1 files changed, 41 insertions, 0 deletions
diff --git a/ext/-test-/bignum/mul.c b/ext/-test-/bignum/mul.c
new file mode 100644
index 0000000000..18ab3f7633
--- /dev/null
+++ b/ext/-test-/bignum/mul.c
@@ -0,0 +1,41 @@
+#include "ruby.h"
+#include "internal.h"
+
+static VALUE
+big(VALUE x)
+{
+    if (FIXNUM_P(x))
+        return rb_int2big(FIX2LONG(x));
+    if (RB_TYPE_P(x, T_BIGNUM))
+        return x;
+    rb_raise(rb_eTypeError, "can't convert %s to Bignum",
+            rb_obj_classname(x));
+}
+
+static VALUE
+mul_normal(VALUE x, VALUE y)
+{
+    return rb_big_norm(rb_big_mul_normal(big(x), big(y)));
+}
+
+static VALUE
+mul_balance(VALUE x, VALUE y)
+{
+    return rb_big_norm(rb_big_mul_balance(big(x), big(y)));
+}
+
+static VALUE
+mul_karatsuba(VALUE x, VALUE y)
+{
+    return rb_big_norm(rb_big_mul_karatsuba(big(x), big(y)));
+}
+
+void
+Init_mul(VALUE klass)
+{
+    rb_define_const(rb_cBignum, "SIZEOF_BDIGITS", INT2NUM(SIZEOF_BDIGITS));
+    rb_define_const(rb_cBignum, "BITSPERDIG", INT2NUM(SIZEOF_BDIGITS * CHAR_BIT));
+    rb_define_method(rb_cInteger, "big_mul_normal", mul_normal, 1);
+    rb_define_method(rb_cInteger, "big_mul_balance", mul_balance, 1);
+    rb_define_method(rb_cInteger, "big_mul_karatsuba", mul_karatsuba, 1);
+}