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From "Mostafa Mokhtar (Code Review)" <ger...@cloudera.org>
Subject [Impala-CR](cdh5-trunk) Use AVX2 operations to speedup Bloom filters by 10-100%.
Date Thu, 16 Jun 2016 02:41:22 GMT
Mostafa Mokhtar has posted comments on this change.

Change subject: Use AVX2 operations to speedup Bloom filters by 10-100%.
......................................................................


Patch Set 7:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/3338/7/be/src/util/bloom-filter.h
File be/src/util/bloom-filter.h:

Line 176:   if (CpuInfo::IsSupported(CpuInfo::AVX2)) {
> There should be no cost difference.  IsSupported is just a bit-test which i
So TESTL is cheaper than cmp eax, 1?
Why would the const boolean not get read from the register? can't the compiler optimize that?


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Gerrit-MessageType: comment
Gerrit-Change-Id: I6fef4f6652876f8fd7e3f0e41431702380418c98
Gerrit-PatchSet: 7
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Jim Apple <jbapple@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhecht@cloudera.com>
Gerrit-Reviewer: Jim Apple <jbapple@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokhtar@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstrong@cloudera.com>
Gerrit-HasComments: Yes

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