https://git.ruby-lang.org/ruby.git/commit/?id=e7909467df

From e7909467df181641b1753512cba3f49c0f0f6583 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Mon, 25 Jan 2021 16:42:42 -0500
Subject: Eliminate type checks in opt_lt

---
 ujit_codegen.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/ujit_codegen.c b/ujit_codegen.c
index a38ecf18bb..e10e276fe2 100644
--- a/ujit_codegen.c
+++ b/ujit_codegen.c
@@ -532,14 +532,20 @@ gen_opt_lt(jitstate_t* jit, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/ujit_codegen.c#L532
     jnz_ptr(cb, side_exit);
 
     // Get the operands and destination from the stack
+    int arg1_type = ctx_get_top_type(ctx);
     x86opnd_t arg1 = ctx_stack_pop(ctx, 1);
+    int arg0_type = ctx_get_top_type(ctx);
     x86opnd_t arg0 = ctx_stack_pop(ctx, 1);
 
     // If not fixnums, fall back
-    test(cb, arg0, imm_opnd(RUBY_FIXNUM_FLAG));
-    jz_ptr(cb, side_exit);
-    test(cb, arg1, imm_opnd(RUBY_FIXNUM_FLAG));
-    jz_ptr(cb, side_exit);
+    if (arg0_type != T_FIXNUM) {
+        test(cb, arg0, imm_opnd(RUBY_FIXNUM_FLAG));
+        jz_ptr(cb, side_exit);
+    }
+    if (arg1_type != T_FIXNUM) {
+        test(cb, arg1, imm_opnd(RUBY_FIXNUM_FLAG));
+        jz_ptr(cb, side_exit);
+    }
 
     // Compare the arguments
     mov(cb, REG0, arg0);
-- 
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