https://git.ruby-lang.org/ruby.git/commit/?id=ddca3482ef

From ddca3482ef53911ce732c91e715d0439d3b47514 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Mon, 29 Aug 2022 18:05:06 -0700
Subject: Check only symbol flag bits (#6301)

* Check only symbol flag bits

* Check all 4 bits
---
 yjit/src/codegen.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/yjit/src/codegen.rs b/yjit/src/codegen.rs
index 07e8500f62..744495eb29 100644
--- a/yjit/src/codegen.rs
+++ b/yjit/src/codegen.rs
@@ -3454,7 +3454,8 @@ fn jit_guard_known_klass( https://github.com/ruby/ruby/blob/trunk/yjit/src/codegen.rs#L3454
 
             asm.comment("guard object is static symbol");
             assert!(RUBY_SPECIAL_SHIFT == 8);
-            asm.cmp(obj_opnd, Opnd::UImm(RUBY_SYMBOL_FLAG as u64));
+            let flag_bits = asm.and(obj_opnd, Opnd::UImm(0xf));
+            asm.cmp(flag_bits, Opnd::UImm(RUBY_SYMBOL_FLAG as u64));
             jit_chain_guard(JCC_JNE, jit, ctx, asm, ocb, max_chain_depth, side_exit);
             ctx.upgrade_opnd_type(insn_opnd, Type::ImmSymbol);
         }
-- 
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