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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Remove some/all of the X86ISD double shift opcodes"
href="https://bugs.llvm.org/show_bug.cgi?id=40281">40281</a>
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<th>Summary</th>
<td>Remove some/all of the X86ISD double shift opcodes
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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>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</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>llvm-dev@redking.me.uk
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<p>
<div>
<pre>For X86ISD::VSHLDV/VSHRDV we should be able to use the ISD::FSHL/FSHR opcodes
directly, including the isel patterns.
The immediate X86ISD::VSHLD/VSHRD opcodes will probably have to stay - although
I did wonder if it'd be useful to merge these with the scalar X86ISD::SHLD/SHRD
opcodes?
NOTE: I can't see a way to get rid of the X86ISD::SHLD/SHRD opcodes while we
still need to handle the i16 (no modulo) special case, although I suppose it
doesn't stop us using the ISD::FSHL/FSHR opcodes directly for i32/i64 if its
useful?</pre>
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