Allow calling variadic cfuncs with many args

We have a check to ensure we don't have to push args on the stack to
call a cfunc with many args. However we never need to use the stack for
variadic cfuncs, so we shouldn't care about the number of arguments.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/ruby/test_yjit.rb b/test/ruby/test_yjit.rb
index ccd0e6bae0..587e6d3f1d 100644
--- a/test/ruby/test_yjit.rb
+++ b/test/ruby/test_yjit.rb
@@ -217,6 +217,20 @@ class TestYJIT < Test::Unit::TestCase
     RUBY
   end
 
+  # Tests calling a variadic cfunc with many args
+  def test_build_large_struct
+    assert_compiles(<<~RUBY, insns: %i[opt_send_without_block], min_calls: 2)
+      ::Foo = Struct.new(:a, :b, :c, :d, :e, :f, :g, :h)
+
+      def build_foo
+        ::Foo.new(:a, :b, :c, :d, :e, :f, :g, :h)
+      end
+
+      build_foo
+      build_foo
+    RUBY
+  end
+
   def test_fib_recursion
     assert_compiles(<<~'RUBY', insns: %i[opt_le opt_minus opt_plus opt_send_without_block], result: 34)
       def fib(n)