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View Code? Open in Web Editor NEWSIMD (SSE) population count --- http://0x80.pl/articles/sse-popcount.html
License: BSD 2-Clause "Simplified" License
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miyuki advanpix michaelangel007 pombredanne mfkiwl simonlindholm dryman eppie jkflying lemire shadercoder cloudswenable liyancas wzkg2012 seancmonahan ralucabolba limin2021 elliskui kazuki sgtvincent hongxinggao mindis leepro woowenjie dnvtmf michaeljclark dendisuhubdy gaoyiyeah berlach kimwalisch gygzhang 5l1v3r1 d3v3l0 spch2008 stjordanis clayne is8ac jgcodes2020 lilu-guo fanxu lxq2t gevarakelyan aganm gsuberland zzjzhijun ashvardanian gerhobbeltsse-popcount's Issues
Harleay-Seal AVX2 produces wrong results
Verify failed
AVX2 build is now broken on GCC 4.9.2
GCC 5.3.1 works fine.
popcnt_SSE_bit_parallel, popcnt_AVX2_lookup, popcnt_parallel_64bit_optimized
Recreate old versions(without manual unrolling, using the loop I've described in the article. Just for sake of completeness.
Cannot compile popcnt-avx2-harley-seal.cpp using MSVC 2015
Hi Wojciech,
I use your popcnt-avx2-harley-seal algorithm in my libpopcnt.h. Unfortunately it fails to compile on Windows using a recent MSVC 2015 compiler version:
C:\Users\kim\Desktop\libpopcnt-master>nmake -f Makefile.msvc
Microsoft (R) Program Maintenance Utility Version 14.00.24210.0
Copyright (C) Microsoft Corporation. All rights reserved.
cl /nologo /W3 /O2 /EHsc /D HAVE_POPCNT /arch:AVX2 /D HAVE_AVX2 test.cpp /Fotest.obj /Fetest.exe
test.cpp
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(356): error C2676: binary '&': '__m256i' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(356): error C2660: '_mm256_sub_epi8': function does not take 1 arguments
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(357): error C2676: binary '&': '__m256i' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(357): error C2088: '&': illegal for union
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(357): error C2660: '_mm256_add_epi8': function does not take 1 arguments
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(358): error C2676: binary '&': '__m256i' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(369): error C2676: binary '^': '__m256i' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(370): error C2676: binary '&': '__m256i' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(370): error C2088: '&': illegal for union
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(371): error C2676: binary '^': '__m256i' does not define this operator or a conversion to a type acceptable to the predefined operator
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(423): error C3861: '_mm256_extract_epi64': identifier not found
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(424): error C3861: '_mm256_extract_epi64': identifier not found
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(425): error C3861: '_mm256_extract_epi64': identifier not found
c:\users\kim\desktop\libpopcnt-master\libpopcnt.h(426): error C3861: '_mm256_extract_epi64': identifier not found
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\cl.EXE"' : return code '0x2'
Stop.
It seems like the MSVC compiler has poor AVX2 support (e.g. the _mm256_extract_epi64 intrinsic seems to be missing)!? Have you ever tried compiling your sse-popcount project using MSVC?
Here is a link to my libpopcnt.h
Thanks,
Kim
missing include cstdio in files verfiy.cpp and speed.cpp
Problem spotted in the cygwin environment.
builtin-popcnt-movdq-unrolled_manual produces wrong results
At least verify utility reports error.
AVX2 & popcnt mix
Use AVX2 instructions to load data, then use YMM registers as a source for popcnt instructions. I'm curious how fast it will be.
SSE Harley-Seal popcount algorithm
Add an SSE version of HS algorithm, as @kimwalisch suggested.
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