Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .cc files in */internal/.)
Bug: chromium:1292951
PiperOrigin-RevId: 471561809
Change-Id: I7abd6d83706f5ca135f1ce3458192a498a6280b9
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .cc files in */internal/.)
Bug: chromium:1292951
PiperOrigin-RevId: 471549854
Change-Id: Id685d0e4666212926f4e001b8ef4930b6a33a4cc
The Lexan and MSVC toolchains both set _MSC_VER. The MSVC toolchain must set `ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE` and `ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE`, in order to use Abseil workarounds in the absence of these types. This is not necessary for clang-cl.
This change excludes clang-cl from the predicate setting these variables.
PiperOrigin-RevId: 465589196
Change-Id: I0426ec4f844aabe7cdde5c60725f6a9a6b16479f
There's no point redefining these functions if they are supported by the compiler and the version of libstdc++. Also, some of the builtins used by the absl implementation of these functions (e.g. __has_trivial_destructor) have been deprecated in Clang 15.
PiperOrigin-RevId: 465554125
Change-Id: I8674c3a5270ce3c654cdf58ae7dbd9d2bda8faa5
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .cc files in dirs a-h.)
Bug: chromium:1292951
PiperOrigin-RevId: 464541951
Change-Id: If23b63ccea8e9b730159ff1c7288e9300a40b6bd
Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare
(This specific CL focuses on .h and win32 .inc files.)
Bug: chromium:1292951
PiperOrigin-RevId: 463835431
Change-Id: If8e5f7f651d5cd96035e23e4623bdb08a7fedabe
Adds policy checks the raise the minimum C++ version to C++14
and the minimum GCC version to GCC 5
Updates the docs to indicate the C++14 minimum.
PiperOrigin-RevId: 459401288
Change-Id: I18878f0e13001c57e97e26ad7c9a9c9c12c39265
Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1197
Fix the following musl build failure on mips:
```
In file included from /nvmedata/autobuild/instance-15/output-1/build/libabseil-cpp-20211102.0/absl/base/internal/low_level_alloc.cc:26:
/nvmedata/autobuild/instance-15/output-1/build/libabseil-cpp-20211102.0/absl/base/internal/direct_mmap.h:49:10: fatal error: sgidefs.h: No such file or directory
49 | #include <sgidefs.h>
| ^~~~~~~~~~~
```
Fixes:
- http://autobuild.buildroot.org/results/3fa027e602bacb22316fb5d9b233baa0b0f0e845
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Merge c9b5b5c547 into a184bab83f
Merging this change closes#1197
COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1197 from ffontaine:master c9b5b5c547
PiperOrigin-RevId: 455467767
Change-Id: I1905f7d70e914288bc1524a52adce3476a779fd8
The intent of the macro is to say what locks cannot be held when calling the method, not making a promise that they will be acquired.
PiperOrigin-RevId: 454158686
Change-Id: I71087460c3df27c7d6e0571156f19f525024f1de
This change introduces the symbol
ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL
to guard redundant declarations of static constexpr data
members that are needed prior to C++17.
This change also introduces the symbol
ABSL_INTERNAL_CPLUSPLUS_LANG, which is supposed to be set
to the same value as __cplusplus, except it uses _MSVC_LANG
on MSVC so that the value is correct on MSVC.
Neither of these new symbols should be used outside of Abseil.
Fixes#1191
PiperOrigin-RevId: 453923908
Change-Id: I1316c52c19fa0c168b93cced0c817e4cb7c9c862
https://pastebin.com/CmnzwUFN
The key idea is to avoid using 16 byte NEON and use 8 byte NEON which has lower latency for BitMask::Match. Even though 16 byte NEON achieves higher throughput, in SwissMap it's very important to catch these Matches with low latency as probing on average happens at most once.
I also introduced NonIterableMask as ARM has really great cbnz instructions and additional AND on scalar mask had 1 extra latency cycle
PiperOrigin-RevId: 453216147
Change-Id: I842c50d323954f8383ae156491232ced55aacb78
Timeouts were once necessary when the SpinLock Unlock used an atomic
store and could therefore have a race and a missed wakeup, however,
the Unlock path now uses an atomic exchange, so the missed wakeup
cannot happen.
Fixes#1179
PiperOrigin-RevId: 452047517
Change-Id: I844944879b51b7f7ddac148e063a376cddd0d05a
Benchmarks: https://pastebin.com/tZ7dr67W. Works well especially on smaller ranges.
After a week on spending optimizing NEON SIMD where I almost managed to make hash tables work with NEON SIMD without performance hits (still 1 cycle to optimize and I gave up a little), I found an interesting optimization for aarch64 to use cls instruction (count leading sign bits).
The loop has a property that ctrl_ group is not matched against count when the first slot is empty or deleted.
```
void skip_empty_or_deleted() {
while (IsEmptyOrDeleted(*ctrl_)) {
uint32_t shift = Group{ctrl_}.CountLeadingEmptyOrDeleted();
ctrl_ += shift;
slot_ += shift;
}
...
}
```
However, `kEmpty` and `kDeleted` have format of `1xxxxxx0` and `~ctrl & (ctrl >> 7)` always sets the lowest bit to 1.
In naive implementation, it does +1 to start counting zero bits, however, in aarch64 we may start counting one bits immediately. This saves 1 cycle and 5% of iteration performance.
Then it becomes hard to find a supported and sustainable C++ version of it.
`__clsll` is not supported by GCC and was supported only since clang 8, `__builtin_clrsb` is not producing optimal codegen for clang. `__rbit` is not supported by GCC and there is no intrinsic to do that, however, in clang we have `__builtin_bitreverse{32,64}`. For now I decided to enable this only for clang, only if they have appropriate builtins.
PiperOrigin-RevId: 451168570
Change-Id: I7e9256a60aecdc88ced4e6eb15ebc257281b6664
Previously was disabled on iPhone, but still enabled for macOS.
The unscaled cycle clock does not work correctly when run on a VM.
PiperOrigin-RevId: 449876559
Change-Id: I679ade90b43462e8d2794b1a2b32569d59029ed9
Add a new (internal) feature test macro to detect whether the wrappers are no-ops on a given platform.
Note that one-arg __builtin_prefetch(x) is equivalent to __builtin_prefetch(x, 0, 3), per `man BUILTIN_PREFETCH(3)` and gcc docs.
PiperOrigin-RevId: 449508660
Change-Id: I144e750205eec0c956d8dd62bc72e10bdb87c4f7
--
3d018c03a34bf273a4b24b3584ed77f0a6d21686 by Abseil Team <absl-team@google.com>:
Fix a spelling typo (s/boundries/boundaries).
PiperOrigin-RevId: 442041877
Change-Id: I608020697d37b85316bb9a0838e4b457659c926c
--
518b8119e51db24ce7fb0fd2fe537ec43825c3e6 by Dino Radakovic <dinor@google.com>:
absl/types/internal/variant: Make include guard uppercase
https://google.github.io/styleguide/cppguide.html#The__define_Guard
PiperOrigin-RevId: 441911692
Change-Id: I9837dd07f20204d8253f20627b0917a34dc21825
--
b91696c38310a7cae8c1ea9e2d479495f5dc3f69 by Greg Falcon <gfalcon@google.com>:
Add an internal-only API to wrap __builtin_prefetch() if available.
This private API is intended for future use by the Abseil implementation. Like any internal-namespaced function, it may be changed or removed at any time.
PiperOrigin-RevId: 441894616
Change-Id: Iaa48bd4680b373f4a0d5afab0cb35e2a1908595f
--
0f01e8b0551a662e02dff60840c54320f987315f by Derek Mauro <dmauro@google.com>:
C++20: Use the standard `constinit` keyword for `ABSL_CONST_INIT` when available
PiperOrigin-RevId: 441778874
Change-Id: I70c616469752ff23b326b1c615437599f42cc6aa
GitOrigin-RevId: 3d018c03a34bf273a4b24b3584ed77f0a6d21686
--
f4c7e510922668c68be4aa79a00867c3d3ca9f95 by Derek Mauro <dmauro@google.com>:
Many improvements to LeakChecker builds
The presence of the LeakChecker is now detected when possible. GCC
users using LeakChecker in standalone mode still need to use
-DLEAK_CHECKER. This is now documented in the header.
The hacky targets used for testing leak checking have been removed in
favor of testing in AddressSanitizer mode on Kokoro.
Fixes#885Fixes#1153
PiperOrigin-RevId: 441203393
Change-Id: Ibe64ef6b104bcaf31839ff7184e558cc86abdd1c
--
5c70a23aa83b8152ab95d2cf21662fc63c80ef7d by Abseil Team <absl-team@google.com>:
Add a benchmark for stacktrace
PiperOrigin-RevId: 441196473
Change-Id: I4c9aa2e797aa2cae09abfaaee3abe5c09eb62fc4
--
50b406052273b9d5bad04a7860a96e4d5d956c02 by Abseil Team <absl-team@google.com>:
Internal change.
PiperOrigin-RevId: 441114481
Change-Id: I667af7a50d5631ca91289dd24c91ba90233e0184
--
568b4eaac120b420bce5290179d407d2b57d5bae by Dino Radakovic <dinor@google.com>:
Internal change
PiperOrigin-RevId: 440894155
Change-Id: Ia587ffc65a8321126585fb363b7c0ca8cc2a0da2
--
d53948eace4f3a10ac5a6c1496dc51b81adc412c by Abseil Team <absl-team@google.com>:
Explicitly give internal linkage to symbols which are not used outside of their
translation units.
PiperOrigin-RevId: 440424519
Change-Id: I531c5e229d443375483b7550a34f48042589a99b
GitOrigin-RevId: f4c7e510922668c68be4aa79a00867c3d3ca9f95
--
0c8848ebedc07470c7ab647a5bb8949481540ce9 by Dino Radakovic <dinor@google.com>:
Define absl::base_internal::invoke using std::invoke when C++ >= 17
PiperOrigin-RevId: 439880834
Change-Id: I3622fcf473501d54c57575118a11d54c19573446
GitOrigin-RevId: 0c8848ebedc07470c7ab647a5bb8949481540ce9
--
b984c7c1cbee4253192c833046bfcfa16dca8ccf by Dino Radakovic <dinor@google.com>:
Restrict visibility of absl/flags:commandlineflag_internal
PiperOrigin-RevId: 438591894
Change-Id: I12a6392b2c7f9f1263c741dfd6c43ae22e903aad
--
81315601aab70bb6ac2d17655a727d7f9ee2ff95 by Justin Lebar <jlebar@google.com>:
Update example in str_join.h to use a lambda.
PiperOrigin-RevId: 438390035
Change-Id: Icc707b972e5a369a71ad774004fdf0a17a9b33a7
--
1c3c7921224e505faca8617b073f657d3737219f by Dino Radakovic <dinor@google.com>:
Internal change
PiperOrigin-RevId: 438386036
Change-Id: I6066da1b5a1ddf5af265944a31ed298297b4f2e1
--
2d6885f78481f04e0e7ee86060aec15b677144f3 by Abseil Team <absl-team@google.com>:
Internal change
PiperOrigin-RevId: 438378389
Change-Id: If70dd9114114eb44e85afccd521e7fb7e1436b88
--
7f8282ddee7fcd032e01cbfe65c11c2d166cceb8 by Derek Mauro <dmauro@google.com>:
Internal change
PiperOrigin-RevId: 438374554
Change-Id: I993367952af1dc83bd5aa0ae19a64c024f457fdd
--
ce65ba28f6031e45db8fa5118a05410f5166fd7a by Abseil Team <absl-team@google.com>:
Spelling gardening: Heterogeneous has an "e" after the "n".
PiperOrigin-RevId: 438374411
Change-Id: If1a9098a5d04338837998883739c7b555efa62b4
GitOrigin-RevId: b984c7c1cbee4253192c833046bfcfa16dca8ccf
--
291f7ef542f73e4801ab5108014bc02344ef31df by Derek Mauro <dmauro@google.com>:
Internal change
PiperOrigin-RevId: 437835981
Change-Id: I42fd92e74903894533ac9984d7f622e3ba20f468
--
2e8caf1a57c50b518e05b4bca48e4fe1bb19af82 by Andy Getzendanner <durandal@google.com>:
Internal change
PiperOrigin-RevId: 437832673
Change-Id: I61b35089418d01a54cecf161b254b68252bebff3
--
b927482ccc399f7e337b60582988b914d9946e4e by Derek Mauro <dmauro@google.com>:
Simplify endian intrinsics for modern compilers
All modern compilers have either __builtin_bswapN (gcc, clang) or
_byteswap_TYPE (MSVC). The other intrinsic definitions are no longer
necessary.
PiperOrigin-RevId: 437772295
Change-Id: Ifb3d88ba24b9097f87ceb202272b36d2f5e5117f
--
b6782a2247a16d5c14706a74ec577c19963d9f97 by Derek Mauro <dmauro@google.com>:
Internal change
PiperOrigin-RevId: 437373174
Change-Id: I0f77e1780dee90d7a3c32a08d96c4aeb624a57b4
--
a53e0c724e37b0b01515a99bd25394b8e21ffdfc by Derek Mauro <dmauro@google.com>:
Unify detection of SSE2 and SSSE3 instruction sets and
include the proper headers
Fix the intrinsic implementation of FastHexToBufferZeroPad16 in
numbers.h which only relies on SSSE3, not SSE 4.2.
https://godbolt.org/z/Pf5bn1Yv9Closes#639
PiperOrigin-RevId: 437286940
Change-Id: Ic97948399b61b91e9c0bccd09313b795b904d714
--
f173f597cb2a75ef2a989f45a496334b85e6f40d by Abseil Team <absl-team@google.com>:
Change assertion function to enable clearer error messages.
PiperOrigin-RevId: 437227057
Change-Id: If420d2f63b51feef6648762f344d5be012cd9c85
GitOrigin-RevId: 291f7ef542f73e4801ab5108014bc02344ef31df
ARM64EC is a Microsoft-designed ARM64 ABI compatible with AMD64
applications on ARM64 Windows 11. The ARM64EC does not support
_umul128 and __rdtsc as x64 intrinsics, though it provides inline
function implementations for them, by emulation. Since the code
already has portable code paths without using the intrinsics,
instead of using the emulated intrinsic implementations, we use
the said portable code paths for ARM64EC.
--
399d051d30f7a78c367bb1dc08829ffacbb619a6 by Abseil Team <absl-team@google.com>:
Fix a glitch in symbolization which could result in the same address being
correctly symbolized and "(unknown)" in the same crash report.
PiperOrigin-RevId: 435371003
Change-Id: I9f6a5684144be6d3d366584601d79fda9eefdce6
--
5dad813de52773e0bb09c6b2351e1bbadb53deac by Abseil Team <absl-team@google.com>:
Fix ABSL_HAVE_MMAP check in direct_mmap.h
This change makes the check for ABSL_HAVE_MMAP match the other checks
in absl. This fixes builds where ABSL_HAVE_MMAP is not defined.
PiperOrigin-RevId: 435190242
Change-Id: I11638ef315849cafcf4ea1611eee1a98c80e7dcb
GitOrigin-RevId: 399d051d30f7a78c367bb1dc08829ffacbb619a6
--
5dc885f2b62993bccf33a3f3b99f7e460c819c89 by Derek Mauro <dmauro@google.com>:
Remove the internal-only ABSL_INTERNAL_ASSUME now that ABSL_ASSUME
is available and ABSL_INTERNAL_ASSUME has no more users.
Improve the documentation to ABSL_ASSUME somewhat.
PiperOrigin-RevId: 434803125
Change-Id: I7c27418463ffc1c7e10ecd50e2d17f348f686af7
--
4aea19a0ef596228c9136a4c2446e6f25085f23c by Derek Mauro <dmauro@google.com>:
Update documentation to warn against using absl::Hash across
dynamically loaded libraries
Fixes#1128
PiperOrigin-RevId: 434723247
Change-Id: Ib0c7ba03b2cab98b42e19e85be6833192d4b4067
GitOrigin-RevId: 5dc885f2b62993bccf33a3f3b99f7e460c819c89
--
d3b99682554d339c42556680f4d65f83226005e2 by Martijn Vels <mvels@google.com>:
Inline CycleClock code and remove branch for x86 CycleClockSource function
This CL removes the relaxed load for x86 as there is no acquire price to pay on x86. It inlines the UnscaledCycleClock::Now() which is a single RTDSC op for x86, and likewise inlines CycleClock::Now() for x86. The inlining should mostly have secondary benefits such as reducing spills on outlined calls.
LTO may eventually hoist these functions inline for the hotspots, but it doesn't hurt to default inline this for all builds and let the compiler decide on the first pass.
The perlab benchmark is noisy for the plain BM_Now, but the other benchmarks and the run on my local machine are clear.
------------- Local Benchy Benchmark
name old cpu/op new cpu/op delta
BM_Now 3.41ns ± 1% 2.30ns ± 2% -32.52% (p=0.000 n=50+50)
BM_NowWithRegisterPresure 4.96ns ± 2% 4.19ns ± 2% -15.57% (p=0.000 n=56+55)
BM_NowWithCallback 3.30ns ± 2% 1.91ns ± 2% -42.00% (p=0.000 n=47+60)
------------- Perflab Benchy Benchmark
name old cpu/op new cpu/op delta
BM_Now 8.20ns ±13% 4.32ns ±83% ~ (p=0.413 n=4+5)
BM_NowWithRegisterPresure 7.91ns ± 1% 3.68ns ± 2% -53.45% (p=0.029 n=4+4)
BM_NowWithCallback 2.66ns ±13% 1.58ns ± 0% -40.51% (p=0.008 n=5+5)
PiperOrigin-RevId: 434474766
Change-Id: I991d987ae9233e50f09606c874055cf4c5a56300
--
b38330686a0af176a2679163e4d2fa1b90e2f667 by Laramie Leavitt <lar@google.com>:
Style, comment, and test updates
* Remove a redundant assert in uniform_real_distribution.
* Update comment in internal/generate_real.h
* Style updates to uniform_real_distribution_test
mainly replacing TypeParam with real_type, using aliases for some limits, etc.
* Add a few more minor tests.
PiperOrigin-RevId: 433902174
Change-Id: Id75be8e24be2fb8f6aea05feec13e3ef320a7254
--
ab2da6047ff7f5dae3add3779fcddf73b03feabf by Abseil Team <absl-team@google.com>:
Remove declaration of method whose definition was previously removed.
PiperOrigin-RevId: 433507828
Change-Id: I0130b689813125250f7de2664e767e181f676c89
--
df0c87f4ec2c010691931c1bef9d26470a6e63a2 by Derek Mauro <dmauro@google.com>:
Internal change
PiperOrigin-RevId: 433289136
Change-Id: Iba157dc83ed99dafd17a2223d2504e49f8afbb9e
--
7445fa312f2995772900eda82467325b3401a17d by Martijn Vels <mvels@google.com>:
Optimize CordReader logic now that CONCAT is removed
This CL cleans up various helper functions and logic remaining from previous complex CONCAT logic that is no longer needed, simplifying the CordReader logic.
PiperOrigin-RevId: 433208748
Change-Id: I5f7b1883573c44e7c6f8af12c3cddbd197cb134d
GitOrigin-RevId: d3b99682554d339c42556680f4d65f83226005e2
Derek Mauro
Abseil Team
Kim Hyun
Evan Brown
Andy Getzendanner
Fabrice Fontaine
Dino Radakovic
James Y Knight
Tom Rybka
Greg Falcon
Calvin Ke
Ben Niu
Thomas Klausner