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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [RISCV] Improve gorc2 detection"
href="https://bugs.llvm.org/show_bug.cgi?id=51209">51209</a>
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<th>Summary</th>
<td>[RISCV] Improve gorc2 detection
</td>
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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
</td>
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<th>Status</th>
<td>NEW
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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: RISC-V
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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>asb@lowrisc.org, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>As encountered on D77804, the gorc2 matching (and the gorc2, gorc2 -> gorc2
combines) are incredibly brittle.
llvm/test/CodeGen/RISCV/rv32zbp.ll
llvm/test/CodeGen/RISCV/rv64zbp.ll
The gorc2, gorc2 -> gorc2 tests that D77804 breaks aren't likely to occur as
InstCombine will already optimize the IR in a similar manner, preventing the
match.</pre>
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