Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
119 lines
5.4 KiB
119 lines
5.4 KiB
// Copyright 2017 The Abseil Authors. |
|
// |
|
// Licensed under the Apache License, Version 2.0 (the "License"); |
|
// you may not use this file except in compliance with the License. |
|
// You may obtain a copy of the License at |
|
// |
|
// https://www.apache.org/licenses/LICENSE-2.0 |
|
// |
|
// Unless required by applicable law or agreed to in writing, software |
|
// distributed under the License is distributed on an "AS IS" BASIS, |
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
// See the License for the specific language governing permissions and |
|
// limitations under the License. |
|
|
|
#include "absl/random/internal/wide_multiply.h" |
|
|
|
#include "gmock/gmock.h" |
|
#include "gtest/gtest.h" |
|
#include "absl/numeric/int128.h" |
|
|
|
using absl::random_internal::MultiplyU128ToU256; |
|
using absl::random_internal::U256; |
|
|
|
namespace { |
|
|
|
U256 LeftShift(U256 v, int s) { |
|
if (s == 0) { |
|
return v; |
|
} else if (s < 128) { |
|
return {(v.hi << s) | (v.lo >> (128 - s)), v.lo << s}; |
|
} else { |
|
return {v.lo << (s - 128), 0}; |
|
} |
|
} |
|
|
|
MATCHER_P2(Eq256, hi, lo, "") { return arg.hi == hi && arg.lo == lo; } |
|
MATCHER_P(Eq256, v, "") { return arg.hi == v.hi && arg.lo == v.lo; } |
|
|
|
TEST(WideMultiplyTest, MultiplyU128ToU256Test) { |
|
using absl::uint128; |
|
constexpr uint128 k1 = 1; |
|
constexpr uint128 kMax = ~static_cast<uint128>(0); |
|
|
|
EXPECT_THAT(MultiplyU128ToU256(0, 0), Eq256(0, 0)); |
|
|
|
// Max uin128_t |
|
EXPECT_THAT(MultiplyU128ToU256(kMax, kMax), Eq256(kMax << 1, 1)); |
|
EXPECT_THAT(MultiplyU128ToU256(kMax, 1), Eq256(0, kMax)); |
|
EXPECT_THAT(MultiplyU128ToU256(1, kMax), Eq256(0, kMax)); |
|
for (int i = 0; i < 64; ++i) { |
|
SCOPED_TRACE(i); |
|
EXPECT_THAT(MultiplyU128ToU256(kMax, k1 << i), |
|
Eq256(LeftShift({0, kMax}, i))); |
|
EXPECT_THAT(MultiplyU128ToU256(k1 << i, kMax), |
|
Eq256(LeftShift({0, kMax}, i))); |
|
} |
|
|
|
// 1-bit x 1-bit. |
|
for (int i = 0; i < 64; ++i) { |
|
for (int j = 0; j < 64; ++j) { |
|
EXPECT_THAT(MultiplyU128ToU256(k1 << i, k1 << j), |
|
Eq256(LeftShift({0, 1}, i + j))); |
|
} |
|
} |
|
|
|
// Verified multiplies |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0xc502da0d6ea99fe8, 0xfa3c9141a1f50912), |
|
absl::MakeUint128(0x96bcf1ac37f97bd6, 0x27e2cdeb5fb2299e)), |
|
Eq256(absl::MakeUint128(0x740113d838f96a64, 0x22e8cfa4d71f89ea), |
|
absl::MakeUint128(0x19184a345c62e993, 0x237871b630337b1c))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0x6f29e670cee07230, 0xc3d8e6c3e4d86759), |
|
absl::MakeUint128(0x3227d29fa6386db1, 0x231682bb1e4b764f)), |
|
Eq256(absl::MakeUint128(0x15c779d9d5d3b07c, 0xd7e6c827f0c81cbe), |
|
absl::MakeUint128(0xf88e3914f7fa287a, 0x15b79975137dea77))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0xafb77107215646e1, 0x3b844cb1ac5769e7), |
|
absl::MakeUint128(0x1ff7b2d888b62479, 0x92f758ae96fcba0b)), |
|
Eq256(absl::MakeUint128(0x15f13b70181f6985, 0x2adb36bbabce7d02), |
|
absl::MakeUint128(0x6c470d72e13aad04, 0x63fba3f5841762ed))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0xd85d5558d67ac905, 0xf88c70654dae19b1), |
|
absl::MakeUint128(0x17252c6727db3738, 0x399ff658c511eedc)), |
|
Eq256(absl::MakeUint128(0x138fcdaf8b0421ee, 0x1b465ddf2a0d03f6), |
|
absl::MakeUint128(0x8f573ba68296860f, 0xf327d2738741a21c))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0x46f0421a37ff6bee, 0xa61df89f09d140b1), |
|
absl::MakeUint128(0x3d712ec9f37ca2e1, 0x9658a2cba47ef4b1)), |
|
Eq256(absl::MakeUint128(0x11069cc48ee7c95d, 0xd35fb1c7aa91c978), |
|
absl::MakeUint128(0xbe2f4a6de874b015, 0xd2f7ac1b76746e61))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0x730d27c72d58fa49, 0x3ebeda7498f8827c), |
|
absl::MakeUint128(0xa2c959eca9f503af, 0x189c687eb842bbd8)), |
|
Eq256(absl::MakeUint128(0x4928d0ea356ba022, 0x1546d34a2963393), |
|
absl::MakeUint128(0x7481531e1e0a16d1, 0xdd8025015cf6aca0))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0x6ca41020f856d2f1, 0xb9b0838c04a7f4aa), |
|
absl::MakeUint128(0x9cf41d28a8396f54, 0x1d681695e377ffe6)), |
|
Eq256(absl::MakeUint128(0x429b92934d9be6f1, 0xea182877157c1e7), |
|
absl::MakeUint128(0x7135c23f0a4a475, 0xc1adc366f4a126bc))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0x57472833797c332, 0x6c79272fdec4687a), |
|
absl::MakeUint128(0xb5f022ea3838e46b, 0x16face2f003e27a6)), |
|
Eq256(absl::MakeUint128(0x3e072e0962b3400, 0x5d9fe8fdc3d0e1f4), |
|
absl::MakeUint128(0x7dc0df47cedafd62, 0xbe6501f1acd2551c))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0xf0fb4198322eb1c2, 0xfe7f5f31f3885938), |
|
absl::MakeUint128(0xd99012b71bb7aa31, 0xac7a6f9eb190789)), |
|
Eq256(absl::MakeUint128(0xcccc998cf075ca01, 0x642d144322fb873a), |
|
absl::MakeUint128(0xc79dc12b69d91ed4, 0xa83459132ce046f8))); |
|
EXPECT_THAT(MultiplyU128ToU256( |
|
absl::MakeUint128(0xb5c04120848cdb47, 0x8aa62a827bf52635), |
|
absl::MakeUint128(0x8d07a359be2f1380, 0x467bb90d59da0dea)), |
|
Eq256(absl::MakeUint128(0x64205019d139a9ce, 0x99425c5fb6e7a977), |
|
absl::MakeUint128(0xd3e99628a9e5fca7, 0x9c7824cb7279d72))); |
|
} |
|
|
|
} // namespace
|
|
|