pitrou commented on a change in pull request #10550:
URL: https://github.com/apache/arrow/pull/10550#discussion_r655195574
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File path: cpp/src/arrow/compute/kernels/hash_aggregate.cc
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@@ -442,6 +442,9 @@ struct GrouperImpl : Grouper {
};
struct GrouperFastImpl : Grouper {
+ static constexpr int kBitmapPaddingForSIMD = 64; // bits
+ static constexpr int kPaddingForSIMD = 32; // bytes
Review comment:
Unfortunately I have no idea why precisely though values. Perhaps
@michalursa can tell.
##########
File path: cpp/src/arrow/compute/kernels/hash_aggregate.cc
##########
@@ -442,6 +442,9 @@ struct GrouperImpl : Grouper {
};
struct GrouperFastImpl : Grouper {
+ static constexpr int kBitmapPaddingForSIMD = 64; // bits
+ static constexpr int kPaddingForSIMD = 32; // bytes
Review comment:
Unfortunately I have no idea why precisely those values. Perhaps
@michalursa can tell.
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