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https://issues.apache.org/jira/browse/HADOOP-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065609#comment-13065609
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Kihwal Lee commented on HADOOP-7446:
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It's probably better to use autoconf and automake to figure out the build
target architecture.
We could add AC_CANONICAL_HOST to the autoconf.in and have the cpu arch info
passed when compiling.
One way is to add -DCPU_ARCH=$(host_cpu) to AM_CFLAGS or AM_CPPFLAGS in
Makefile.am.
Or will it make more sense to use $OS_ARCH provided by build.xml?
> Implement CRC32C native code using SSE4.2 instructions
> ------------------------------------------------------
>
> Key: HADOOP-7446
> URL: https://issues.apache.org/jira/browse/HADOOP-7446
> Project: Hadoop Common
> Issue Type: Improvement
> Components: native
> Reporter: Todd Lipcon
> Attachments: hadoop-7446.txt
>
>
> Once HADOOP-7445 is implemented, we can get further performance improvements
> by implementing CRC32C using the hardware support available in SSE4.2. This
> support should be dynamically enabled based on CPU feature flags, and of
> course should be ifdeffed properly so that it doesn't break the build on
> architectures/platforms where it's not available.
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