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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - CLFLUSH requires HasSSE2 but instruction availability isn't connected to SSE2"
href="http://llvm.org/bugs/show_bug.cgi?id=18665">18665</a>
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<th>Summary</th>
<td>CLFLUSH requires HasSSE2 but instruction availability isn't connected to SSE2
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sschiffli@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>In lib\Target\X86\X86InstrSSE.td the CLFLUSH instruction is declared with
Requires<[HasSSE2]>, but if you read the Intel instruction manual of CLFLUSH it
says the following:
"The CLFLUSH instruction was introduced with the SSE2 extensions; however,
because it has its own CPUID feature flag, it can be implemented in IA-32
processors that do not include the SSE2 extensions. Also, detecting the
presence of the SSE2 extensions with the CPUID instruction does not guarantee
that the CLFLUSH instruction is implemented in the processor."
I believe a new X86Subtarget feature flag should be implemented which
determines the availability of CLFLUSH.</pre>
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</p>
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