180 lines
4.1 KiB
C++
180 lines
4.1 KiB
C++
// Copyright (c) 2011-2016 The Cryptonote developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "gtest/gtest.h"
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#include "Common/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_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_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_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_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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}
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