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https://issues.apache.org/jira/browse/HADOOP-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083968#comment-13083968
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Tsz Wo (Nicholas), SZE commented on HADOOP-7446:
------------------------------------------------
In the code below, rbx should be ebx.
{code}
+ asm("pushq %%rbx\n\t" /* save %rbx */
+ "cpuid\n\t"
+ "movl %%ebx, %[ebx]\n\t" /* save what cpuid just put in %ebx */
+ "popq %%rbx" : "=a"(eax), [ebx] "=r"(ebx), "=c"(ecx), "=d"(edx) : "a"
(eax_in)
{code}
> 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
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.23.0
>
> Attachments: hadoop-7446.txt, 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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