https://git.ruby-lang.org/ruby.git/commit/?id=ed85e8a33a

From ed85e8a33ac13c75967f8a893bb5de22b729c1ef Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Fri, 27 Aug 2021 15:41:24 -0400
Subject: Use reg1 in GEN_COUNTER_INC to avoid clobbering RAX

---
 yjit_codegen.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index 0abf2376c6..a42bd1b871 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -306,9 +306,11 @@ static void https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L306
 _gen_counter_inc(codeblock_t *cb, int64_t *counter)
 {
     if (!rb_yjit_opts.gen_stats) return;
-     mov(cb, REG0, const_ptr_opnd(counter));
-     cb_write_lock_prefix(cb); // for ractors.
-     add(cb, mem_opnd(64, REG0, 0), imm_opnd(1));
+
+    // Use REG1 because there might be return value in REG0
+    mov(cb, REG1, const_ptr_opnd(counter));
+    cb_write_lock_prefix(cb); // for ractors.
+    add(cb, mem_opnd(64, REG1, 0), imm_opnd(1));
 }
 
 // Increment a counter then take an existing side exit.
-- 
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