https://git.ruby-lang.org/ruby.git/commit/?id=fa63052be1

From fa63052be19b26d39b22689ad9969aa83909809e Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Sun, 13 Dec 2020 01:32:17 +0900
Subject: create ccs with 0 capa

ccs is created with default 4 capa, but it is too much, so start
with 0 and extend to 1, 2, 4, 8, ...

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 9a94b10..5e77b7f 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1534,11 +1534,11 @@ vm_ccs_create(VALUE klass, const rb_callable_method_entry_t *cme) https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L1534
 #if VM_CHECK_MODE > 0
     ccs->debug_sig = ~(VALUE)ccs;
 #endif
-    ccs->capa = 4;
+    ccs->capa = 0;
     ccs->len = 0;
     RB_OBJ_WRITE(klass, &ccs->cme, cme);
     METHOD_ENTRY_CACHED_SET((rb_callable_method_entry_t *)cme);
-    ccs->entries = ALLOC_N(struct rb_class_cc_entries_entry, ccs->capa);
+    ccs->entries = NULL;
     return ccs;
 }
 
@@ -1553,12 +1553,14 @@ vm_ccs_push(VALUE klass, struct rb_class_cc_entries *ccs, const struct rb_callin https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L1553
     }
 
     if (UNLIKELY(ccs->len == ccs->capa)) {
-        const int nsize = ccs->capa * 2;
-        struct rb_class_cc_entries_entry *nents = ALLOC_N(struct rb_class_cc_entries_entry, nsize);
-        ccs->capa = nsize;
-        MEMCPY(nents, &ccs->entries[0], struct rb_class_cc_entries_entry, ccs->len);
-        ruby_xfree(ccs->entries);
-        ccs->entries = nents;
+        if (ccs->capa == 0) {
+            ccs->capa = 1;
+            ccs->entries = ALLOC_N(struct rb_class_cc_entries_entry, ccs->capa);
+        }
+        else {
+            ccs->capa *= 2;
+            REALLOC_N(ccs->entries, struct rb_class_cc_entries_entry, ccs->capa);
+        }
     }
     VM_ASSERT(ccs->len < ccs->capa);
 
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