https://git.ruby-lang.org/ruby.git/commit/?id=2eac297f9f

From 2eac297f9f9edc3ec61d087924b30ce40c84b772 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Wed, 10 Feb 2021 20:01:18 -0500
Subject: Optimize gen_dup

---
 ujit_codegen.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/ujit_codegen.c b/ujit_codegen.c
index 14d6b305c1..ee47f49af6 100644
--- a/ujit_codegen.c
+++ b/ujit_codegen.c
@@ -247,12 +247,15 @@ ujit_gen_block(ctx_t* ctx, block_t* block) https://github.com/ruby/ruby/blob/trunk/ujit_codegen.c#L247
 static bool
 gen_dup(jitstate_t* jit, ctx_t* ctx)
 {
-    x86opnd_t dup_val = ctx_stack_pop(ctx, 1);
-    x86opnd_t loc0 = ctx_stack_push(ctx, T_NONE);
-    x86opnd_t loc1 = ctx_stack_push(ctx, T_NONE);
+    // Get the top value and its type
+    x86opnd_t dup_val = ctx_stack_pop(ctx, 0);
+    int dup_type = ctx_get_top_type(ctx);
+
+    // Push the same value on top
+    x86opnd_t loc0 = ctx_stack_push(ctx, dup_type);
     mov(cb, REG0, dup_val);
     mov(cb, loc0, REG0);
-    mov(cb, loc1, REG0);
+
     return true;
 }
 
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