https://git.ruby-lang.org/ruby.git/commit/?id=3677b233dd

From 3677b233ddc5c0410b71590e709bb9e940e58fa3 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maximechevalierb@g...>
Date: Tue, 11 May 2021 12:51:05 -0400
Subject: Implement opt_nil_p and opt_empty_b by delegating to send (#35)

---
 yjit_codegen.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index 5e5b3b2f35..00a69942df 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -1627,10 +1627,35 @@ gen_opt_mod(jitstate_t* jit, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L1627
 static codegen_status_t
 gen_opt_ltlt(jitstate_t* jit, ctx_t* ctx)
 {
-    // Delegate to send, call the ltlt method
+    // Delegate to send, call the method on the recv
     return gen_opt_send_without_block(jit, ctx);
 }
 
+static codegen_status_t
+gen_opt_nil_p(jitstate_t* jit, ctx_t* ctx)
+{
+    // Delegate to send, call the method on the recv
+    return gen_opt_send_without_block(jit, ctx);
+}
+
+static codegen_status_t
+gen_opt_empty_p(jitstate_t* jit, ctx_t* ctx)
+{
+    // Delegate to send, call the method on the recv
+    return gen_opt_send_without_block(jit, ctx);
+}
+
+static codegen_status_t
+gen_opt_not(jitstate_t* jit, ctx_t* ctx)
+{
+    // TODO: can we implement a fast path?
+    // Most likely, almost every input to opt_not is true/false/nil?
+
+    // NOTE: we can't really delegate to OSWB because we currently
+    // don't support calls to methods on true/false/nil
+    return YJIT_CANT_COMPILE;
+}
+
 void
 gen_branchif_branch(codeblock_t* cb, uint8_t* target0, uint8_t* target1, uint8_t shape)
 {
@@ -2661,6 +2686,9 @@ yjit_init_codegen(void) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L2686
     yjit_reg_op(BIN(opt_plus), gen_opt_plus);
     yjit_reg_op(BIN(opt_mod), gen_opt_mod);
     yjit_reg_op(BIN(opt_ltlt), gen_opt_ltlt);
+    yjit_reg_op(BIN(opt_nil_p), gen_opt_nil_p);
+    yjit_reg_op(BIN(opt_empty_p), gen_opt_empty_p);
+    yjit_reg_op(BIN(opt_not), gen_opt_not);
     yjit_reg_op(BIN(opt_getinlinecache), gen_opt_getinlinecache);
     yjit_reg_op(BIN(branchif), gen_branchif);
     yjit_reg_op(BIN(branchunless), gen_branchunless);
-- 
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