Export of internal Abseil changes

--
2c5c118f0615ba90e48ee2f18eccc9f511740f6d by Samuel Benzaquen <sbenza@google.com>:

Rename internal macros to follow the convention in absl.

PiperOrigin-RevId: 299906738

--
92d84a707c7ebc4ec19bdd92d5765d1b6d218c1e by Derek Mauro <dmauro@google.com>:

Import GitHub #629: Skip the .exe suffix in the helpshort filter on Windows

PiperOrigin-RevId: 299892396

--
2a6910d4be6c67a8376628764121b528ff53504d by Abseil Team <absl-team@google.com>:

Use unsigned int128 intrinsic when available. It generates better branchless code.

PiperOrigin-RevId: 299848585

--
110c16cf0a739e1df5028fb6fbd03ef5dde1d278 by Derek Mauro <dmauro@google.com>:

Import GitHub #594: Avoid reading the registry for Windows UWP apps

PiperOrigin-RevId: 299821671

--
d8397d367e88163e5e8a47f379c716352dc91d03 by Greg Falcon <gfalcon@google.com>:

Add absl::Hash support for Cord.  The hash function is heterogeneous with other string types: a Cord and a string with the same byte sequence will hash to the same value.

SwissTable types know about Cord, and will allow heterogeneous lookup (e.g., you can pass a Cord to flat_hash_map<string, T>::find(), and vice versa.)

Add a missing dependency to the cmake Cord target.

PiperOrigin-RevId: 299443713
GitOrigin-RevId: 2c5c118f0615ba90e48ee2f18eccc9f511740f6d
Change-Id: I7b087c7984b0cb52c4b337d49266c467b98ebdf9

absl/base/internal/sysinfo.cc

@@ -72,10 +72,10 @@ static int GetNumCPUs() {
 #if defined(_WIN32)
 
 static double GetNominalCPUFrequency() {
-// UWP apps don't have access to the registry and currently don't provide an
-// API informing about CPU nominal frequency.
 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
     !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+  // UWP apps don't have access to the registry and currently don't provide an
+  // API informing about CPU nominal frequency.
   return 1.0;
 #else
 #pragma comment(lib, "advapi32.lib")  // For Reg* functions.

absl/container/BUILD.bazel

@@ -390,6 +390,7 @@ cc_library(
         "//absl/base:config",
         "//absl/hash",
         "//absl/strings",
+        "//absl/strings:cord",
     ],
 )
 
@@ -402,7 +403,10 @@ cc_test(
     deps = [
         ":hash_function_defaults",
         "//absl/hash",
+        "//absl/random",
         "//absl/strings",
+        "//absl/strings:cord",
+        "//absl/strings:cord_test_helpers",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -828,6 +832,7 @@ cc_library(
         "//absl/memory",
         "//absl/meta:type_traits",
         "//absl/strings",
+        "//absl/strings:cord",
         "//absl/types:compare",
         "//absl/utility",
     ],
@@ -844,6 +849,7 @@ cc_library(
         ":btree",
         ":flat_hash_set",
         "//absl/strings",
+        "//absl/strings:cord",
         "//absl/time",
     ],
 )
@@ -895,6 +901,7 @@ cc_binary(
         "//absl/flags:flag",
         "//absl/hash",
         "//absl/memory",
+        "//absl/strings:cord",
         "//absl/strings:str_format",
         "//absl/time",
         "@com_github_google_benchmark//:benchmark_main",

absl/container/CMakeLists.txt

@@ -40,6 +40,7 @@ absl_cc_library(
     absl::compare
     absl::compressed_tuple
     absl::container_memory
+    absl::cord
     absl::core_headers
     absl::layout
     absl::memory
@@ -60,6 +61,7 @@ absl_cc_library(
     ${ABSL_DEFAULT_LINKOPTS}
   DEPS
     absl::btree
+    absl::cord
     absl::flat_hash_set
     absl::strings
     absl::time
@@ -443,6 +445,7 @@ absl_cc_library(
     ${ABSL_DEFAULT_COPTS}
   DEPS
     absl::config
+    absl::cord
     absl::hash
     absl::strings
   PUBLIC
@@ -456,8 +459,11 @@ absl_cc_test(
   COPTS
     ${ABSL_TEST_COPTS}
   DEPS
+    absl::cord
+    absl::cord_test_helpers
     absl::hash_function_defaults
     absl::hash
+    absl::random_random
     absl::strings
     gmock_main
 )

absl/container/btree_benchmark.cc

@@ -36,6 +36,7 @@
 #include "absl/flags/flag.h"
 #include "absl/hash/hash.h"
 #include "absl/memory/memory.h"
+#include "absl/strings/cord.h"
 #include "absl/strings/str_format.h"
 #include "absl/time/time.h"
 #include "benchmark/benchmark.h"
@@ -438,6 +439,7 @@ using StdString = std::string;
 STL_ORDERED_TYPES(int32_t);
 STL_ORDERED_TYPES(int64_t);
 STL_ORDERED_TYPES(StdString);
+STL_ORDERED_TYPES(Cord);
 STL_ORDERED_TYPES(Time);
 
 #define STL_UNORDERED_TYPES(value)                                       \
@@ -458,6 +460,8 @@ STL_ORDERED_TYPES(Time);
   using stl_unordered_multimap_##value =                                       \
       std::unordered_multimap<value, intptr_t, hash>
 
+STL_UNORDERED_TYPES_CUSTOM_HASH(Cord, absl::Hash<absl::Cord>);
+
 STL_UNORDERED_TYPES(int32_t);
 STL_UNORDERED_TYPES(int64_t);
 STL_UNORDERED_TYPES(StdString);
@@ -478,6 +482,7 @@ STL_UNORDERED_TYPES_CUSTOM_HASH(Time, absl::Hash<absl::Time>);
 BTREE_TYPES(int32_t);
 BTREE_TYPES(int64_t);
 BTREE_TYPES(StdString);
+BTREE_TYPES(Cord);
 BTREE_TYPES(Time);
 
 #define MY_BENCHMARK4(type, func)                                              \
@@ -526,6 +531,7 @@ BTREE_TYPES(Time);
 MY_BENCHMARK(int32_t);
 MY_BENCHMARK(int64_t);
 MY_BENCHMARK(StdString);
+MY_BENCHMARK(Cord);
 MY_BENCHMARK(Time);
 
 // Define a type whose size and cost of moving are independently customizable.

absl/container/btree_test.cc

@@ -812,10 +812,12 @@ void MapTest() {
 TEST(Btree, set_int32) { SetTest<int32_t>(); }
 TEST(Btree, set_int64) { SetTest<int64_t>(); }
 TEST(Btree, set_string) { SetTest<std::string>(); }
+TEST(Btree, set_cord) { SetTest<absl::Cord>(); }
 TEST(Btree, set_pair) { SetTest<std::pair<int, int>>(); }
 TEST(Btree, map_int32) { MapTest<int32_t>(); }
 TEST(Btree, map_int64) { MapTest<int64_t>(); }
 TEST(Btree, map_string) { MapTest<std::string>(); }
+TEST(Btree, map_cord) { MapTest<absl::Cord>(); }
 TEST(Btree, map_pair) { MapTest<std::pair<int, int>>(); }
 
 template <typename K, int N = 256>
@@ -847,10 +849,12 @@ void MultiMapTest() {
 TEST(Btree, multiset_int32) { MultiSetTest<int32_t>(); }
 TEST(Btree, multiset_int64) { MultiSetTest<int64_t>(); }
 TEST(Btree, multiset_string) { MultiSetTest<std::string>(); }
+TEST(Btree, multiset_cord) { MultiSetTest<absl::Cord>(); }
 TEST(Btree, multiset_pair) { MultiSetTest<std::pair<int, int>>(); }
 TEST(Btree, multimap_int32) { MultiMapTest<int32_t>(); }
 TEST(Btree, multimap_int64) { MultiMapTest<int64_t>(); }
 TEST(Btree, multimap_string) { MultiMapTest<std::string>(); }
+TEST(Btree, multimap_cord) { MultiMapTest<absl::Cord>(); }
 TEST(Btree, multimap_pair) { MultiMapTest<std::pair<int, int>>(); }
 
 struct CompareIntToString {
@@ -1268,6 +1272,8 @@ TEST(Btree, KeyCompareToAdapter) {
   AssertKeyCompareToAdapted<std::less<absl::string_view>, absl::string_view>();
   AssertKeyCompareToAdapted<std::greater<absl::string_view>,
                             absl::string_view>();
+  AssertKeyCompareToAdapted<std::less<absl::Cord>, absl::Cord>();
+  AssertKeyCompareToAdapted<std::greater<absl::Cord>, absl::Cord>();
   AssertKeyCompareToNotAdapted<std::less<int>, int>();
   AssertKeyCompareToNotAdapted<std::greater<int>, int>();
 }

absl/container/btree_test.h

@@ -25,6 +25,7 @@
 #include "absl/container/btree_map.h"
 #include "absl/container/btree_set.h"
 #include "absl/container/flat_hash_set.h"
+#include "absl/strings/cord.h"
 #include "absl/time/time.h"
 
 namespace absl {
@@ -100,6 +101,16 @@ struct Generator<std::string> {
   }
 };
 
+template <>
+struct Generator<Cord> {
+  int maxval;
+  explicit Generator(int m) : maxval(m) {}
+  Cord operator()(int i) const {
+    char buf[16];
+    return Cord(GenerateDigits(buf, i, maxval));
+  }
+};
+
 template <typename T, typename U>
 struct Generator<std::pair<T, U> > {
   Generator<typename remove_pair_const<T>::type> tgen;

absl/container/internal/btree.h

@@ -65,6 +65,7 @@
 #include "absl/container/internal/layout.h"
 #include "absl/memory/memory.h"
 #include "absl/meta/type_traits.h"
+#include "absl/strings/cord.h"
 #include "absl/strings/string_view.h"
 #include "absl/types/compare.h"
 #include "absl/utility/utility.h"
@@ -93,6 +94,19 @@ struct StringBtreeDefaultLess {
                                  absl::string_view rhs) const {
     return compare_internal::compare_result_as_ordering(lhs.compare(rhs));
   }
+  StringBtreeDefaultLess(std::less<absl::Cord>) {}  // NOLINT
+  absl::weak_ordering operator()(const absl::Cord &lhs,
+                                 const absl::Cord &rhs) const {
+    return compare_internal::compare_result_as_ordering(lhs.Compare(rhs));
+  }
+  absl::weak_ordering operator()(const absl::Cord &lhs,
+                                 absl::string_view rhs) const {
+    return compare_internal::compare_result_as_ordering(lhs.Compare(rhs));
+  }
+  absl::weak_ordering operator()(absl::string_view lhs,
+                                 const absl::Cord &rhs) const {
+    return compare_internal::compare_result_as_ordering(-rhs.Compare(lhs));
+  }
 };
 
 struct StringBtreeDefaultGreater {
@@ -107,13 +121,27 @@ struct StringBtreeDefaultGreater {
                                  absl::string_view rhs) const {
     return compare_internal::compare_result_as_ordering(rhs.compare(lhs));
   }
+  StringBtreeDefaultGreater(std::greater<absl::Cord>) {}  // NOLINT
+  absl::weak_ordering operator()(const absl::Cord &lhs,
+                                 const absl::Cord &rhs) const {
+    return compare_internal::compare_result_as_ordering(rhs.Compare(lhs));
+  }
+  absl::weak_ordering operator()(const absl::Cord &lhs,
+                                 absl::string_view rhs) const {
+    return compare_internal::compare_result_as_ordering(-lhs.Compare(rhs));
+  }
+  absl::weak_ordering operator()(absl::string_view lhs,
+                                 const absl::Cord &rhs) const {
+    return compare_internal::compare_result_as_ordering(rhs.Compare(lhs));
+  }
 };
 
 // A helper class to convert a boolean comparison into a three-way "compare-to"
 // comparison that returns a negative value to indicate less-than, zero to
 // indicate equality and a positive value to indicate greater-than. This helper
 // class is specialized for less<std::string>, greater<std::string>,
-// less<string_view>, and greater<string_view>.
+// less<string_view>, greater<string_view>, less<absl::Cord>, and
+// greater<absl::Cord>.
 //
 // key_compare_to_adapter is provided so that btree users
 // automatically get the more efficient compare-to code when using common
@@ -145,6 +173,16 @@ struct key_compare_to_adapter<std::greater<absl::string_view>> {
   using type = StringBtreeDefaultGreater;
 };
 
+template <>
+struct key_compare_to_adapter<std::less<absl::Cord>> {
+  using type = StringBtreeDefaultLess;
+};
+
+template <>
+struct key_compare_to_adapter<std::greater<absl::Cord>> {
+  using type = StringBtreeDefaultGreater;
+};
+
 template <typename Key, typename Compare, typename Alloc, int TargetNodeSize,
           bool Multi, typename SlotPolicy>
 struct common_params {

absl/container/internal/hash_function_defaults.h

@@ -53,6 +53,7 @@
 
 #include "absl/base/config.h"
 #include "absl/hash/hash.h"
+#include "absl/strings/cord.h"
 #include "absl/strings/string_view.h"
 
 namespace absl {
@@ -72,6 +73,9 @@ struct StringHash {
   size_t operator()(absl::string_view v) const {
     return absl::Hash<absl::string_view>{}(v);
   }
+  size_t operator()(const absl::Cord& v) const {
+    return absl::Hash<absl::Cord>{}(v);
+  }
 };
 
 // Supports heterogeneous lookup for string-like elements.
@@ -82,6 +86,15 @@ struct StringHashEq {
     bool operator()(absl::string_view lhs, absl::string_view rhs) const {
       return lhs == rhs;
     }
+    bool operator()(const absl::Cord& lhs, const absl::Cord& rhs) const {
+      return lhs == rhs;
+    }
+    bool operator()(const absl::Cord& lhs, absl::string_view rhs) const {
+      return lhs == rhs;
+    }
+    bool operator()(absl::string_view lhs, const absl::Cord& rhs) const {
+      return lhs == rhs;
+    }
   };
 };
 
@@ -89,6 +102,8 @@ template <>
 struct HashEq<std::string> : StringHashEq {};
 template <>
 struct HashEq<absl::string_view> : StringHashEq {};
+template <>
+struct HashEq<absl::Cord> : StringHashEq {};
 
 // Supports heterogeneous lookup for pointers and smart pointers.
 template <class T>

absl/container/internal/hash_function_defaults_test.cc

@@ -19,6 +19,9 @@
 #include <utility>
 
 #include "gtest/gtest.h"
+#include "absl/random/random.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/cord_test_helpers.h"
 #include "absl/strings/string_view.h"
 
 namespace absl {
@@ -203,10 +206,91 @@ TYPED_TEST(HashPointer, Works) {
   EXPECT_NE(hash(&dummy), hash(cuptr));
 }
 
+TEST(EqCord, Works) {
+  hash_default_eq<absl::Cord> eq;
+  const absl::string_view a_string_view = "a";
+  const absl::Cord a_cord(a_string_view);
+  const absl::string_view b_string_view = "b";
+  const absl::Cord b_cord(b_string_view);
+
+  EXPECT_TRUE(eq(a_cord, a_cord));
+  EXPECT_TRUE(eq(a_cord, a_string_view));
+  EXPECT_TRUE(eq(a_string_view, a_cord));
+  EXPECT_FALSE(eq(a_cord, b_cord));
+  EXPECT_FALSE(eq(a_cord, b_string_view));
+  EXPECT_FALSE(eq(b_string_view, a_cord));
+}
+
+TEST(HashCord, Works) {
+  hash_default_hash<absl::Cord> hash;
+  const absl::string_view a_string_view = "a";
+  const absl::Cord a_cord(a_string_view);
+  const absl::string_view b_string_view = "b";
+  const absl::Cord b_cord(b_string_view);
+
+  EXPECT_EQ(hash(a_cord), hash(a_cord));
+  EXPECT_EQ(hash(b_cord), hash(b_cord));
+  EXPECT_EQ(hash(a_string_view), hash(a_cord));
+  EXPECT_EQ(hash(b_string_view), hash(b_cord));
+  EXPECT_EQ(hash(absl::Cord("")), hash(""));
+  EXPECT_EQ(hash(absl::Cord()), hash(absl::string_view()));
+
+  EXPECT_NE(hash(a_cord), hash(b_cord));
+  EXPECT_NE(hash(a_cord), hash(b_string_view));
+  EXPECT_NE(hash(a_string_view), hash(b_cord));
+  EXPECT_NE(hash(a_string_view), hash(b_string_view));
+}
+
+void NoOpReleaser(absl::string_view data, void* arg) {}
+
+TEST(HashCord, FragmentedCordWorks) {
+  hash_default_hash<absl::Cord> hash;
+  absl::Cord c = absl::MakeFragmentedCord({"a", "b", "c"});
+  EXPECT_FALSE(c.TryFlat().has_value());
+  EXPECT_EQ(hash(c), hash("abc"));
+}
+
+TEST(HashCord, FragmentedLongCordWorks) {
+  hash_default_hash<absl::Cord> hash;
+  // Crete some large strings which do not fit on the stack.
+  std::string a(65536, 'a');
+  std::string b(65536, 'b');
+  absl::Cord c = absl::MakeFragmentedCord({a, b});
+  EXPECT_FALSE(c.TryFlat().has_value());
+  EXPECT_EQ(hash(c), hash(a + b));
+}
+
+TEST(HashCord, RandomCord) {
+  hash_default_hash<absl::Cord> hash;
+  auto bitgen = absl::BitGen();
+  for (int i = 0; i < 1000; ++i) {
+    const int number_of_segments = absl::Uniform(bitgen, 0, 10);
+    std::vector<std::string> pieces;
+    for (size_t s = 0; s < number_of_segments; ++s) {
+      std::string str;
+      str.resize(absl::Uniform(bitgen, 0, 4096));
+      // MSVC needed the explicit return type in the lambda.
+      std::generate(str.begin(), str.end(), [&]() -> char {
+        return static_cast<char>(absl::Uniform<unsigned char>(bitgen));
+      });
+      pieces.push_back(str);
+    }
+    absl::Cord c = absl::MakeFragmentedCord(pieces);
+    EXPECT_EQ(hash(c), hash(std::string(c)));
+  }
+}
+
 // Cartesian product of (std::string, absl::string_view)
-// with (std::string, absl::string_view, const char*).
+// with (std::string, absl::string_view, const char*, absl::Cord).
 using StringTypesCartesianProduct = Types<
     // clang-format off
+    std::pair<absl::Cord, std::string>,
+    std::pair<absl::Cord, absl::string_view>,
+    std::pair<absl::Cord, absl::Cord>,
+    std::pair<absl::Cord, const char*>,
+
+    std::pair<std::string, absl::Cord>,
+    std::pair<absl::string_view, absl::Cord>,
 
     std::pair<absl::string_view, std::string>,
     std::pair<absl::string_view, absl::string_view>,

absl/container/internal/hashtablez_sampler.cc

@@ -226,7 +226,7 @@ void RecordInsertSlow(HashtablezInfo* info, size_t hash,
   // SwissTables probe in groups of 16, so scale this to count items probes and
   // not offset from desired.
   size_t probe_length = distance_from_desired;
-#if SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
   probe_length /= 16;
 #else
   probe_length /= 8;

absl/container/internal/hashtablez_sampler.h

@@ -98,7 +98,7 @@ struct HashtablezInfo {
 };
 
 inline void RecordRehashSlow(HashtablezInfo* info, size_t total_probe_length) {
-#if SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
   total_probe_length /= 16;
 #else
   total_probe_length /= 8;

absl/container/internal/hashtablez_sampler_test.cc

@@ -29,7 +29,7 @@
 #include "absl/time/clock.h"
 #include "absl/time/time.h"
 
-#if SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 constexpr int kProbeLength = 16;
 #else
 constexpr int kProbeLength = 8;

absl/container/internal/have_sse.h

@@ -16,33 +16,34 @@
 #ifndef ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_
 #define ABSL_CONTAINER_INTERNAL_HAVE_SSE_H_
 
-#ifndef SWISSTABLE_HAVE_SSE2
+#ifndef ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 #if defined(__SSE2__) ||  \
     (defined(_MSC_VER) && \
      (defined(_M_X64) || (defined(_M_IX86) && _M_IX86_FP >= 2)))
-#define SWISSTABLE_HAVE_SSE2 1
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 1
 #else
-#define SWISSTABLE_HAVE_SSE2 0
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2 0
 #endif
 #endif
 
-#ifndef SWISSTABLE_HAVE_SSSE3
+#ifndef ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
 #ifdef __SSSE3__
-#define SWISSTABLE_HAVE_SSSE3 1
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 1
 #else
-#define SWISSTABLE_HAVE_SSSE3 0
+#define ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 0
 #endif
 #endif
 
-#if SWISSTABLE_HAVE_SSSE3 && !SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3 && \
+    !ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 #error "Bad configuration!"
 #endif
 
-#if SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 #include <emmintrin.h>
 #endif
 
-#if SWISSTABLE_HAVE_SSSE3
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
 #include <tmmintrin.h>
 #endif
 

absl/container/internal/raw_hash_set.h

@@ -312,7 +312,7 @@ inline bool IsFull(ctrl_t c) { return c >= 0; }
 inline bool IsDeleted(ctrl_t c) { return c == kDeleted; }
 inline bool IsEmptyOrDeleted(ctrl_t c) { return c < kSentinel; }
 
-#if SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 
 // https://github.com/abseil/abseil-cpp/issues/209
 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87853
@@ -346,7 +346,7 @@ struct GroupSse2Impl {
 
   // Returns a bitmask representing the positions of empty slots.
   BitMask<uint32_t, kWidth> MatchEmpty() const {
-#if SWISSTABLE_HAVE_SSSE3
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
     // This only works because kEmpty is -128.
     return BitMask<uint32_t, kWidth>(
         _mm_movemask_epi8(_mm_sign_epi8(ctrl, ctrl)));
@@ -372,7 +372,7 @@ struct GroupSse2Impl {
   void ConvertSpecialToEmptyAndFullToDeleted(ctrl_t* dst) const {
     auto msbs = _mm_set1_epi8(static_cast<char>(-128));
     auto x126 = _mm_set1_epi8(126);
-#if SWISSTABLE_HAVE_SSSE3
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSSE3
     auto res = _mm_or_si128(_mm_shuffle_epi8(x126, ctrl), msbs);
 #else
     auto zero = _mm_setzero_si128();
@@ -384,7 +384,7 @@ struct GroupSse2Impl {
 
   __m128i ctrl;
 };
-#endif  // SWISSTABLE_HAVE_SSE2
+#endif  // ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 
 struct GroupPortableImpl {
   static constexpr size_t kWidth = 8;
@@ -438,7 +438,7 @@ struct GroupPortableImpl {
   uint64_t ctrl;
 };
 
-#if SWISSTABLE_HAVE_SSE2
+#if ABSL_INTERNAL_RAW_HASH_SET_HAVE_SSE2
 using Group = GroupSse2Impl;
 #else
 using Group = GroupPortableImpl;

absl/hash/BUILD.bazel

@@ -43,6 +43,7 @@ cc_library(
         "//absl/meta:type_traits",
         "//absl/numeric:int128",
         "//absl/strings",
+        "//absl/strings:cord",
         "//absl/types:optional",
         "//absl/types:variant",
         "//absl/utility",
@@ -76,6 +77,7 @@ cc_test(
         "//absl/container:flat_hash_set",
         "//absl/meta:type_traits",
         "//absl/numeric:int128",
+        "//absl/strings:cord_test_helpers",
         "@com_google_googletest//:gtest_main",
     ],
 )

absl/hash/CMakeLists.txt

@@ -25,6 +25,7 @@ absl_cc_library(
   COPTS
     ${ABSL_DEFAULT_COPTS}
   DEPS
+    absl::cord
     absl::core_headers
     absl::endian
     absl::fixed_array
@@ -62,6 +63,7 @@ absl_cc_test(
   COPTS
     ${ABSL_TEST_COPTS}
   DEPS
+    absl::cord_test_helpers
     absl::hash
     absl::hash_testing
     absl::core_headers

absl/hash/hash.h

@@ -98,6 +98,7 @@ ABSL_NAMESPACE_BEGIN
 //   * std::tuple<Ts...>, if all the Ts... are hashable
 //   * std::unique_ptr and std::shared_ptr
 //   * All string-like types including:
+//     * absl::Cord
 //     * std::string
 //     * std::string_view (as well as any instance of std::basic_string that
 //       uses char and std::char_traits)

absl/hash/hash_test.cc

@@ -42,6 +42,7 @@
 #include "absl/hash/internal/spy_hash_state.h"
 #include "absl/meta/type_traits.h"
 #include "absl/numeric/int128.h"
+#include "absl/strings/cord_test_helpers.h"
 
 namespace {
 
@@ -269,6 +270,22 @@ struct WrapInTuple {
   }
 };
 
+absl::Cord FlatCord(absl::string_view sv) {
+  absl::Cord c(sv);
+  c.Flatten();
+  return c;
+}
+
+absl::Cord FragmentedCord(absl::string_view sv) {
+  if (sv.size() < 2) {
+    return absl::Cord(sv);
+  }
+  size_t halfway = sv.size() / 2;
+  std::vector<absl::string_view> parts = {sv.substr(0, halfway),
+                                          sv.substr(halfway)};
+  return absl::MakeFragmentedCord(parts);
+}
+
 TEST(HashValueTest, Strings) {
   EXPECT_TRUE((is_hashable<std::string>::value));
 
@@ -277,23 +294,27 @@ TEST(HashValueTest, Strings) {
   const std::string large = std::string(2048, 'x');  // multiple of chunk size
   const std::string huge = std::string(5000, 'a');   // not a multiple
 
-  EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
-      std::string(), absl::string_view(),
-      std::string(""), absl::string_view(""),
-      std::string(small), absl::string_view(small),
-      std::string(dup), absl::string_view(dup),
-      std::string(large), absl::string_view(large),
-      std::string(huge), absl::string_view(huge))));
+  EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(  //
+      std::string(), absl::string_view(), absl::Cord(),                     //
+      std::string(""), absl::string_view(""), absl::Cord(""),               //
+      std::string(small), absl::string_view(small), absl::Cord(small),      //
+      std::string(dup), absl::string_view(dup), absl::Cord(dup),            //
+      std::string(large), absl::string_view(large), absl::Cord(large),      //
+      std::string(huge), absl::string_view(huge), FlatCord(huge),           //
+      FragmentedCord(huge))));
 
   // Also check that nested types maintain the same hash.
   const WrapInTuple t{};
-  EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(
-      t(std::string()), t(absl::string_view()),
-      t(std::string("")), t(absl::string_view("")),
-      t(std::string(small)), t(absl::string_view(small)),
-      t(std::string(dup)), t(absl::string_view(dup)),
-      t(std::string(large)), t(absl::string_view(large)),
-      t(std::string(huge)), t(absl::string_view(huge)))));
+  EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(std::make_tuple(  //
+      t(std::string()), t(absl::string_view()), t(absl::Cord()),            //
+      t(std::string("")), t(absl::string_view("")), t(absl::Cord("")),      //
+      t(std::string(small)), t(absl::string_view(small)),                   //
+          t(absl::Cord(small)),                                             //
+      t(std::string(dup)), t(absl::string_view(dup)), t(absl::Cord(dup)),   //
+      t(std::string(large)), t(absl::string_view(large)),                   //
+          t(absl::Cord(large)),                                             //
+      t(std::string(huge)), t(absl::string_view(huge)),                     //
+          t(FlatCord(huge)), t(FragmentedCord(huge)))));
 
   // Make sure that hashing a `const char*` does not use its std::string-value.
   EXPECT_NE(SpyHash(static_cast<const char*>("ABC")),

absl/hash/internal/hash.h

@@ -43,6 +43,7 @@
 #include "absl/container/fixed_array.h"
 #include "absl/meta/type_traits.h"
 #include "absl/numeric/int128.h"
+#include "absl/strings/cord.h"
 #include "absl/strings/string_view.h"
 #include "absl/types/optional.h"
 #include "absl/types/variant.h"
@@ -413,6 +414,7 @@ H AbslHashValue(H hash_state, const std::shared_ptr<T>& ptr) {
 // All the string-like types supported here provide the same hash expansion for
 // the same character sequence. These types are:
 //
+//  - `absl::Cord`
 //  - `std::string` (and std::basic_string<char, std::char_traits<char>, A> for
 //      any allocator A)
 //  - `absl::string_view` and `std::string_view`
@@ -441,6 +443,25 @@ H AbslHashValue(
       str.size());
 }
 
+template <typename H>
+H HashFragmentedCord(H hash_state, const absl::Cord& c) {
+  PiecewiseCombiner combiner;
+  c.ForEachChunk([&combiner, &hash_state](absl::string_view chunk) {
+    hash_state =
+        combiner.add_buffer(std::move(hash_state), chunk.data(), chunk.size());
+  });
+  return H::combine(combiner.finalize(std::move(hash_state)), c.size());
+}
+
+template <typename H>
+H AbslHashValue(H hash_state, const absl::Cord& c) {
+  absl::optional<absl::string_view> maybe_flat = c.TryFlat();
+  if (maybe_flat.has_value()) {
+    return H::combine(std::move(hash_state), *maybe_flat);
+  }
+  return hash_internal::HashFragmentedCord(std::move(hash_state), c);
+}
+
 // -----------------------------------------------------------------------------
 // AbslHashValue for Sequence Containers
 // -----------------------------------------------------------------------------

absl/numeric/int128.h

@@ -792,28 +792,21 @@ inline bool operator!=(uint128 lhs, uint128 rhs) {
 }
 
 inline bool operator<(uint128 lhs, uint128 rhs) {
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+  return static_cast<unsigned __int128>(lhs) <
+         static_cast<unsigned __int128>(rhs);
+#else
   return (Uint128High64(lhs) == Uint128High64(rhs))
              ? (Uint128Low64(lhs) < Uint128Low64(rhs))
              : (Uint128High64(lhs) < Uint128High64(rhs));
+#endif
 }
 
-inline bool operator>(uint128 lhs, uint128 rhs) {
-  return (Uint128High64(lhs) == Uint128High64(rhs))
-             ? (Uint128Low64(lhs) > Uint128Low64(rhs))
-             : (Uint128High64(lhs) > Uint128High64(rhs));
-}
+inline bool operator>(uint128 lhs, uint128 rhs) { return rhs < lhs; }
 
-inline bool operator<=(uint128 lhs, uint128 rhs) {
-  return (Uint128High64(lhs) == Uint128High64(rhs))
-             ? (Uint128Low64(lhs) <= Uint128Low64(rhs))
-             : (Uint128High64(lhs) <= Uint128High64(rhs));
-}
+inline bool operator<=(uint128 lhs, uint128 rhs) { return !(rhs < lhs); }
 
-inline bool operator>=(uint128 lhs, uint128 rhs) {
-  return (Uint128High64(lhs) == Uint128High64(rhs))
-             ? (Uint128Low64(lhs) >= Uint128Low64(rhs))
-             : (Uint128High64(lhs) >= Uint128High64(rhs));
-}
+inline bool operator>=(uint128 lhs, uint128 rhs) { return !(lhs < rhs); }
 
 // Unary operators.
 
@@ -870,6 +863,9 @@ inline uint128& uint128::operator^=(uint128 other) {
 // Arithmetic operators.
 
 inline uint128 operator<<(uint128 lhs, int amount) {
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+  return static_cast<unsigned __int128>(lhs) << amount;
+#else
   // uint64_t shifts of >= 64 are undefined, so we will need some
   // special-casing.
   if (amount < 64) {
@@ -881,9 +877,13 @@ inline uint128 operator<<(uint128 lhs, int amount) {
     return lhs;
   }
   return MakeUint128(Uint128Low64(lhs) << (amount - 64), 0);
+#endif
 }
 
 inline uint128 operator>>(uint128 lhs, int amount) {
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+  return static_cast<unsigned __int128>(lhs) >> amount;
+#else
   // uint64_t shifts of >= 64 are undefined, so we will need some
   // special-casing.
   if (amount < 64) {
@@ -895,6 +895,7 @@ inline uint128 operator>>(uint128 lhs, int amount) {
     return lhs;
   }
   return MakeUint128(0, Uint128High64(lhs) >> (amount - 64));
+#endif
 }
 
 inline uint128 operator+(uint128 lhs, uint128 rhs) {

absl/strings/CMakeLists.txt

@@ -548,6 +548,7 @@ absl_cc_library(
     absl::inlined_vector
     absl::optional
     absl::raw_logging_internal
+    absl::strings
     absl::type_traits
   PUBLIC
 )