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Add double-conversion to third_party (#447)

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Gautham 2022-06-26 16:11:55 +05:30 • committed by GitHub
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third_party/double-conversion/test/test-diy-fp.cc vendored Normal file
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// 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 "libc/isystem/stdlib.h"
#include "third_party/double-conversion/test/cctest.h"
#include "third_party/double-conversion/diy-fp.h"
#include "third_party/double-conversion/utils.h"
using namespace double_conversion;
TEST(Subtract) {
DiyFp diy_fp1 = DiyFp(3, 0);
DiyFp diy_fp2 = DiyFp(1, 0);
DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
CHECK(2 == diff.f()); // NOLINT
CHECK_EQ(0, diff.e());
diy_fp1.Subtract(diy_fp2);
CHECK(2 == diy_fp1.f()); // NOLINT
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(0 == product.f()); // NOLINT
CHECK_EQ(64, product.e());
diy_fp1.Multiply(diy_fp2);
CHECK(0 == diy_fp1.f()); // NOLINT
CHECK_EQ(64, diy_fp1.e());
diy_fp1 = DiyFp(DOUBLE_CONVERSION_UINT64_2PART_C(0x80000000, 00000000), 11);
diy_fp2 = DiyFp(2, 13);
product = DiyFp::Times(diy_fp1, diy_fp2);
CHECK(1 == product.f()); // NOLINT
CHECK_EQ(11 + 13 + 64, product.e());
// Test rounding.
diy_fp1 = DiyFp(DOUBLE_CONVERSION_UINT64_2PART_C(0x80000000, 00000001), 11);
diy_fp2 = DiyFp(1, 13);
product = DiyFp::Times(diy_fp1, diy_fp2);
CHECK(1 == product.f()); // NOLINT
CHECK_EQ(11 + 13 + 64, product.e());
diy_fp1 = DiyFp(DOUBLE_CONVERSION_UINT64_2PART_C(0x7fffffff, ffffffff), 11);
diy_fp2 = DiyFp(1, 13);
product = DiyFp::Times(diy_fp1, diy_fp2);
CHECK(0 == product.f()); // NOLINT
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(DOUBLE_CONVERSION_UINT64_2PART_C(0xFFFFFFFF, FFFFFFFF), 11);
diy_fp2 = DiyFp(DOUBLE_CONVERSION_UINT64_2PART_C(0xFFFFFFFF, FFFFFFFF), 13);
// 128bit result: 0xfffffffffffffffe0000000000000001
product = DiyFp::Times(diy_fp1, diy_fp2);
CHECK(DOUBLE_CONVERSION_UINT64_2PART_C(0xFFFFFFFF, FFFFFFFe) == product.f());
CHECK_EQ(11 + 13 + 64, product.e());
}