[Impala-CR](cdh5-trunk) IMPALA-2809: Improve ByteSwap with builtin function or SSSE3 or AVX2.

["Youwei Wang (Code Review)" <ge...@cloudera.org>]

Youwei Wang has uploaded a new patch set (#18).

Change subject: IMPALA-2809: Improve ByteSwap with builtin function or SSSE3 or AVX2.
......................................................................

IMPALA-2809: Improve ByteSwap with builtin function or SSSE3 or AVX2.

Using SSSE3/AVX2 intrinsic to accelerate the function
"static inline void ByteSwap(void* dst, const void* src, int len)" of BitUtil class,
and a scalar byte-swap routine is added as fallback.
Also the runtime selector for CPUs of different capacity is included,
as well as performance test and data verification.
Brief performance comparison is listed here:
CPU: Intel(R) Core(TM) i5-4460  CPU@3.20GHz
Result:
Old Impala:    1X
Faster Scala:  1.021X
SSSE3:         10.59X
AVX2:          25.78X
SIMD:          24.86X

Change-Id: I392ed5a8d5683f30f161282c228c1aedd7b648c1
---
M be/src/benchmarks/CMakeLists.txt
A be/src/benchmarks/bswap-benchmark.cc
M be/src/exprs/string-functions-ir.cc
M be/src/util/bit-util-test.cc
M be/src/util/bit-util.inline.h
M be/src/util/cpu-info.cc
M be/src/util/cpu-info.h
7 files changed, 387 insertions(+), 31 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/81/3081/18
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I392ed5a8d5683f30f161282c228c1aedd7b648c1
Gerrit-PatchSet: 18
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Youwei Wang <yo...@intel.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>
Gerrit-Reviewer: Jim Apple <jb...@cloudera.com>
Gerrit-Reviewer: Marcel Kornacker <ma...@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mm...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-Reviewer: Youwei Wang <yo...@intel.com>