text: // Copyright 2006-2008 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include <stdlib.h>
  
  #include "src/v8.h"
  
  #include "src/base/platform/platform.h"
  #include "src/diy-fp.h"
  #include "test/cctest/cctest.h"
  
  namespace v8 {
  namespace internal {
  
  TEST(Subtract) {
    DiyFp diy_fp1 = DiyFp(3, 0);
    DiyFp diy_fp2 = DiyFp(1, 0);
    DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
  
    CHECK_EQ(2, diff.f());
    CHECK_EQ(0, diff.e());
    diy_fp1.Subtract(diy_fp2);
    CHECK_EQ(2, diy_fp1.f());
    CHECK_EQ(0, diy_fp1.e());
  }
  
  
  TEST(Multiply) {
    DiyFp diy_fp1 = DiyFp(3, 0);
    DiyFp diy_fp2 = DiyFp(2, 0);
    DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);
  
    CHECK_EQ(0, product.f());
    CHECK_EQ(64, product.e());
    diy_fp1.Multiply(diy_fp2);
    CHECK_EQ(0, diy_fp1.f());
    CHECK_EQ(64, diy_fp1.e());
  
    diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000000), 11);
    diy_fp2 = DiyFp(2, 13);
    product = DiyFp::Times(diy_fp1, diy_fp2);
    CHECK_EQ(1, product.f());
    CHECK_EQ(11 + 13 + 64, product.e());
  
    // Test rounding.
    diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000001), 11);
    diy_fp2 = DiyFp(1, 13);
    product = DiyFp::Times(diy_fp1, diy_fp2);
    CHECK_EQ(1, product.f());
    CHECK_EQ(11 + 13 + 64, product.e());
  
    diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x7FFFFFFF, FFFFFFFF), 11);
    diy_fp2 = DiyFp(1, 13);
    product = DiyFp::Times(diy_fp1, diy_fp2);
    CHECK_EQ(0, product.f());
    CHECK_EQ(11 + 13 + 64, product.e());
  
    // Halfway cases are allowed to round either way. So don't check for it.
  
    // Big numbers.
    diy_fp1 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 11);
    diy_fp2 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 13);
    // 128bit result: 0xFFFFFFFFFFFFFFFE0000000000000001
    product = DiyFp::Times(diy_fp1, diy_fp2);
    CHECK(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFE) == product.f());
    CHECK_EQ(11 + 13 + 64, product.e());
  }
  
  }  // namespace internal
  }  // namespace v8
  