Dan Hecht 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)) { > So TESTL is cheaper than cmp eax, 1? "const" doesn't make something a compile time constant. It just means that once initialized, it won't change (unless const is cast away). Maybe you are thinking of "static const"., but this field is not a compile time constant. It depends on what CPU we're running on which is only known at runtime. It is a code-gen time constant, however, which is why I said it can later be optimized via code-gen. -- To view, visit http://gerrit.cloudera.org:8080/3338 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: comment Gerrit-Change-Id: I6fef4f6652876f8fd7e3f0e41431702380418c98 Gerrit-PatchSet: 7 Gerrit-Project: Impala Gerrit-Branch: cdh5-trunk Gerrit-Owner: Jim Apple <[email protected]> Gerrit-Reviewer: Dan Hecht <[email protected]> Gerrit-Reviewer: Jim Apple <[email protected]> Gerrit-Reviewer: Mostafa Mokhtar <[email protected]> Gerrit-Reviewer: Tim Armstrong <[email protected]> Gerrit-HasComments: Yes
