4ecbc7cf72
... diy-fp-unittest. Bug: v8:12781 Change-Id: I7cb996c095ec0c946ed2db311dfd815e1cbd459b Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3676643 Reviewed-by: Leszek Swirski <leszeks@chromium.org> Commit-Queue: 王澳 <wangao.james@bytedance.com> Cr-Commit-Position: refs/heads/main@{#80831}
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "src/base/numbers/diy-fp.h"
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#include <stdlib.h>
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#include "src/base/platform/platform.h"
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#include "src/init/v8.h"
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#include "test/unittests/test-utils.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace v8 {
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namespace base {
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using DiyFpTest = ::testing::Test;
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TEST_F(DiyFpTest, Subtract) {
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DiyFp diy_fp1 = DiyFp(3, 0);
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DiyFp diy_fp2 = DiyFp(1, 0);
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DiyFp diff = DiyFp::Minus(diy_fp1, diy_fp2);
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CHECK_EQ(2, diff.f());
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CHECK_EQ(0, diff.e());
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diy_fp1.Subtract(diy_fp2);
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CHECK_EQ(2, diy_fp1.f());
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CHECK_EQ(0, diy_fp1.e());
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}
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TEST_F(DiyFpTest, Multiply) {
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DiyFp diy_fp1 = DiyFp(3, 0);
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DiyFp diy_fp2 = DiyFp(2, 0);
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DiyFp product = DiyFp::Times(diy_fp1, diy_fp2);
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CHECK_EQ(0, product.f());
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CHECK_EQ(64, product.e());
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diy_fp1.Multiply(diy_fp2);
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CHECK_EQ(0, diy_fp1.f());
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CHECK_EQ(64, diy_fp1.e());
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diy_fp1 = DiyFp(0x8000'0000'0000'0000, 11);
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diy_fp2 = DiyFp(2, 13);
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product = DiyFp::Times(diy_fp1, diy_fp2);
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CHECK_EQ(1, product.f());
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CHECK_EQ(11 + 13 + 64, product.e());
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// Test rounding.
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diy_fp1 = DiyFp(0x8000'0000'0000'0001, 11);
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diy_fp2 = DiyFp(1, 13);
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product = DiyFp::Times(diy_fp1, diy_fp2);
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CHECK_EQ(1, product.f());
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CHECK_EQ(11 + 13 + 64, product.e());
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diy_fp1 = DiyFp(0x7FFF'FFFF'FFFF'FFFF, 11);
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diy_fp2 = DiyFp(1, 13);
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product = DiyFp::Times(diy_fp1, diy_fp2);
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CHECK_EQ(0, product.f());
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CHECK_EQ(11 + 13 + 64, product.e());
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// Halfway cases are allowed to round either way. So don't check for it.
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// Big numbers.
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diy_fp1 = DiyFp(0xFFFF'FFFF'FFFF'FFFF, 11);
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diy_fp2 = DiyFp(0xFFFF'FFFF'FFFF'FFFF, 13);
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// 128bit result: 0xFFFFFFFFFFFFFFFE0000000000000001
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product = DiyFp::Times(diy_fp1, diy_fp2);
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CHECK_EQ(0xFFFF'FFFF'FFFF'FFFE, product.f());
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CHECK_EQ(11 + 13 + 64, product.e());
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}
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} // namespace base
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} // namespace v8
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