diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/test/uint256_tests.cpp | 71 | ||||
| -rw-r--r-- | src/uint256.h | 70 |
2 files changed, 141 insertions, 0 deletions
diff --git a/src/test/uint256_tests.cpp b/src/test/uint256_tests.cpp index 8e4b63c8bc..226d737def 100644 --- a/src/test/uint256_tests.cpp +++ b/src/test/uint256_tests.cpp @@ -482,6 +482,77 @@ BOOST_AUTO_TEST_CASE( plusMinus ) } +BOOST_AUTO_TEST_CASE( multiply ) +{ + BOOST_CHECK((R1L * R1L).ToString() == "62a38c0486f01e45879d7910a7761bf30d5237e9873f9bff3642a732c4d84f10"); + BOOST_CHECK((R1L * R2L).ToString() == "de37805e9986996cfba76ff6ba51c008df851987d9dd323f0e5de07760529c40"); + BOOST_CHECK((R1L * ZeroL) == ZeroL); + BOOST_CHECK((R1L * OneL) == R1L); + BOOST_CHECK((R1L * MaxL) == -R1L); + BOOST_CHECK((R2L * R1L) == (R1L * R2L)); + BOOST_CHECK((R2L * R2L).ToString() == "ac8c010096767d3cae5005dec28bb2b45a1d85ab7996ccd3e102a650f74ff100"); + BOOST_CHECK((R2L * ZeroL) == ZeroL); + BOOST_CHECK((R2L * OneL) == R2L); + BOOST_CHECK((R2L * MaxL) == -R2L); + + BOOST_CHECK((R1S * R1S).ToString() == "a7761bf30d5237e9873f9bff3642a732c4d84f10"); + BOOST_CHECK((R1S * R2S).ToString() == "ba51c008df851987d9dd323f0e5de07760529c40"); + BOOST_CHECK((R1S * ZeroS) == ZeroS); + BOOST_CHECK((R1S * OneS) == R1S); + BOOST_CHECK((R1S * MaxS) == -R1S); + BOOST_CHECK((R2S * R1S) == (R1S * R2S)); + BOOST_CHECK((R2S * R2S).ToString() == "c28bb2b45a1d85ab7996ccd3e102a650f74ff100"); + BOOST_CHECK((R2S * ZeroS) == ZeroS); + BOOST_CHECK((R2S * OneS) == R2S); + BOOST_CHECK((R2S * MaxS) == -R2S); + + BOOST_CHECK(MaxL * MaxL == OneL); + BOOST_CHECK(MaxS * MaxS == OneS); + + BOOST_CHECK((R1L * 0) == 0); + BOOST_CHECK((R1L * 1) == R1L); + BOOST_CHECK((R1L * 3).ToString() == "7759b1c0ed14047f961ad09b20ff83687876a0181a367b813634046f91def7d4"); + BOOST_CHECK((R2L * 0x87654321UL).ToString() == "23f7816e30c4ae2017257b7a0fa64d60402f5234d46e746b61c960d09a26d070"); + BOOST_CHECK((R1S * 0) == 0); + BOOST_CHECK((R1S * 1) == R1S); + BOOST_CHECK((R1S * 7).ToString() == "f7a987f3c3bf758d927f202d7e795faeff084244"); + BOOST_CHECK((R2S * 0xFFFFFFFFUL).ToString() == "1c6f6c930353e17f7d6127213bb18d2883e2cd90"); +} + +BOOST_AUTO_TEST_CASE( divide ) +{ + uint256 D1L("AD7133AC1977FA2B7"); + uint256 D2L("ECD751716"); + BOOST_CHECK((R1L / D1L).ToString() == "00000000000000000b8ac01106981635d9ed112290f8895545a7654dde28fb3a"); + BOOST_CHECK((R1L / D2L).ToString() == "000000000873ce8efec5b67150bad3aa8c5fcb70e947586153bf2cec7c37c57a"); + BOOST_CHECK(R1L / OneL == R1L); + BOOST_CHECK(R1L / MaxL == ZeroL); + BOOST_CHECK(MaxL / R1L == 2); + BOOST_CHECK_THROW(R1L / ZeroL, uint_error); + BOOST_CHECK((R2L / D1L).ToString() == "000000000000000013e1665895a1cc981de6d93670105a6b3ec3b73141b3a3c5"); + BOOST_CHECK((R2L / D2L).ToString() == "000000000e8f0abe753bb0afe2e9437ee85d280be60882cf0bd1aaf7fa3cc2c4"); + BOOST_CHECK(R2L / OneL == R2L); + BOOST_CHECK(R2L / MaxL == ZeroL); + BOOST_CHECK(MaxL / R2L == 1); + BOOST_CHECK_THROW(R2L / ZeroL, uint_error); + + uint160 D1S("D3C5EDCDEA54EB92679F0A4B4"); + uint160 D2S("13037"); + BOOST_CHECK((R1S / D1S).ToString() == "0000000000000000000000000db9af3beade6c02"); + BOOST_CHECK((R1S / D2S).ToString() == "000098dfb6cc40ca592bf74366794f298ada205c"); + BOOST_CHECK(R1S / OneS == R1S); + BOOST_CHECK(R1S / MaxS == ZeroS); + BOOST_CHECK(MaxS / R1S == 1); + BOOST_CHECK_THROW(R1S / ZeroS, uint_error); + BOOST_CHECK((R2S / D1S).ToString() == "0000000000000000000000000c5608e781182047"); + BOOST_CHECK((R2S / D2S).ToString() == "00008966751b7187c3c67c1fda5cea7db2c1c069"); + BOOST_CHECK(R2S / OneS == R2S); + BOOST_CHECK(R2S / MaxS == ZeroS); + BOOST_CHECK(MaxS / R2S == 1); + BOOST_CHECK_THROW(R2S / ZeroS, uint_error); +} + + bool almostEqual(double d1, double d2) { return fabs(d1-d2) <= 4*fabs(d1)*std::numeric_limits<double>::epsilon(); diff --git a/src/uint256.h b/src/uint256.h index b6365bb36b..7b17694eb2 100644 --- a/src/uint256.h +++ b/src/uint256.h @@ -222,6 +222,57 @@ public: return *this; } + base_uint& operator*=(uint32_t b32) + { + uint64_t carry = 0; + for (int i = 0; i < WIDTH; i++) + { + uint64_t n = carry + (uint64_t)b32 * pn[i]; + pn[i] = n & 0xffffffff; + carry = n >> 32; + } + return *this; + } + + base_uint& operator*=(const base_uint& b) + { + base_uint a = *this; + *this = 0; + for (int j = 0; j < WIDTH; j++) { + uint64_t carry = 0; + for (int i = 0; i + j < WIDTH; i++) { + uint64_t n = carry + pn[i + j] + (uint64_t)a.pn[j] * b.pn[i]; + pn[i + j] = n & 0xffffffff; + carry = n >> 32; + } + } + return *this; + } + + base_uint& operator/=(const base_uint& b) + { + base_uint div = b; // make a copy, so we can shift. + base_uint num = *this; // make a copy, so we can subtract. + *this = 0; // the quotient. + int num_bits = num.bits(); + int div_bits = div.bits(); + if (div_bits == 0) + throw uint_error("Division by zero"); + if (div_bits > num_bits) // the result is certainly 0. + return *this; + int shift = num_bits - div_bits; + div <<= shift; // shift so that div and nun align. + while (shift >= 0) { + if (num >= div) { + num -= div; + pn[shift / 32] |= (1 << (shift & 31)); // set a bit of the result. + } + div >>= 1; // shift back. + shift--; + } + // num now contains the remainder of the division. + return *this; + } base_uint& operator++() { @@ -338,11 +389,14 @@ public: friend inline const base_uint operator+(const base_uint& a, const base_uint& b) { return base_uint(a) += b; } friend inline const base_uint operator-(const base_uint& a, const base_uint& b) { return base_uint(a) -= b; } + friend inline const base_uint operator*(const base_uint& a, const base_uint& b) { return base_uint(a) *= b; } + friend inline const base_uint operator/(const base_uint& a, const base_uint& b) { return base_uint(a) /= b; } friend inline const base_uint operator|(const base_uint& a, const base_uint& b) { return base_uint(a) |= b; } friend inline const base_uint operator&(const base_uint& a, const base_uint& b) { return base_uint(a) &= b; } friend inline const base_uint operator^(const base_uint& a, const base_uint& b) { return base_uint(a) ^= b; } friend inline const base_uint operator>>(const base_uint& a, int shift) { return base_uint(a) >>= shift; } friend inline const base_uint operator<<(const base_uint& a, int shift) { return base_uint(a) <<= shift; } + friend inline const base_uint operator*(const base_uint& a, uint32_t b) { return base_uint(a) *= b; } std::string GetHex() const { @@ -417,6 +471,22 @@ public: return sizeof(pn); } + // Returns the position of the highest bit set plus one, or zero if the + // value is zero. + unsigned int bits() const + { + for (int pos = WIDTH-1; pos >= 0; pos--) { + if (pn[pos]) { + for (int bits = 31; bits > 0; bits--) { + if (pn[pos] & 1<<bits) + return 32*pos + bits + 1; + } + return 32*pos + 1; + } + } + return 0; + } + uint64_t GetLow64() const { assert(WIDTH >= 2); |