https://git.ruby-lang.org/ruby.git/commit/?id=132f7e11fd

From 132f7e11fd6715a9e2e09b06441de8d399728049 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Wed, 16 Sep 2020 15:30:23 -0400
Subject: Compile putnil

---
 ujit_compile.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/ujit_compile.c b/ujit_compile.c
index 60dc6a0927..5e958dd751 100644
--- a/ujit_compile.c
+++ b/ujit_compile.c
@@ -195,8 +195,20 @@ void gen_putobject_int2fix(codeblock_t* cb, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/ujit_compile.c#L195
     mov(cb, mem_opnd(64, RDI, 8), RCX);
 }
 
-// TODO: putnil
-// could we reuse code from putobject_int2fix here?
+void gen_putnil(codeblock_t* cb, ctx_t* ctx)
+{
+    // Load current SP into RAX
+    mov(cb, RAX, mem_opnd(64, RDI, 8));
+
+    // Write constant at SP
+    mov(cb, mem_opnd(64, RAX, 0), imm_opnd(Qnil));
+
+    // Load incremented SP into RCX
+    lea(cb, RCX, mem_opnd(64, RAX, 8));
+
+    // Write back incremented SP
+    mov(cb, mem_opnd(64, RDI, 8), RCX);
+}
 
 // TODO: implement putself
 
@@ -239,6 +251,7 @@ static void ujit_init() https://github.com/ruby/ruby/blob/trunk/ujit_compile.c#L251
     // Map YARV opcodes to the corresponding codegen functions
     st_insert(gen_fns, (st_data_t)BIN(nop), (st_data_t)&gen_nop);
     st_insert(gen_fns, (st_data_t)BIN(pop), (st_data_t)&gen_pop);
+    st_insert(gen_fns, (st_data_t)BIN(putnil), (st_data_t)&gen_putnil);
     st_insert(gen_fns, (st_data_t)BIN(putobject_INT2FIX_0_), (st_data_t)&gen_putobject_int2fix);
     st_insert(gen_fns, (st_data_t)BIN(putobject_INT2FIX_1_), (st_data_t)&gen_putobject_int2fix);
     st_insert(gen_fns, (st_data_t)BIN(getlocal_WC_0), (st_data_t)&gen_getlocal_wc0);
-- 
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