forked from townforge/townforge
322 lines
8.6 KiB
C++
322 lines
8.6 KiB
C++
// Copyright (c) 2014-2020, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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#include "gtest/gtest.h"
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#include "int-util.h"
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namespace
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{
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TEST(mul128, handles_zero)
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{
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uint64_t hi, lo;
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lo = mul128(0, 0, &hi);
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ASSERT_EQ(lo, 0);
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ASSERT_EQ(hi, 0);
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lo = mul128(7, 0, &hi);
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ASSERT_EQ(lo, 0);
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ASSERT_EQ(hi, 0);
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lo = mul128(0, 7, &hi);
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ASSERT_EQ(lo, 0);
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ASSERT_EQ(hi, 0);
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}
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TEST(mul128, handles_one)
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{
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uint64_t hi, lo;
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lo = mul128(1, 1, &hi);
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ASSERT_EQ(lo, 1);
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ASSERT_EQ(hi, 0);
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lo = mul128(7, 1, &hi);
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ASSERT_EQ(lo, 7);
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ASSERT_EQ(hi, 0);
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lo = mul128(1, 7, &hi);
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ASSERT_EQ(lo, 7);
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ASSERT_EQ(hi, 0);
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}
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TEST(mul128_without_carry, multiplies_correctly)
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{
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uint64_t hi, lo;
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lo = mul128(0x3333333333333333, 5, &hi);
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ASSERT_EQ(lo, 0xffffffffffffffff);
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ASSERT_EQ(hi, 0);
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lo = mul128(5, 0x3333333333333333, &hi);
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ASSERT_EQ(lo, 0xffffffffffffffff);
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ASSERT_EQ(hi, 0);
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lo = mul128(0x1111111111111111, 0x1111111111111111, &hi);
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ASSERT_EQ(lo, 0x0fedcba987654321);
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ASSERT_EQ(hi, 0x0123456789abcdf0);
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}
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TEST(mul128_with_carry_1_only, multiplies_correctly)
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{
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uint64_t hi, lo;
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lo = mul128(0xe0000000e0000000, 0xe0000000e0000000, &hi);
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ASSERT_EQ(lo, 0xc400000000000000);
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ASSERT_EQ(hi, 0xc400000188000000);
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}
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TEST(mul128_with_carry_2_only, multiplies_correctly)
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{
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uint64_t hi, lo;
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lo = mul128(0x10000000ffffffff, 0x10000000ffffffff, &hi);
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ASSERT_EQ(lo, 0xdffffffe00000001);
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ASSERT_EQ(hi, 0x0100000020000000);
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}
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TEST(mul128_with_carry_1_and_2, multiplies_correctly)
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{
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uint64_t hi, lo;
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lo = mul128(0xf1f2f3f4f5f6f7f8, 0xf9f0fafbfcfdfeff, &hi);
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ASSERT_EQ(lo, 0x52118e5f3b211008);
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ASSERT_EQ(hi, 0xec39104363716e59);
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lo = mul128(0xffffffffffffffff, 0xffffffffffffffff, &hi);
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ASSERT_EQ(lo, 0x0000000000000001);
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ASSERT_EQ(hi, 0xfffffffffffffffe);
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}
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TEST(div128_32, handles_zero)
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{
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uint32_t reminder;
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uint64_t hi;
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uint64_t lo;
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reminder = div128_32(0, 0, 7, &hi, &lo);
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ASSERT_EQ(reminder, 0);
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ASSERT_EQ(hi, 0);
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ASSERT_EQ(lo, 0);
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// Division by zero is UB, so can be tested correctly
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}
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TEST(div128_64, handles_zero)
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{
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uint64_t qhi, qlo, rhi, rlo;
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div128_64(0, 0, 7, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0);
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ASSERT_EQ(qhi, 0);
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ASSERT_EQ(qlo, 0);
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// Division by zero is UB, so can be tested correctly
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}
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TEST(div128_32, handles_one)
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{
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uint32_t reminder;
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uint64_t hi;
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uint64_t lo;
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reminder = div128_32(0, 7, 1, &hi, &lo);
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ASSERT_EQ(reminder, 0);
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ASSERT_EQ(hi, 0);
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ASSERT_EQ(lo, 7);
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reminder = div128_32(7, 0, 1, &hi, &lo);
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ASSERT_EQ(reminder, 0);
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ASSERT_EQ(hi, 7);
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ASSERT_EQ(lo, 0);
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}
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TEST(div128_64, handles_one)
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{
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uint64_t qhi, qlo, rhi, rlo;
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div128_64(0, 7, 1, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0);
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ASSERT_EQ(qhi, 0);
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ASSERT_EQ(qlo, 7);
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div128_64(7, 0, 1, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0);
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ASSERT_EQ(qhi, 7);
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ASSERT_EQ(qlo, 0);
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}
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TEST(div128_32, handles_if_dividend_less_divider)
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{
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uint32_t reminder;
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uint64_t hi;
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uint64_t lo;
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reminder = div128_32(0, 1383746, 1645825, &hi, &lo);
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ASSERT_EQ(reminder, 1383746);
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ASSERT_EQ(hi, 0);
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ASSERT_EQ(lo, 0);
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}
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TEST(div128_64, handles_if_dividend_less_divider)
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{
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uint64_t qhi, qlo, rhi, rlo;
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div128_64(0, 1383746, 1645825, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 1383746);
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ASSERT_EQ(qhi, 0);
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ASSERT_EQ(qlo, 0);
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}
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TEST(div128_32, handles_if_dividend_dwords_less_divider)
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{
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uint32_t reminder;
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uint64_t hi;
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uint64_t lo;
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reminder = div128_32(0x5AD629E441074F28, 0x0DBCAB2B231081F1, 0xFE735CD6, &hi, &lo);
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ASSERT_EQ(reminder, 0xB9C924E9);
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ASSERT_EQ(hi, 0x000000005B63C274);
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ASSERT_EQ(lo, 0x9084FC024383E48C);
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}
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TEST(div128_64, handles_if_dividend_dwords_less_divider)
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{
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uint64_t qhi, qlo, rhi, rlo;
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div128_64(0x5AD629E441074F28, 0x0DBCAB2B231081F1, 0xFE735CD6, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0xB9C924E9);
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ASSERT_EQ(qhi, 0x000000005B63C274);
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ASSERT_EQ(qlo, 0x9084FC024383E48C);
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}
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TEST(div128_32, works_correctly)
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{
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uint32_t reminder;
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uint64_t hi;
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uint64_t lo;
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reminder = div128_32(2, 0, 2, &hi, &lo);
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ASSERT_EQ(reminder, 0);
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ASSERT_EQ(hi, 1);
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ASSERT_EQ(lo, 0);
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reminder = div128_32(0xffffffffffffffff, 0, 0xffffffff, &hi, &lo);
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ASSERT_EQ(reminder, 0);
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ASSERT_EQ(hi, 0x0000000100000001);
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ASSERT_EQ(lo, 0);
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reminder = div128_32(0xffffffffffffffff, 5846, 0xffffffff, &hi, &lo);
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ASSERT_EQ(reminder, 5846);
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ASSERT_EQ(hi, 0x0000000100000001);
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ASSERT_EQ(lo, 0);
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reminder = div128_32(0xffffffffffffffff - 1, 0, 0xffffffff, &hi, &lo);
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ASSERT_EQ(reminder, 0xfffffffe);
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ASSERT_EQ(hi, 0x0000000100000000);
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ASSERT_EQ(lo, 0xfffffffefffffffe);
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reminder = div128_32(0x2649372534875028, 0xaedbfedc5adbc739, 0x27826534, &hi, &lo);
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ASSERT_EQ(reminder, 0x1a6dc2e5);
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ASSERT_EQ(hi, 0x00000000f812c1f8);
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ASSERT_EQ(lo, 0xddf2fdb09bc2e2e9);
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}
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TEST(div128_64, works_correctly)
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{
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uint64_t qhi, qlo, rhi, rlo;
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div128_64(2, 0, 2, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0);
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ASSERT_EQ(qhi, 1);
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ASSERT_EQ(qlo, 0);
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div128_64(0xffffffffffffffff, 0, 0xffffffff, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0);
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ASSERT_EQ(qhi, 0x0000000100000001);
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ASSERT_EQ(qlo, 0);
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div128_64(0xffffffffffffffff, 5846, 0xffffffff, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 5846);
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ASSERT_EQ(qhi, 0x0000000100000001);
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ASSERT_EQ(qlo, 0);
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div128_64(0xffffffffffffffff - 1, 0, 0xffffffff, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0xfffffffe);
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ASSERT_EQ(qhi, 0x0000000100000000);
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ASSERT_EQ(qlo, 0xfffffffefffffffe);
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div128_64(0x2649372534875028, 0xaedbfedc5adbc739, 0x27826534, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0x1a6dc2e5);
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ASSERT_EQ(qhi, 0x00000000f812c1f8);
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ASSERT_EQ(qlo, 0xddf2fdb09bc2e2e9);
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}
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TEST(div128_64, divisor_above_32_bit)
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{
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uint64_t qhi, qlo, rhi, rlo;
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div128_64(0, 0xffffffff, (uint64_t)0x100000000, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0xffffffff);
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ASSERT_EQ(qhi, 0);
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ASSERT_EQ(qlo, 0);
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div128_64(0, 65, 4, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 1);
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ASSERT_EQ(qhi, 0);
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ASSERT_EQ(qlo, 16);
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div128_64(405997335029502627ull, 2552775575832427192ull, 489327483788363ull, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 198332080500810ull);
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ASSERT_EQ(qhi, 829ull);
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ASSERT_EQ(qlo, 13000245803763621514ull);
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div128_64(405997335029502627ull, 2552775575832427192ull, 1ull, &qhi, &qlo, &rhi, &rlo);
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ASSERT_EQ(rhi, 0);
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ASSERT_EQ(rlo, 0);
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ASSERT_EQ(qhi, 405997335029502627ull);
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ASSERT_EQ(qlo, 2552775575832427192ull);
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}
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}
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