https://git.ruby-lang.org/ruby.git/commit/?id=3a4be429b5

From 3a4be429b50062122d1616256de38649464d3146 Mon Sep 17 00:00:00 2001
From: wanabe <s.wanabe@g...>
Date: Sun, 16 Aug 2020 18:53:39 +0900
Subject: Refactor to reduce "swap" instruction of pattern matching


diff --git a/compile.c b/compile.c
index f2ab7c3..519e12f 100644
--- a/compile.c
+++ b/compile.c
@@ -6333,6 +6333,7 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no https://github.com/ruby/ruby/blob/trunk/compile.c#L6333
     INIT_ANCHOR(body_seq);
     INIT_ANCHOR(cond_seq);
 
+    ADD_INSN(head, line, putnil); /* allocate stack for cached #deconstruct value */
     CHECK(COMPILE(head, "case base", node->nd_head));
 
     branches = decl_branch_base(iseq, node, "case");
@@ -6345,8 +6346,6 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no https://github.com/ruby/ruby/blob/trunk/compile.c#L6346
     endlabel = NEW_LABEL(line);
     elselabel = NEW_LABEL(line);
 
-    ADD_INSN(head, line, putnil); /* allocate stack for cached #deconstruct value */
-    ADD_INSN(head, line, swap);
     ADD_SEQ(ret, head);	/* case VAL */
 
     while (type == NODE_IN) {
-- 
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