Creation of LTS branch "lts_2019_08_08"20190808

  - 9ee91d3e430fb33a4590486573792eb0fa146c2d Export of internal Abseil changes by Abseil Team <absl-team@google.com>
  - 8efba58a3b656e9b41fb0471ae6453425a61c520 Export of internal Abseil changes by Abseil Team <absl-team@google.com>
  - b49b8d16b67ec6912899684b732e6367f258cfdb Export of internal Abseil changes by Abseil Team <absl-team@google.com>
  - 67222ffc4c83d918ce8395aa61769eeb77df4c4d Export of internal Abseil changes by Abseil Team <absl-team@google.com>
  - c5c4db4f5191fe5e76cbf68dcc71fb28702f7d2b Export of internal Abseil changes by Abseil Team <absl-team@google.com>
  - 14550beb3b7b97195e483fb74b5efb906395c31e Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 52e88ee56b72cf32bc66534d942c7398ce481331 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 36d37ab992038f52276ca66b9da80c1cf0f57dc2 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - ad1485c8986246b2ae9105e512738d0e97aec887 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - f3840bc5e33ce4932e35986cf3718450c6f02af2 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 278b26058c036833a4f7f3047d3f4d9296527f87 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - c6c3c1b498e4ee939b24be59cae29d59c3863be8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 44efe96dfca674a17b45ca53fc77fb69f1e29bf4 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 3c98fcc0461bd2a4b9c149d4748a7373a225cf4b Merge pull request #340 from jtsylve/macos_cxx17_fix by Matt Calabrese <38107210+mattcalabrese-google@users.noreply.github.com>
  - 74d91756c11bc22f9b0108b94da9326f7f9e376f Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - e6b050212c859fbaf67abac76105da10ec348274 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - c964fcffac27bd4a9ff67fe393410dd1146ef8b8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 72e09a54d993b192db32be14c65adf7e9bd08c31 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - d65e19dfcd8697076f68598c0131c6930cdcd74d Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 5162fc83d2f3b79a9753ed59594c43966afdd37a Merge pull request #336 from shields/patch-2 by Shaindel Schwartz <31392632+shaindelschwartz@users.noreply.github.com>
  - 0389f7bf58fa41f35b3ad60be61d32f31e4f8ed6 Merge pull request #335 from shields/patch-1 by Shaindel Schwartz <31392632+shaindelschwartz@users.noreply.github.com>
  - e9324d926a9189e222741fce6e676f0944661a72 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 43ef2148c0936ebf7cb4be6b19927a9d9d145b8f Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - a13d3df2b3ba68aeead92e2d078fba0510d55024 Merge pull request #323 from gosnik/master by Gennadiy Rozental <rogeeff@google.com>
  - 310a11865c97c5cdcc42a4ee2c2e3578423afe69 Merge pull request #324 from RasPat1/patch-1 by Gennadiy Rozental <rogeeff@google.com>
  - 8f11724067248acc330b4d1f12f0c76d03f2cfb1 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - b1dd425423380126f6441ce4fbb6f8f6c75b793a Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 361cb8a9db2f2130442389fd80593255be26d681 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 0238ab0a831f179518c1a814f9584e99da2d75a3 Merge pull request #321 from christoph-cullmann/c4245_fix... by Xiaoyi Zhang <zhangxy988@gmail.com>
  - 61c9bf3e3e1c28a4aa6d7f1be4b37fd473bb5529 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - bc9101f9982391019521161a36179b52555ed212 Merge pull request #320 from christoph-cullmann/master by Xiaoyi Zhang <zhangxy988@gmail.com>
  - 2f76a9bf50046e396138cc8eeb3cdc17b7a5ac24 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 4adaf5490921f13028b55018c9f550277de5aebb Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 27c30ec671cb7b5ba84c4e79feff7fd0b0ac6338 Avoid undefined behavior when nullptr is passed to memcpy... by Roman Gershman <romange@gmail.com>
  - ce65f5ac3cbf897bb5e3de1a51d80fd00866abaa Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - a18fc7461e7409c2ad64e28537261db1e02e76fa Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 8a394b19c149cab50534b04c5e21d42bc2217a7d Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - daf381e8535a1f1f1b8a75966a74e7cca63dee89 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - fa00c321073c7ea40a4fc3dfc8a06309eae3d025 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 436ba6c4a0ea3a06eca6e055f9c8d296bf3bae12 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 0cbdc774b97f7e80ab60dbe2ed4eaca3b2e33fc8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 27c2f6e2f3b5929fbd322b0f0ca392eb02efd9f8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - aa468ad75539619b47979911297efbb629c52e44 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - cd86d0d20ab167c33b23d3875db68d1d4bad3a3b Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 33841c5c963aa9c3f096ef8e6c1e71624b941940 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - ca3f87560a0eef716195cadf66dc6b938a579ec6 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - d902eb869bcfacc1bad14933ed9af4bed006d481 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - a02f62f456f2c4a7ecf2be3104fe0c6e16fbad9a Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 0b545b460141b882b244a1efcef7621d59278160 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - dbae8764fbd429bf7d7745e24bcf73962177a7c0 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 044da8a29c923506af0f0b46bc46f43c1e1300b5 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 6cc6ac44e065b9e8975fadfd6ccb99cbcf89aac4 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 666fc1266bccfd8e6eaaa084e7b42580bb8eb199 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 93dfcf74cb5fccae3da07897d8613ae6cab958a0 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 2c8421e1c6cef0da9e8a20b01c15256ec9ec116d Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 5b65c4af5107176555b23a638e5947686410ac1f Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - eab2078b53c9e3d9d240135c09d27e3393acb50a Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 253eb7416421661873afbaa33828a850db978541 [CMake] Set correct flags for clang-cl (#278) by Loo Rong Jie <loorongjie@gmail.com>
  - e75672f6afc7e8f23ee7b532e86d1b3b9be3984e Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - bf29470384a101b307873b26d358433138c857fc Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 6fd827124facd8336981e73218997f9e73029b4f Merge pull request #280 from chiumichael/master by Derek Mauro <761129+derekmauro@users.noreply.github.com>
  - 7c7754fb3ed9ffb57d35fe8658f3ba4d73a31e72 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 256be563447a315f2a7993ec669460ba475fa86a Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 88a152ae747c3c42dc9167d46c590929b048d436 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - c1cecb25a94c075725e9d2640f6b978a8f61957b Implement Span::first and Span::last from C++20 (#274) by Girts <girtsf@users.noreply.github.com>
  - 38b704384cd2f17590b3922b97744be0b43622c9 Changed HTTP URLs to HTTPS where possible (#270) by nik7273 <nik8470@gmail.com>
  - febc5ee6a92d0eb7dac1fceaa6c648cf6521b4dc Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 9fdf5e5b805412cb2a2e624d3e9a11588120465f Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 419f3184f8ebcdb23105295eadd2a569f3351eb9 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - b312c3cb53a0aad75a85ac2bf57c4a614fbd48d4 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 308ce31528a7edfa39f5f6d36142278a0ae1bf45 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 93d155bc4414f6c121bb1f19dba9fdb27c8943bc Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 426eaa4aa44e4580418bee46c1bd13911151bfb1 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 2901ec32a919311384d6ad4194e2d927c06831f7 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - d78310fe5a82f2e0e6e16509ef8079c8d7e4674e Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - a4cb1c8ba61531a63f9d309eea01ac1d43d8371d Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 540e2537b92cd4abfae6ceddfe24304345461f32 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 89ea0c5ff34aaa5855cfc7aa41f323b8a0ef0ede Merge pull request #255 from uilianries/hotfix/conan by ahedberg <ahedberg@google.com>
  - 5e0dcf72c64fae912184d2e0de87195fe8f0a425 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 0dffca4e36791c7beeda04da10460b534283948a Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 6b4201f9ef650637510a21b8d6cbcc3bee4a606f Fix GCC8 warnings by Boris Staletic <boris.staletic@gmail.com>
  - 0b1e6d417b414aad9282e32e8c49c719edeb63c1 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - efccc502606bed768e50a6cd5806d8eb13e4e935 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 5e6a78131f7bd5940218462c07d88cdefdd75dbe Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 5eea0f713c14ac17788b83e496f11903f8e2bbb0 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 66f9becbb98ecc083f4db349b4b1e0ca9de93b15 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 018b4db1d73ec8238e6dc4b17fd9e1fd7468d0ed Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 9449ae94397f2fd683851348e25ed8c93f75b3b9 Merge pull request #243 from ThomsonTan/FixIntrinsic by Alex Strelnikov <strel@google.com>
  - b16aeb6756bdab08cdf12d40baab5b51f7d15b16 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 7ffbe09f3d85504bd018783bbe1e2c12992fe47c Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 01b471d9f3ebef27f5aaca14b66509099fa8cd6c Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 7bd8f36c741c7cbe311611d7981bf38ba04c6fef Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 968a34ffdaadd7db062a9621dfbdf8b2d16e05af Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 3e2e9b5557e76d098de4b8a2a659125b98ca519b Merge pull request #231 from uilianries/feature/conan by Mark Barolak <mbxx@users.noreply.github.com>
  - 111ca7060a6ff50115ca85b59f6b5d8c8c5e9105 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 389ec3f906f018661a5308458d623d01f96d7b23 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 8fbcdb90952c57828c4a9c2f6d79fcd7cae9088f Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 455dc17ba1af9635f0b60155bc565bc572a1e722 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - f197d7c72a54064cfde5a2058f1513a4a0ee36fb Export of internal Abseil changes. by Abseil Team <absl-team@google.com>
  - 284378a71b32dfb3af4e3661f585e671d1b603a3 Export of internal Abseil changes. by Abseil Team <absl-team@google.com>

GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d
Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced

1 files changed, 704 insertions, 0 deletions

diff --git a/absl/random/internal/randen_hwaes.cc b/absl/random/internal/randen_hwaes.cc
new file mode 100644
index 00000000..d7eed8b2
--- /dev/null
+++ b/absl/random/internal/randen_hwaes.cc
@@ -0,0 +1,704 @@
+// 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.
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+#include "absl/random/internal/randen_hwaes.h"
+
+#include <cstdint>
+#include <cstring>
+
+#include "absl/random/internal/platform.h"
+
+// ABSL_HAVE_ATTRIBUTE
+#if !defined(ABSL_HAVE_ATTRIBUTE)
+#ifdef __has_attribute
+#define ABSL_HAVE_ATTRIBUTE(x) __has_attribute(x)
+#else
+#define ABSL_HAVE_ATTRIBUTE(x) 0
+#endif
+#endif
+
+#if ABSL_HAVE_ATTRIBUTE(always_inline) || \
+    (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE \
+  __attribute__((always_inline))
+#elif defined(_MSC_VER)
+// We can achieve something similar to attribute((always_inline)) with MSVC by
+// using the __forceinline keyword, however this is not perfect. MSVC is
+// much less aggressive about inlining, and even with the __forceinline keyword.
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE __forceinline
+#else
+#define ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+// ABSL_ATTRIBUTE_FLATTEN enables much more aggressive inlining within
+// the indicated function.
+#undef ABSL_ATTRIBUTE_FLATTEN
+#if ABSL_HAVE_ATTRIBUTE(flatten) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_ATTRIBUTE_FLATTEN __attribute__((flatten))
+#else
+#define ABSL_ATTRIBUTE_FLATTEN
+#endif
+
+// ABSL_RANDEN_HWAES_IMPL indicates whether this file will contain
+// a hardware accelerated implementation of randen, or whether it
+// will contain stubs that exit the process.
+#if defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
+// The platform.h directives are sufficient to indicate whether
+// we should build accelerated implementations for x86.
+#if (ABSL_HAVE_ACCELERATED_AES || ABSL_RANDOM_INTERNAL_AES_DISPATCH)
+#define ABSL_RANDEN_HWAES_IMPL 1
+#endif
+#elif defined(ABSL_ARCH_PPC)
+// The platform.h directives are sufficient to indicate whether
+// we should build accelerated implementations for PPC.
+//
+// NOTE: This has mostly been tested on 64-bit Power variants,
+// and not embedded cpus such as powerpc32-8540
+#if ABSL_HAVE_ACCELERATED_AES
+#define ABSL_RANDEN_HWAES_IMPL 1
+#endif
+#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+// ARM is somewhat more complicated. We might support crypto natively...
+#if ABSL_HAVE_ACCELERATED_AES || \
+    (defined(__ARM_NEON) && defined(__ARM_FEATURE_CRYPTO))
+#define ABSL_RANDEN_HWAES_IMPL 1
+
+#elif ABSL_RANDOM_INTERNAL_AES_DISPATCH && !defined(__APPLE__) && \
+    (defined(__GNUC__) && __GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 9)
+// ...or, on GCC, we can use an ASM directive to
+// instruct the assember to allow crypto instructions.
+#define ABSL_RANDEN_HWAES_IMPL 1
+#define ABSL_RANDEN_HWAES_IMPL_CRYPTO_DIRECTIVE 1
+#endif
+#else
+// HWAES is unsupported by these architectures / platforms:
+//   __myriad2__
+//   __mips__
+//
+// Other architectures / platforms are unknown.
+//
+// See the Abseil documentation on supported macros at:
+// https://abseil.io/docs/cpp/platforms/macros
+#endif
+
+#if !defined(ABSL_RANDEN_HWAES_IMPL)
+// No accelerated implementation is supported.
+// The RandenHwAes functions are stubs that print an error and exit.
+
+#include <cstdio>
+#include <cstdlib>
+
+namespace absl {
+inline namespace lts_2019_08_08 {
+namespace random_internal {
+
+// No accelerated implementation.
+bool HasRandenHwAesImplementation() { return false; }
+
+// NOLINTNEXTLINE
+const void* RandenHwAes::GetKeys() {
+  // Attempted to dispatch to an unsupported dispatch target.
+  const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
+  fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
+  exit(1);
+  return nullptr;
+}
+
+// NOLINTNEXTLINE
+void RandenHwAes::Absorb(const void*, void*) {
+  // Attempted to dispatch to an unsupported dispatch target.
+  const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
+  fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
+  exit(1);
+}
+
+// NOLINTNEXTLINE
+void RandenHwAes::Generate(const void*, void*) {
+  // Attempted to dispatch to an unsupported dispatch target.
+  const int d = ABSL_RANDOM_INTERNAL_AES_DISPATCH;
+  fprintf(stderr, "AES Hardware detection failed (%d).\n", d);
+  exit(1);
+}
+
+}  // namespace random_internal
+}  // inline namespace lts_2019_08_08
+}  // namespace absl
+
+#else  // defined(ABSL_RANDEN_HWAES_IMPL)
+//
+// Accelerated implementations are supported.
+// We need the per-architecture includes and defines.
+//
+
+#include "absl/random/internal/randen_traits.h"
+
+// ABSL_FUNCTION_ALIGN32 defines a 32-byte alignment attribute
+// for the functions in this file.
+//
+// NOTE: Determine whether we actually have any wins from ALIGN32
+// using microbenchmarks. If not, remove.
+#undef ABSL_FUNCTION_ALIGN32
+#if ABSL_HAVE_ATTRIBUTE(aligned) || (defined(__GNUC__) && !defined(__clang__))
+#define ABSL_FUNCTION_ALIGN32 __attribute__((aligned(32)))
+#else
+#define ABSL_FUNCTION_ALIGN32
+#endif
+
+// TARGET_CRYPTO defines a crypto attribute for each architecture.
+//
+// NOTE: Evaluate whether we should eliminate ABSL_TARGET_CRYPTO.
+#if (defined(__clang__) || defined(__GNUC__))
+#if defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
+#define ABSL_TARGET_CRYPTO __attribute__((target("aes")))
+#elif defined(ABSL_ARCH_PPC)
+#define ABSL_TARGET_CRYPTO __attribute__((target("crypto")))
+#else
+#define ABSL_TARGET_CRYPTO
+#endif
+#else
+#define ABSL_TARGET_CRYPTO
+#endif
+
+#if defined(ABSL_ARCH_PPC)
+// NOTE: Keep in mind that PPC can operate in little-endian or big-endian mode,
+// however the PPC altivec vector registers (and thus the AES instructions)
+// always operate in big-endian mode.
+
+#include <altivec.h>
+// <altivec.h> #defines vector __vector; in C++, this is bad form.
+#undef vector
+
+// Rely on the PowerPC AltiVec vector operations for accelerated AES
+// instructions. GCC support of the PPC vector types is described in:
+// https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/PowerPC-AltiVec_002fVSX-Built-in-Functions.html
+//
+// Already provides operator^=.
+using Vector128 = __vector unsigned long long;  // NOLINT(runtime/int)
+
+namespace {
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+ReverseBytes(const Vector128& v) {
+  // Reverses the bytes of the vector.
+  const __vector unsigned char perm = {15, 14, 13, 12, 11, 10, 9, 8,
+                                       7,  6,  5,  4,  3,  2,  1, 0};
+  return vec_perm(v, v, perm);
+}
+
+// WARNING: these load/store in native byte order. It is OK to load and then
+// store an unchanged vector, but interpreting the bits as a number or input
+// to AES will have undefined results.
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+Vector128Load(const void* ABSL_RANDOM_INTERNAL_RESTRICT from) {
+  return vec_vsx_ld(0, reinterpret_cast<const Vector128*>(from));
+}
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void
+Vector128Store(const Vector128& v, void* ABSL_RANDOM_INTERNAL_RESTRICT to) {
+  vec_vsx_st(v, 0, reinterpret_cast<Vector128*>(to));
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+AesRound(const Vector128& state, const Vector128& round_key) {
+  return Vector128(__builtin_crypto_vcipher(state, round_key));
+}
+
+// Enables native loads in the round loop by pre-swapping.
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void
+SwapEndian(uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT state) {
+  using absl::random_internal::RandenTraits;
+  constexpr size_t kLanes = 2;
+  constexpr size_t kFeistelBlocks = RandenTraits::kFeistelBlocks;
+
+  for (uint32_t branch = 0; branch < kFeistelBlocks; ++branch) {
+    const Vector128 v = ReverseBytes(Vector128Load(state + kLanes * branch));
+    Vector128Store(v, state + kLanes * branch);
+  }
+}
+
+}  // namespace
+
+#elif defined(ABSL_ARCH_ARM) || defined(ABSL_ARCH_AARCH64)
+
+// This asm directive will cause the file to be compiled with crypto extensions
+// whether or not the cpu-architecture supports it.
+#if ABSL_RANDEN_HWAES_IMPL_CRYPTO_DIRECTIVE
+asm(".arch_extension  crypto\n");
+
+// Override missing defines.
+#if !defined(__ARM_NEON)
+#define __ARM_NEON 1
+#endif
+
+#if !defined(__ARM_FEATURE_CRYPTO)
+#define __ARM_FEATURE_CRYPTO 1
+#endif
+
+#endif
+
+// Rely on the ARM NEON+Crypto advanced simd types, defined in <arm_neon.h>.
+// uint8x16_t is the user alias for underlying __simd128_uint8_t type.
+// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0073a/IHI0073A_arm_neon_intrinsics_ref.pdf
+//
+// <arm_neon> defines the following
+//
+// typedef __attribute__((neon_vector_type(16))) uint8_t uint8x16_t;
+// typedef __attribute__((neon_vector_type(16))) int8_t int8x16_t;
+// typedef __attribute__((neon_polyvector_type(16))) int8_t poly8x16_t;
+//
+// vld1q_v
+// vst1q_v
+// vaeseq_v
+// vaesmcq_v
+#include <arm_neon.h>
+
+// Already provides operator^=.
+using Vector128 = uint8x16_t;
+
+namespace {
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+Vector128Load(const void* ABSL_RANDOM_INTERNAL_RESTRICT from) {
+  return vld1q_u8(reinterpret_cast<const uint8_t*>(from));
+}
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void
+Vector128Store(const Vector128& v, void* ABSL_RANDOM_INTERNAL_RESTRICT to) {
+  vst1q_u8(reinterpret_cast<uint8_t*>(to), v);
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+AesRound(const Vector128& state, const Vector128& round_key) {
+  // It is important to always use the full round function - omitting the
+  // final MixColumns reduces security [https://eprint.iacr.org/2010/041.pdf]
+  // and does not help because we never decrypt.
+  //
+  // Note that ARM divides AES instructions differently than x86 / PPC,
+  // And we need to skip the first AddRoundKey step and add an extra
+  // AddRoundKey step to the end. Lucky for us this is just XOR.
+  return vaesmcq_u8(vaeseq_u8(state, uint8x16_t{})) ^ round_key;
+}
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void
+SwapEndian(uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT) {}
+
+}  // namespace
+
+#elif defined(ABSL_ARCH_X86_64) || defined(ABSL_ARCH_X86_32)
+// On x86 we rely on the aesni instructions
+#include <wmmintrin.h>
+
+namespace {
+
+// Vector128 class is only wrapper for __m128i, benchmark indicates that it's
+// faster than using __m128i directly.
+class Vector128 {
+ public:
+  // Convert from/to intrinsics.
+  inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE explicit Vector128(
+      const __m128i& Vector128)
+      : data_(Vector128) {}
+
+  inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE __m128i data() const {
+    return data_;
+  }
+
+  inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128& operator^=(
+      const Vector128& other) {
+    data_ = _mm_xor_si128(data_, other.data());
+    return *this;
+  }
+
+ private:
+  __m128i data_;
+};
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+Vector128Load(const void* ABSL_RANDOM_INTERNAL_RESTRICT from) {
+  return Vector128(_mm_load_si128(reinterpret_cast<const __m128i*>(from)));
+}
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void
+Vector128Store(const Vector128& v, void* ABSL_RANDOM_INTERNAL_RESTRICT to) {
+  _mm_store_si128(reinterpret_cast<__m128i * ABSL_RANDOM_INTERNAL_RESTRICT>(to),
+                  v.data());
+}
+
+// One round of AES. "round_key" is a public constant for breaking the
+// symmetry of AES (ensures previously equal columns differ afterwards).
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE Vector128
+AesRound(const Vector128& state, const Vector128& round_key) {
+  // It is important to always use the full round function - omitting the
+  // final MixColumns reduces security [https://eprint.iacr.org/2010/041.pdf]
+  // and does not help because we never decrypt.
+  return Vector128(_mm_aesenc_si128(state.data(), round_key.data()));
+}
+
+inline ABSL_TARGET_CRYPTO ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE void
+SwapEndian(uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT) {}
+
+}  // namespace
+
+#endif
+
+namespace {
+
+// u64x2 is a 128-bit, (2 x uint64_t lanes) struct used to store
+// the randen_keys.
+struct alignas(16) u64x2 {
+  constexpr u64x2(uint64_t hi, uint64_t lo)
+#if defined(ABSL_ARCH_PPC)
+      // This has been tested with PPC running in little-endian mode;
+      // We byte-swap the u64x2 structure from little-endian to big-endian
+      // because altivec always runs in big-endian mode.
+      : v{__builtin_bswap64(hi), __builtin_bswap64(lo)} {
+#else
+      : v{lo, hi} {
+#endif
+  }
+
+  constexpr bool operator==(const u64x2& other) const {
+    return v[0] == other.v[0] && v[1] == other.v[1];
+  }
+
+  constexpr bool operator!=(const u64x2& other) const {
+    return !(*this == other);
+  }
+
+  uint64_t v[2];
+};  // namespace
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-pragmas"
+#endif
+
+// At this point, all of the platform-specific features have been defined /
+// implemented.
+//
+// REQUIRES: using u64x2 = ...
+// REQUIRES: using Vector128 = ...
+// REQUIRES: Vector128 Vector128Load(void*) {...}
+// REQUIRES: void Vector128Store(Vector128, void*) {...}
+// REQUIRES: Vector128 AesRound(Vector128, Vector128) {...}
+// REQUIRES: void SwapEndian(uint64_t*) {...}
+//
+// PROVIDES: absl::random_internal::RandenHwAes::Absorb
+// PROVIDES: absl::random_internal::RandenHwAes::Generate
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+//
+// High-level summary:
+// 1) Reverie (see "A Robust and Sponge-Like PRNG with Improved Efficiency") is
+//    a sponge-like random generator that requires a cryptographic permutation.
+//    It improves upon "Provably Robust Sponge-Based PRNGs and KDFs" by
+//    achieving backtracking resistance with only one Permute() per buffer.
+//
+// 2) "Simpira v2: A Family of Efficient Permutations Using the AES Round
+//    Function" constructs up to 1024-bit permutations using an improved
+//    Generalized Feistel network with 2-round AES-128 functions. This Feistel
+//    block shuffle achieves diffusion faster and is less vulnerable to
+//    sliced-biclique attacks than the Type-2 cyclic shuffle.
+//
+// 3) "Improving the Generalized Feistel" and "New criterion for diffusion
+//    property" extends the same kind of improved Feistel block shuffle to 16
+//    branches, which enables a 2048-bit permutation.
+//
+// We combine these three ideas and also change Simpira's subround keys from
+// structured/low-entropy counters to digits of Pi.
+
+// Randen constants.
+using absl::random_internal::RandenTraits;
+constexpr size_t kStateBytes = RandenTraits::kStateBytes;
+constexpr size_t kCapacityBytes = RandenTraits::kCapacityBytes;
+constexpr size_t kFeistelBlocks = RandenTraits::kFeistelBlocks;
+constexpr size_t kFeistelRounds = RandenTraits::kFeistelRounds;
+constexpr size_t kFeistelFunctions = RandenTraits::kFeistelFunctions;
+
+// Independent keys (272 = 2.1 KiB) for the first AES subround of each function.
+constexpr size_t kKeys = kFeistelRounds * kFeistelFunctions;
+
+// INCLUDE keys.
+#include "absl/random/internal/randen-keys.inc"
+
+static_assert(kKeys == kRoundKeys, "kKeys and kRoundKeys must be equal");
+static_assert(round_keys[kKeys - 1] != u64x2(0, 0),
+              "Too few round_keys initializers");
+
+// Number of uint64_t lanes per 128-bit vector;
+constexpr size_t kLanes = 2;
+
+// Block shuffles applies a shuffle to the entire state between AES rounds.
+// Improved odd-even shuffle from "New criterion for diffusion property".
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE ABSL_TARGET_CRYPTO void
+BlockShuffle(uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT state) {
+  static_assert(kFeistelBlocks == 16, "Expecting 16 FeistelBlocks.");
+
+  constexpr size_t shuffle[kFeistelBlocks] = {7,  2, 13, 4,  11, 8,  3, 6,
+                                              15, 0, 9,  10, 1,  14, 5, 12};
+
+  // The fully unrolled loop without the memcpy improves the speed by about
+  // 30% over the equivalent loop.
+  const Vector128 v0 = Vector128Load(state + kLanes * shuffle[0]);
+  const Vector128 v1 = Vector128Load(state + kLanes * shuffle[1]);
+  const Vector128 v2 = Vector128Load(state + kLanes * shuffle[2]);
+  const Vector128 v3 = Vector128Load(state + kLanes * shuffle[3]);
+  const Vector128 v4 = Vector128Load(state + kLanes * shuffle[4]);
+  const Vector128 v5 = Vector128Load(state + kLanes * shuffle[5]);
+  const Vector128 v6 = Vector128Load(state + kLanes * shuffle[6]);
+  const Vector128 v7 = Vector128Load(state + kLanes * shuffle[7]);
+  const Vector128 w0 = Vector128Load(state + kLanes * shuffle[8]);
+  const Vector128 w1 = Vector128Load(state + kLanes * shuffle[9]);
+  const Vector128 w2 = Vector128Load(state + kLanes * shuffle[10]);
+  const Vector128 w3 = Vector128Load(state + kLanes * shuffle[11]);
+  const Vector128 w4 = Vector128Load(state + kLanes * shuffle[12]);
+  const Vector128 w5 = Vector128Load(state + kLanes * shuffle[13]);
+  const Vector128 w6 = Vector128Load(state + kLanes * shuffle[14]);
+  const Vector128 w7 = Vector128Load(state + kLanes * shuffle[15]);
+
+  Vector128Store(v0, state + kLanes * 0);
+  Vector128Store(v1, state + kLanes * 1);
+  Vector128Store(v2, state + kLanes * 2);
+  Vector128Store(v3, state + kLanes * 3);
+  Vector128Store(v4, state + kLanes * 4);
+  Vector128Store(v5, state + kLanes * 5);
+  Vector128Store(v6, state + kLanes * 6);
+  Vector128Store(v7, state + kLanes * 7);
+  Vector128Store(w0, state + kLanes * 8);
+  Vector128Store(w1, state + kLanes * 9);
+  Vector128Store(w2, state + kLanes * 10);
+  Vector128Store(w3, state + kLanes * 11);
+  Vector128Store(w4, state + kLanes * 12);
+  Vector128Store(w5, state + kLanes * 13);
+  Vector128Store(w6, state + kLanes * 14);
+  Vector128Store(w7, state + kLanes * 15);
+}
+
+// Feistel round function using two AES subrounds. Very similar to F()
+// from Simpira v2, but with independent subround keys. Uses 17 AES rounds
+// per 16 bytes (vs. 10 for AES-CTR). Computing eight round functions in
+// parallel hides the 7-cycle AESNI latency on HSW. Note that the Feistel
+// XORs are 'free' (included in the second AES instruction).
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE ABSL_TARGET_CRYPTO const
+    u64x2*
+    FeistelRound(uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT state,
+                 const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys) {
+  static_assert(kFeistelBlocks == 16, "Expecting 16 FeistelBlocks.");
+
+  // MSVC does a horrible job at unrolling loops.
+  // So we unroll the loop by hand to improve the performance.
+  const Vector128 s0 = Vector128Load(state + kLanes * 0);
+  const Vector128 s1 = Vector128Load(state + kLanes * 1);
+  const Vector128 s2 = Vector128Load(state + kLanes * 2);
+  const Vector128 s3 = Vector128Load(state + kLanes * 3);
+  const Vector128 s4 = Vector128Load(state + kLanes * 4);
+  const Vector128 s5 = Vector128Load(state + kLanes * 5);
+  const Vector128 s6 = Vector128Load(state + kLanes * 6);
+  const Vector128 s7 = Vector128Load(state + kLanes * 7);
+  const Vector128 s8 = Vector128Load(state + kLanes * 8);
+  const Vector128 s9 = Vector128Load(state + kLanes * 9);
+  const Vector128 s10 = Vector128Load(state + kLanes * 10);
+  const Vector128 s11 = Vector128Load(state + kLanes * 11);
+  const Vector128 s12 = Vector128Load(state + kLanes * 12);
+  const Vector128 s13 = Vector128Load(state + kLanes * 13);
+  const Vector128 s14 = Vector128Load(state + kLanes * 14);
+  const Vector128 s15 = Vector128Load(state + kLanes * 15);
+
+  // Encode even blocks with keys.
+  const Vector128 e0 = AesRound(s0, Vector128Load(keys + 0));
+  const Vector128 e2 = AesRound(s2, Vector128Load(keys + 1));
+  const Vector128 e4 = AesRound(s4, Vector128Load(keys + 2));
+  const Vector128 e6 = AesRound(s6, Vector128Load(keys + 3));
+  const Vector128 e8 = AesRound(s8, Vector128Load(keys + 4));
+  const Vector128 e10 = AesRound(s10, Vector128Load(keys + 5));
+  const Vector128 e12 = AesRound(s12, Vector128Load(keys + 6));
+  const Vector128 e14 = AesRound(s14, Vector128Load(keys + 7));
+
+  // Encode odd blocks with even output from above.
+  const Vector128 o1 = AesRound(e0, s1);
+  const Vector128 o3 = AesRound(e2, s3);
+  const Vector128 o5 = AesRound(e4, s5);
+  const Vector128 o7 = AesRound(e6, s7);
+  const Vector128 o9 = AesRound(e8, s9);
+  const Vector128 o11 = AesRound(e10, s11);
+  const Vector128 o13 = AesRound(e12, s13);
+  const Vector128 o15 = AesRound(e14, s15);
+
+  // Store odd blocks. (These will be shuffled later).
+  Vector128Store(o1, state + kLanes * 1);
+  Vector128Store(o3, state + kLanes * 3);
+  Vector128Store(o5, state + kLanes * 5);
+  Vector128Store(o7, state + kLanes * 7);
+  Vector128Store(o9, state + kLanes * 9);
+  Vector128Store(o11, state + kLanes * 11);
+  Vector128Store(o13, state + kLanes * 13);
+  Vector128Store(o15, state + kLanes * 15);
+
+  return keys + 8;
+}
+
+// Cryptographic permutation based via type-2 Generalized Feistel Network.
+// Indistinguishable from ideal by chosen-ciphertext adversaries using less than
+// 2^64 queries if the round function is a PRF. This is similar to the b=8 case
+// of Simpira v2, but more efficient than its generic construction for b=16.
+inline ABSL_RANDOM_INTERNAL_ATTRIBUTE_ALWAYS_INLINE ABSL_TARGET_CRYPTO void
+Permute(const void* ABSL_RANDOM_INTERNAL_RESTRICT keys,
+        uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT state) {
+  const u64x2* ABSL_RANDOM_INTERNAL_RESTRICT keys128 =
+      static_cast<const u64x2*>(keys);
+
+  // (Successfully unrolled; the first iteration jumps into the second half)
+#ifdef __clang__
+#pragma clang loop unroll_count(2)
+#endif
+  for (size_t round = 0; round < kFeistelRounds; ++round) {
+    keys128 = FeistelRound(state, keys128);
+    BlockShuffle(state);
+  }
+}
+
+}  // namespace
+
+namespace absl {
+inline namespace lts_2019_08_08 {
+namespace random_internal {
+
+bool HasRandenHwAesImplementation() { return true; }
+
+const void* ABSL_TARGET_CRYPTO ABSL_FUNCTION_ALIGN32 ABSL_ATTRIBUTE_FLATTEN
+RandenHwAes::GetKeys() {
+  // Round keys for one AES per Feistel round and branch.
+  // The canonical implementation uses first digits of Pi.
+  return round_keys;
+}
+
+// NOLINTNEXTLINE
+void ABSL_TARGET_CRYPTO ABSL_FUNCTION_ALIGN32 ABSL_ATTRIBUTE_FLATTEN
+RandenHwAes::Absorb(const void* seed_void, void* state_void) {
+  uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT state =
+      reinterpret_cast<uint64_t*>(state_void);
+  const uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT seed =
+      reinterpret_cast<const uint64_t*>(seed_void);
+
+  constexpr size_t kCapacityBlocks = kCapacityBytes / sizeof(Vector128);
+  constexpr size_t kStateBlocks = kStateBytes / sizeof(Vector128);
+
+  static_assert(kCapacityBlocks * sizeof(Vector128) == kCapacityBytes,
+                "Not i*V");
+  static_assert(kCapacityBlocks == 1, "Unexpected Randen kCapacityBlocks");
+  static_assert(kStateBlocks == 16, "Unexpected Randen kStateBlocks");
+
+  Vector128 b1 = Vector128Load(state + kLanes * 1);
+  b1 ^= Vector128Load(seed + kLanes * 0);
+  Vector128Store(b1, state + kLanes * 1);
+
+  Vector128 b2 = Vector128Load(state + kLanes * 2);
+  b2 ^= Vector128Load(seed + kLanes * 1);
+  Vector128Store(b2, state + kLanes * 2);
+
+  Vector128 b3 = Vector128Load(state + kLanes * 3);
+  b3 ^= Vector128Load(seed + kLanes * 2);
+  Vector128Store(b3, state + kLanes * 3);
+
+  Vector128 b4 = Vector128Load(state + kLanes * 4);
+  b4 ^= Vector128Load(seed + kLanes * 3);
+  Vector128Store(b4, state + kLanes * 4);
+
+  Vector128 b5 = Vector128Load(state + kLanes * 5);
+  b5 ^= Vector128Load(seed + kLanes * 4);
+  Vector128Store(b5, state + kLanes * 5);
+
+  Vector128 b6 = Vector128Load(state + kLanes * 6);
+  b6 ^= Vector128Load(seed + kLanes * 5);
+  Vector128Store(b6, state + kLanes * 6);
+
+  Vector128 b7 = Vector128Load(state + kLanes * 7);
+  b7 ^= Vector128Load(seed + kLanes * 6);
+  Vector128Store(b7, state + kLanes * 7);
+
+  Vector128 b8 = Vector128Load(state + kLanes * 8);
+  b8 ^= Vector128Load(seed + kLanes * 7);
+  Vector128Store(b8, state + kLanes * 8);
+
+  Vector128 b9 = Vector128Load(state + kLanes * 9);
+  b9 ^= Vector128Load(seed + kLanes * 8);
+  Vector128Store(b9, state + kLanes * 9);
+
+  Vector128 b10 = Vector128Load(state + kLanes * 10);
+  b10 ^= Vector128Load(seed + kLanes * 9);
+  Vector128Store(b10, state + kLanes * 10);
+
+  Vector128 b11 = Vector128Load(state + kLanes * 11);
+  b11 ^= Vector128Load(seed + kLanes * 10);
+  Vector128Store(b11, state + kLanes * 11);
+
+  Vector128 b12 = Vector128Load(state + kLanes * 12);
+  b12 ^= Vector128Load(seed + kLanes * 11);
+  Vector128Store(b12, state + kLanes * 12);
+
+  Vector128 b13 = Vector128Load(state + kLanes * 13);
+  b13 ^= Vector128Load(seed + kLanes * 12);
+  Vector128Store(b13, state + kLanes * 13);
+
+  Vector128 b14 = Vector128Load(state + kLanes * 14);
+  b14 ^= Vector128Load(seed + kLanes * 13);
+  Vector128Store(b14, state + kLanes * 14);
+
+  Vector128 b15 = Vector128Load(state + kLanes * 15);
+  b15 ^= Vector128Load(seed + kLanes * 14);
+  Vector128Store(b15, state + kLanes * 15);
+}
+
+// NOLINTNEXTLINE
+void ABSL_TARGET_CRYPTO ABSL_FUNCTION_ALIGN32 ABSL_ATTRIBUTE_FLATTEN
+RandenHwAes::Generate(const void* keys, void* state_void) {
+  static_assert(kCapacityBytes == sizeof(Vector128), "Capacity mismatch");
+
+  uint64_t* ABSL_RANDOM_INTERNAL_RESTRICT state =
+      reinterpret_cast<uint64_t*>(state_void);
+
+  const Vector128 prev_inner = Vector128Load(state);
+
+  SwapEndian(state);
+
+  Permute(keys, state);
+
+  SwapEndian(state);
+
+  // Ensure backtracking resistance.
+  Vector128 inner = Vector128Load(state);
+  inner ^= prev_inner;
+  Vector128Store(inner, state);
+}
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+}  // namespace random_internal
+}  // inline namespace lts_2019_08_08
+}  // namespace absl
+
+#endif  // (ABSL_RANDEN_HWAES_IMPL)