From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/test/-ext-/bignum/test_mul.rb | 137 +++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 jni/ruby/test/-ext-/bignum/test_mul.rb

(limited to 'jni/ruby/test/-ext-/bignum/test_mul.rb')

diff --git a/jni/ruby/test/-ext-/bignum/test_mul.rb b/jni/ruby/test/-ext-/bignum/test_mul.rb
new file mode 100644
index 0000000..3e78247
--- /dev/null
+++ b/jni/ruby/test/-ext-/bignum/test_mul.rb
@@ -0,0 +1,137 @@
+require 'test/unit'
+require "-test-/bignum"
+
+class TestBignum < Test::Unit::TestCase
+  class TestMul < Test::Unit::TestCase
+
+    SIZEOF_BDIGIT = Bignum::SIZEOF_BDIGIT
+    BITSPERDIG = Bignum::BITSPERDIG
+    BDIGMAX = (1 << BITSPERDIG) - 1
+
+    def test_mul_normal
+      x = (1 << BITSPERDIG) | 1
+      y = (1 << BITSPERDIG) | 1
+      z = (1 << (BITSPERDIG*2)) | (2 << BITSPERDIG) | 1
+      assert_equal(z, x.big_mul_normal(y))
+    end
+
+    def test_mul_normal_zero_in_x
+      x = (1 << (2*BITSPERDIG)) | 1
+      y = (1 << BITSPERDIG) | 1
+      z = (1 << (BITSPERDIG*3)) | (1 << (BITSPERDIG*2)) | (1 << BITSPERDIG) | 1
+      assert_equal(z, x.big_mul_normal(y))
+    end
+
+    def test_mul_normal_zero_in_y
+      x = (1 << BITSPERDIG) | 1
+      y = (1 << (2*BITSPERDIG)) | 1
+      z = (1 << (BITSPERDIG*3)) | (1 << (BITSPERDIG*2)) | (1 << BITSPERDIG) | 1
+      assert_equal(z, x.big_mul_normal(y))
+    end
+
+    def test_mul_normal_max_max
+      x = (1 << (2*BITSPERDIG)) - 1
+      y = (1 << (2*BITSPERDIG)) - 1
+      z = (1 << (4*BITSPERDIG)) - (1 << (2*BITSPERDIG+1)) + 1
+      assert_equal(z, x.big_mul_normal(y))
+    end
+
+    def test_sq_fast
+      x = (1 << BITSPERDIG) | 1
+      z = (1 << 2*BITSPERDIG) | (2 << BITSPERDIG) | 1
+      assert_equal(z, x.big_sq_fast)
+    end
+
+    def test_sq_fast_max2
+      x = (BDIGMAX << BITSPERDIG) | BDIGMAX
+      assert_equal(x.big_mul_normal(x), x.big_sq_fast)
+    end
+
+    def test_sq_fast_zero_in_middle
+      x = (BDIGMAX << 2*BITSPERDIG) | BDIGMAX
+      assert_equal(x.big_mul_normal(x), x.big_sq_fast)
+    end
+
+    def test_mul_balance
+      x = (1 << BITSPERDIG) | 1
+      y = (1 << BITSPERDIG) | 1
+      z = (1 << (BITSPERDIG*2)) | (2 << BITSPERDIG) | 1
+      assert_equal(z, x.big_mul_balance(y))
+    end
+
+    def test_mul_balance_2x16
+      x = (1 << Bignum::BITSPERDIG) | 1
+      y = (1 << Bignum::BITSPERDIG*16) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_balance(y))
+    end
+
+    def test_mul_balance_2x17
+      x = (1 << Bignum::BITSPERDIG) | 1
+      y = (1 << Bignum::BITSPERDIG*17) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_balance(y))
+    end
+
+    def test_mul_karatsuba
+      x = (1 << BITSPERDIG) | 1
+      y = (1 << BITSPERDIG) | 1
+      z = (1 << (BITSPERDIG*2)) | (2 << BITSPERDIG) | 1
+      assert_equal(z, x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_odd_y
+      x = (1 << BITSPERDIG) | 1
+      y = (1 << (2*BITSPERDIG)) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_odd_xy
+      x = (1 << (2*BITSPERDIG)) | 1
+      y = (1 << (2*BITSPERDIG)) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_x1_gt_x0
+      x = (2 << BITSPERDIG) | 1
+      y = (1 << BITSPERDIG) | 2
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_y1_gt_y0
+      x = (1 << BITSPERDIG) | 2
+      y = (2 << BITSPERDIG) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_x1_gt_x0_and_y1_gt_y0
+      x = (2 << BITSPERDIG) | 1
+      y = (2 << BITSPERDIG) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_carry2
+      x = (1 << BITSPERDIG) | BDIGMAX
+      y = (1 << BITSPERDIG) | BDIGMAX
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_karatsuba_borrow
+      x = (BDIGMAX << BITSPERDIG) | 1
+      y = (BDIGMAX << BITSPERDIG) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_karatsuba(y))
+    end
+
+    def test_mul_toom3
+      x = (1 << 2*BITSPERDIG) | (1 << BITSPERDIG) | 1
+      y = (1 << 2*BITSPERDIG) | (1 << BITSPERDIG) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_toom3(y))
+    end
+
+    def test_mul_gmp
+      x = (1 << 2*BITSPERDIG) | (1 << BITSPERDIG) | 1
+      y = (1 << 2*BITSPERDIG) | (1 << BITSPERDIG) | 1
+      assert_equal(x.big_mul_normal(y), x.big_mul_gmp(y))
+    rescue NotImplementedError
+    end
+
+  end
+end
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