https://git.ruby-lang.org/ruby.git/commit/?id=352e923242

From 352e923242a23ba661a8cf91e4c43c156f7d7519 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 17 Aug 2020 14:09:20 +0900
Subject: Revisit "Refactor to reduce "swap" instruction of pattern matching"

Just moved "case base" after allocating cache space.

diff --git a/compile.c b/compile.c
index f2ab7c3..8af2f89 100644
--- a/compile.c
+++ b/compile.c
@@ -6333,8 +6333,6 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no https://github.com/ruby/ruby/blob/trunk/compile.c#L6333
     INIT_ANCHOR(body_seq);
     INIT_ANCHOR(cond_seq);
 
-    CHECK(COMPILE(head, "case base", node->nd_head));
-
     branches = decl_branch_base(iseq, node, "case");
 
     node = node->nd_body;
@@ -6346,7 +6344,9 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no https://github.com/ruby/ruby/blob/trunk/compile.c#L6344
     elselabel = NEW_LABEL(line);
 
     ADD_INSN(head, line, putnil); /* allocate stack for cached #deconstruct value */
-    ADD_INSN(head, line, swap);
+
+    CHECK(COMPILE(head, "case base", orig_node->nd_head));
+
     ADD_SEQ(ret, head);	/* case VAL */
 
     while (type == NODE_IN) {
-- 
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