From a439fc2f175f5c272886a7be57c6444015450401 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Wed, 6 Dec 2023 12:19:43 -0800
Subject: YJIT: Avoid register allocation conflict with a higher stack_idx
 (#9143)

YJIT: Avoid register allocation conflict

with a higher stack_idx
---
 bootstraptest/test_yjit.rb | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'bootstraptest')

diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index 1a4db302d0..ba288a7936 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -4273,3 +4273,21 @@ assert_normal_exit %q{
   Foo.class_eval "def initialize() #{ivars} end"
   Foo.new
 }
+
+assert_equal '0', %q{
+  def spill
+    1.to_i # not inlined
+  end
+
+  def inline(_stack1, _stack2, _stack3, _stack4, _stack5)
+    0 # inlined
+  end
+
+  def entry
+    # RegTemps is 00111110 prior to the #inline call.
+    # Its return value goes to stack_idx=0, which conflicts with stack_idx=5.
+    inline(spill, 2, 3, 4, 5)
+  end
+
+  entry
+}
-- 
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