https://git.ruby-lang.org/ruby.git/commit/?id=5b68d14c2f

From 5b68d14c2fcacc2f185a1933ce9b102cb06b1ba5 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Mon, 27 Sep 2021 22:28:33 -0700
Subject: Add optimized Thread.current

---
 yjit_codegen.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index e788ac2797..7e765b2503 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -3053,6 +3053,23 @@ jit_rb_str_to_s(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci, const https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L3053
     return false;
 }
 
+static bool
+jit_thread_s_current(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, VALUE *recv_known_klass)
+{
+    ADD_COMMENT(cb, "Thread.current");
+    ctx_stack_pop(ctx, 1);
+
+    // ec->thread_ptr
+    mov(cb, REG0, member_opnd(REG_EC, rb_execution_context_t, thread_ptr));
+
+    // thread->self
+    mov(cb, REG0, member_opnd(REG0, rb_thread_t, self));
+
+    x86opnd_t stack_ret = ctx_stack_push(ctx, TYPE_HEAP);
+    mov(cb, stack_ret, REG0);
+    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)
@@ -4493,4 +4510,7 @@ yjit_init_codegen(void) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L4510
     // rb_str_to_s() methods in string.c
     yjit_reg_method(rb_cString, "to_s", jit_rb_str_to_s);
     yjit_reg_method(rb_cString, "to_str", jit_rb_str_to_s);
+
+    // Thread.current
+    yjit_reg_method(rb_singleton_class(rb_cThread), "current", jit_thread_s_current);
 }
-- 
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