https://git.ruby-lang.org/ruby.git/commit/?id=a02002dc4f

From a02002dc4f051515c0b65c17b2ed797bac454b56 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Tue, 27 Jul 2021 23:40:51 -0700
Subject: More detection of immediate constants

---
 yjit_codegen.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index ebb75cbdad..388c8b1e17 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -128,9 +128,17 @@ jit_type_of_value(VALUE val) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L128
             return TYPE_FIXNUM;
         } else if (NIL_P(val)) {
             return TYPE_NIL;
+        } else if (val == Qtrue) {
+            return TYPE_TRUE;
+        } else if (val == Qfalse) {
+            return TYPE_FALSE;
+        } else if (STATIC_SYM_P(val)) {
+            return TYPE_STATIC_SYMBOL;
+        } else if (FLONUM_P(val)) {
+            return TYPE_FLONUM;
         } else {
-            // generic immediate
-            return TYPE_IMM;
+            RUBY_ASSERT(false);
+            UNREACHABLE_RETURN(TYPE_IMM);
         }
     } else {
         switch (BUILTIN_TYPE(val)) {
-- 
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