Wes McKinney created ARROW-8166:
-----------------------------------
Summary: [C++] AVX512 intrinsics fail to compile with clang-8 on
Ubuntu 18.04
Key: ARROW-8166
URL: https://issues.apache.org/jira/browse/ARROW-8166
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Wes McKinney
Fix For: 0.17.0
cc [~frank.du]
I have an i9-9960X AVX512-capable process but I see
{code}
/usr/bin/ccache /usr/bin/clang++-8 -DARROW_EXTRA_ERROR_CONTEXT -DARROW_HDFS
-DARROW_JEMALLOC -DARROW_JEMALLOC_INCLUDE_DIR="" -DARROW_NO_DEPRECATED_API
-DARROW_USE_SIMD -DARROW_WITH_BROTLI -DARROW_WITH_BZ2 -DARROW_WITH_LZ4
-DARROW_WITH_SNAPPY -DARROW_WITH_TIMING_TESTS -DARROW_WITH_ZLIB
-DARROW_WITH_ZSTD -DURI_STATIC_BUILD -Isrc -I../src -I../src/generated -isystem
../thirdparty/flatbuffers/include -isystem /home/wesm/cpp-toolchain/include
-isystem jemalloc_ep-prefix/src -isystem ../thirdparty/hadoop/include
-Qunused-arguments -fcolor-diagnostics -fuse-ld=gold -ggdb -O0 -Wall -Wextra
-Wdocumentation -Wno-missing-braces -Wno-unused-parameter
-Wno-unknown-warning-option -Wno-constant-logical-operand -Werror
-Wno-unknown-warning-option -march=skylake-avx512 -maltivec
-fno-omit-frame-pointer -g -fPIE -pthread -std=gnu++11 -MD -MT
src/arrow/util/CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o -MF
src/arrow/util/CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o.d -o
src/arrow/util/CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o -c
../src/arrow/util/rle_encoding_test.cc
In file included from ../src/arrow/util/rle_encoding_test.cc:33:
In file included from ../src/arrow/util/bit_stream_utils.h:28:
../src/arrow/util/bpacking.h:49:5: error: use of undeclared identifier
'__m512i_u'
*(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
^
../src/arrow/util/bpacking.h:49:15: error: expected expression
*(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
^
../src/arrow/util/bpacking.h:55:5: error: use of undeclared identifier
'__m512i_u'
*(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
^
../src/arrow/util/bpacking.h:55:15: error: expected expression
*(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
^
4 errors generated.
{code}
I tried compiling with gcc 8.3 instead of clang-8 and it worked. So it seems
that because the base gcc toolchain on Ubuntu 18.04 is gcc 7.x that the clang-*
versions are using the gcc-7 toolchain headers. Evidently we will need to make
this more robust
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