https://git.ruby-lang.org/ruby.git/commit/?id=922aed92b5

From 922aed92b5e4602571d191e62904304458c9998d Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Wed, 30 Jun 2021 16:53:49 -0700
Subject: Add codegen for rb_true and rb_false

These are used by .nil? and therefore opt_nil_p
---
 yjit_codegen.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index 9eff50b2e4..77a0e02de4 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -2813,6 +2813,28 @@ jit_rb_obj_not(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci, const https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L2813
     return true;
 }
 
+// Codegen for rb_true()
+static bool
+jit_rb_true(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci, const rb_callable_method_entry_t *cme, rb_iseq_t *block, const int32_t argc)
+{
+    ADD_COMMENT(cb, "nil? == true");
+    ctx_stack_pop(ctx, 1);
+    x86opnd_t stack_ret = ctx_stack_push(ctx, TYPE_TRUE);
+    mov(cb, stack_ret, imm_opnd(Qtrue));
+    return true;
+}
+
+// Codegen for rb_false()
+static bool
+jit_rb_false(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci, const rb_callable_method_entry_t *cme, rb_iseq_t *block, const int32_t argc)
+{
+    ADD_COMMENT(cb, "nil? == false");
+    ctx_stack_pop(ctx, 1);
+    x86opnd_t stack_ret = ctx_stack_push(ctx, TYPE_FALSE);
+    mov(cb, stack_ret, imm_opnd(Qfalse));
+    return true;
+}
+
 // Check if we know how to codegen for a particular cfunc method
 static method_codegen_t
 lookup_cfunc_codegen(const rb_method_definition_t *def)
@@ -4103,4 +4125,7 @@ yjit_init_codegen(void) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L4125
     yjit_method_codegen_table = st_init_numtable();
 
     yjit_reg_method(rb_cBasicObject, "!", jit_rb_obj_not);
+
+    yjit_reg_method(rb_cNilClass, "nil?", jit_rb_true);
+    yjit_reg_method(rb_mKernel, "nil?", jit_rb_false);
 }
-- 
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