From 5aa5d282eac56a21e74611c1cdbaa97bb5db2dca Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Tue, 8 Feb 2022 02:05:36 +0300 Subject: chore(3p/abseil_cpp): unvendor abseil_cpp we weren't actually using these sources anymore, okay? Change-Id: If701571d9716de308d3512e1eb22c35db0877a66 Reviewed-on: https://cl.tvl.fyi/c/depot/+/5248 Tested-by: BuildkiteCI Reviewed-by: grfn Autosubmit: tazjin --- .../absl/random/internal/fastmath_test.cc | 110 --------------------- 1 file changed, 110 deletions(-) delete mode 100644 third_party/abseil_cpp/absl/random/internal/fastmath_test.cc (limited to 'third_party/abseil_cpp/absl/random/internal/fastmath_test.cc') diff --git a/third_party/abseil_cpp/absl/random/internal/fastmath_test.cc b/third_party/abseil_cpp/absl/random/internal/fastmath_test.cc deleted file mode 100644 index 65859c25de4c..000000000000 --- a/third_party/abseil_cpp/absl/random/internal/fastmath_test.cc +++ /dev/null @@ -1,110 +0,0 @@ -// 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/fastmath.h" - -#include "gtest/gtest.h" - -#if defined(__native_client__) || defined(__EMSCRIPTEN__) -// NACL has a less accurate implementation of std::log2 than most of -// the other platforms. For some values which should have integral results, -// sometimes NACL returns slightly larger values. -// -// The MUSL libc used by emscripten also has a similar bug. -#define ABSL_RANDOM_INACCURATE_LOG2 -#endif - -namespace { - -TEST(DistributionImplTest, LeadingSetBit) { - using absl::random_internal::LeadingSetBit; - constexpr uint64_t kZero = 0; - EXPECT_EQ(0, LeadingSetBit(kZero)); - EXPECT_EQ(64, LeadingSetBit(~kZero)); - - for (int index = 0; index < 64; index++) { - uint64_t x = static_cast(1) << index; - EXPECT_EQ(index + 1, LeadingSetBit(x)) << index; - EXPECT_EQ(index + 1, LeadingSetBit(x + x - 1)) << index; - } -} - -TEST(FastMathTest, IntLog2FloorTest) { - using absl::random_internal::IntLog2Floor; - constexpr uint64_t kZero = 0; - EXPECT_EQ(0, IntLog2Floor(0)); // boundary. return 0. - EXPECT_EQ(0, IntLog2Floor(1)); - EXPECT_EQ(1, IntLog2Floor(2)); - EXPECT_EQ(63, IntLog2Floor(~kZero)); - - // A boundary case: Converting 0xffffffffffffffff requires > 53 - // bits of precision, so the conversion to double rounds up, - // and the result of std::log2(x) > IntLog2Floor(x). - EXPECT_LT(IntLog2Floor(~kZero), static_cast(std::log2(~kZero))); - - for (int i = 0; i < 64; i++) { - const uint64_t i_pow_2 = static_cast(1) << i; - EXPECT_EQ(i, IntLog2Floor(i_pow_2)); - EXPECT_EQ(i, static_cast(std::log2(i_pow_2))); - - uint64_t y = i_pow_2; - for (int j = i - 1; j > 0; --j) { - y = y | (i_pow_2 >> j); - EXPECT_EQ(i, IntLog2Floor(y)); - } - } -} - -TEST(FastMathTest, IntLog2CeilTest) { - using absl::random_internal::IntLog2Ceil; - constexpr uint64_t kZero = 0; - EXPECT_EQ(0, IntLog2Ceil(0)); // boundary. return 0. - EXPECT_EQ(0, IntLog2Ceil(1)); - EXPECT_EQ(1, IntLog2Ceil(2)); - EXPECT_EQ(64, IntLog2Ceil(~kZero)); - - // A boundary case: Converting 0xffffffffffffffff requires > 53 - // bits of precision, so the conversion to double rounds up, - // and the result of std::log2(x) > IntLog2Floor(x). - EXPECT_LE(IntLog2Ceil(~kZero), static_cast(std::log2(~kZero))); - - for (int i = 0; i < 64; i++) { - const uint64_t i_pow_2 = static_cast(1) << i; - EXPECT_EQ(i, IntLog2Ceil(i_pow_2)); -#ifndef ABSL_RANDOM_INACCURATE_LOG2 - EXPECT_EQ(i, static_cast(std::ceil(std::log2(i_pow_2)))); -#endif - - uint64_t y = i_pow_2; - for (int j = i - 1; j > 0; --j) { - y = y | (i_pow_2 >> j); - EXPECT_EQ(i + 1, IntLog2Ceil(y)); - } - } -} - -TEST(FastMathTest, StirlingLogFactorial) { - using absl::random_internal::StirlingLogFactorial; - - EXPECT_NEAR(StirlingLogFactorial(1.0), 0, 1e-3); - EXPECT_NEAR(StirlingLogFactorial(1.50), 0.284683, 1e-3); - EXPECT_NEAR(StirlingLogFactorial(2.0), 0.69314718056, 1e-4); - - for (int i = 2; i < 50; i++) { - double d = static_cast(i); - EXPECT_NEAR(StirlingLogFactorial(d), std::lgamma(d + 1), 3e-5); - } -} - -} // namespace -- cgit 1.4.1