef const struct rb_callcache *CALL_CACHE;
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 72c90a8a5c..171b0f4273 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -951,7 +951,7 @@ vm_ensure_not_refinement_module(VALUE self)
 }
 
 static inline VALUE
-vm_get_iclass(const rb_control_frame_t *cfp, VALUE klass)
+vm_get_iclass(rb_control_frame_t *cfp, VALUE klass)
 {
     return klass;
 }
@@ -1041,7 +1041,7 @@ vm_get_ev_const(rb_execution_context_t *ec, VALUE orig_klass, ID id, bool allow_
 }
 
 static inline VALUE
-vm_get_cvar_base(const rb_cref_t *cref, const rb_control_frame_t *cfp, int top_level_raise)
+vm_get_cvar_base(const rb_cref_t *cref, rb_control_frame_t *cfp, int top_level_raise)
 {
     VALUE klass;
 
@@ -1281,86 +1281,6 @@ vm_setivar(VALUE obj, ID id, VALUE val, const rb_iseq_t *iseq, IVC ic, const str
     }
 }
 
-static inline VALUE
-vm_getclassvariable(const rb_iseq_t *iseq, const rb_cref_t *cref, const rb_control_frame_t *cfp, ID id, ICVARC ic)
-{
-    if (ic->entry && ic->entry->global_cvar_state == GET_GLOBAL_CVAR_STATE()) {
-        VALUE v = Qundef;
-        RB_DEBUG_COUNTER_INC(cvar_read_inline_hit);
-
-        if (st_lookup(RCLASS_IV_TBL(ic->entry->class_value), (st_data_t)id, &v)) {
-            return v;
-        }
-    }
-
-    VALUE klass = vm_get_cvar_base(cref, cfp, 1);
-    VALUE defined_class = 0;
-
-    VALUE cvar_value = rb_cvar_find(klass, id, &defined_class);
-
-    if (RB_TYPE_P(defined_class, T_ICLASS)) {
-        defined_class = RBASIC(defined_class)->klass;
-    }
-
-    struct rb_id_table *rb_cvc_tbl = RCLASS_CVC_TBL(defined_class);
-
-    if (!rb_cvc_tbl) {
-        rb_cvc_tbl = RCLASS_CVC_TBL(defined_class) = rb_id_table_create(2);
-    }
-
-    struct rb_cvar_class_tbl_entry *ent;
-
-    if (!rb_id_table_lookup(rb_cvc_tbl, id, (VALUE*)&ent)) {
-        rb_bug("should have cvar cache entry");
-    } else {
-        ent->global_cvar_state = GET_GLOBAL_CVAR_STATE();
-    }
-
-    ic->entry = ent;
-    RB_OBJ_WRITTEN(iseq, Qundef, ent->class_value);
-
-    return cvar_value;
-}
-
-static inline void
-vm_setclassvariable(const rb_iseq_t *iseq, const rb_cref_t *cref, const rb_control_frame_t *cfp, ID id, VALUE val, ICVARC ic)
-{
-    if (ic->entry && ic->entry->global_cvar_state == GET_GLOBAL_CVAR_STATE()) {
-        RB_DEBUG_COUNTER_INC(cvar_write_inline_hit);
-
-        rb_class_ivar_set(ic->entry->class_value, id, val);
-        return;
-    }
-
-    VALUE klass = vm_get_cvar_base(cref, cfp, 1);
-
-    rb_cvar_set(klass, id, val);
-
-    VALUE defined_class = 0;
-    rb_cvar_find(klass, id, &defined_class);
-
-    if (RB_TYPE_P(defined_class, T_ICLASS)) {
-        defined_class = RBASIC(defined_class)->klass;
-    }
-
-    struct rb_id_table *rb_cvc_tbl = RCLASS_CVC_TBL(defined_class);
-
-    if (!rb_cvc_tbl) {
-        rb_bug("the cvc table should be set");
-    }
-
-    struct rb_cvar_class_tbl_entry *ent;
-
-    if (!rb_id_table_lookup(rb_cvc_tbl, id, (VALUE*)&ent)) {
-        rb_bug("should have cvar cache entry");
-    } else {
-        ent->global_cvar_state = GET_GLOBAL_CVAR_STATE();
-    }
-
-    ic->entry = ent;
-    RB_OBJ_WRITTEN(iseq, Qundef, ent->class_value);
-}
-
 static inline VALUE
 vm_getinstancevariable(const rb_iseq_t *iseq, VALUE obj, ID id, IVC ic)
 {
diff --git a/vm_insnhelper.h b/vm_insnhelper.h
index 231aa60d52..18e7056303 100644
--- a/vm_insnhelper.h
+++ b/vm_insnhelper.h
@@ -16,7 +16,6 @@ RUBY_SYMBOL_EXPORT_BEGIN
 RUBY_EXTERN VALUE ruby_vm_const_missing_count;
 RUBY_EXTERN rb_serial_t ruby_vm_global_constant_state;
 RUBY_EXTERN rb_serial_t ruby_vm_class_serial;
-RUBY_EXTERN rb_serial_t ruby_vm_global_cvar_state;
 
 RUBY_SYMBOL_EXPORT_END
 
@@ -180,8 +179,6 @@ CC_SET_FASTPATH(const struct rb_callcache *cc, vm_call_handler func, bool enable
 #define NEXT_CLASS_SERIAL() (++ruby_vm_class_serial)
 #define GET_GLOBAL_CONSTANT_STATE() (ruby_vm_global_constant_state)
 #define INC_GLOBAL_CONSTANT_STATE() (++ruby_vm_global_constant_state)
-#define GET_GLOBAL_CVAR_STATE() (ruby_vm_global_cvar_state)
-#define INC_GLOBAL_CVAR_STATE() (++ruby_vm_global_cvar_state)
 
 static inline struct vm_throw_data *
 THROW_DATA_NEW(VALUE val, const rb_control_frame_t *cf, int st)