https://git.ruby-lang.org/ruby.git/commit/?id=6cb4edd73f

From 6cb4edd73ff23809887a72293b670d9c9de2a8fe Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Wed, 30 Jun 2021 16:04:25 -0400
Subject: Implement swap instruction

---
 yjit_codegen.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index 2470853dd1..0c1b0da7a4 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -567,6 +567,28 @@ gen_dupn(jitstate_t* jit, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L567
     return YJIT_KEEP_COMPILING;
 }
 
+// Swap top 2 stack entries
+static codegen_status_t
+gen_swap(jitstate_t* jit, ctx_t* ctx)
+{
+    val_type_t type0 = ctx_get_opnd_type(ctx, OPND_STACK(0));
+    x86opnd_t opnd0 = ctx_stack_opnd(ctx, 0);
+
+    val_type_t type1 = ctx_get_opnd_type(ctx, OPND_STACK(1));
+    x86opnd_t opnd1 = ctx_stack_opnd(ctx, 1);
+
+    mov(cb, REG0, opnd0);
+    mov(cb, REG1, opnd1);
+
+    ctx_set_opnd_type(ctx, OPND_STACK(0), type1);
+    ctx_set_opnd_type(ctx, OPND_STACK(1), type0);
+
+    mov(cb, opnd0, REG1);
+    mov(cb, opnd1, REG0);
+
+    return YJIT_KEEP_COMPILING;
+}
+
 // set Nth stack entry to stack top
 static codegen_status_t
 gen_setn(jitstate_t* jit, ctx_t* ctx)
@@ -3406,6 +3428,7 @@ yjit_init_codegen(void) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L3428
     yjit_reg_op(BIN(nop), gen_nop);
     yjit_reg_op(BIN(dup), gen_dup);
     yjit_reg_op(BIN(dupn), gen_dupn);
+    yjit_reg_op(BIN(swap), gen_swap);
     yjit_reg_op(BIN(setn), gen_setn);
     yjit_reg_op(BIN(topn), gen_topn);
     yjit_reg_op(BIN(pop), gen_pop);
-- 
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