Optimized instruction for Array#freeze

If an Array which is empty or only using literals is frozen, we detect
this as a peephole optimization and change the instructions to be
`opt_ary_freeze`.

[Feature #20684]

Co-authored-by: Jean Boussier <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 227bfa2004..bc133f4013 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -6110,6 +6110,17 @@ vm_objtostring(const rb_iseq_t *iseq, VALUE recv, CALL_DATA cd)
 }
 
 static VALUE
+vm_opt_ary_freeze(VALUE ary, int bop, ID id)
+{
+    if (BASIC_OP_UNREDEFINED_P(bop, ARRAY_REDEFINED_OP_FLAG)) {
+        return ary;
+    }
+    else {
+        return Qundef;
+    }
+}
+
+static VALUE
 vm_opt_str_freeze(VALUE str, int bop, ID id)
 {
     if (BASIC_OP_UNREDEFINED_P(bop, STRING_REDEFINED_OP_FLAG)) {