68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
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// Copyright 2006-2008 the V8 project authors. All rights reserved.
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#include <stdlib.h>
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#include "v8.h"
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#include "platform.h"
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#include "cctest.h"
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#include "diy_fp.h"
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using namespace v8::internal;
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TEST(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(2 == diff.f()); // NOLINT
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CHECK_EQ(0, diff.e());
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diy_fp1.Subtract(diy_fp2);
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CHECK(2 == diy_fp1.f()); // NOLINT
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CHECK_EQ(0, diy_fp1.e());
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}
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TEST(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(0 == product.f()); // NOLINT
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CHECK_EQ(64, product.e());
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diy_fp1.Multiply(diy_fp2);
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CHECK(0 == diy_fp1.f()); // NOLINT
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CHECK_EQ(64, diy_fp1.e());
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diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000000), 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(1 == product.f()); // NOLINT
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CHECK_EQ(11 + 13 + 64, product.e());
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// Test rounding.
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diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x80000000, 00000001), 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(1 == product.f()); // NOLINT
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CHECK_EQ(11 + 13 + 64, product.e());
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diy_fp1 = DiyFp(V8_2PART_UINT64_C(0x7fffffff, ffffffff), 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(0 == product.f()); // NOLINT
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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(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 11);
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diy_fp2 = DiyFp(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFF), 13);
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// 128bit result: 0xfffffffffffffffe0000000000000001
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product = DiyFp::Times(diy_fp1, diy_fp2);
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CHECK(V8_2PART_UINT64_C(0xFFFFFFFF, FFFFFFFe) == product.f());
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CHECK_EQ(11 + 13 + 64, product.e());
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}
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