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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AArch64 MachineCombine] Enhance/Add support for general reassociation to reduce the critical path"
href="https://llvm.org/bugs/show_bug.cgi?id=24522">24522</a>
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<th>Summary</th>
<td>[AArch64 MachineCombine] Enhance/Add support for general reassociation to reduce the critical path
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mcrosier@codeaurora.org
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<th>CC</th>
<td>gberry@codeaurora.org, james.molloy@arm.com, kristof.beyls@arm.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<th>Classification</th>
<td>Unclassified
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<pre>The x86 target supports general reassociation optimizations in the machine
combiner. We should support/extend the same type of optimization for AArch64.
Here are a few of the related commits (not necessarily all inclusive):
r239486: [x86] Add a reassociation optimization to increase ILP via the
MachineCombiner pass
r240361: [x86] generalize reassociation optimization in machine combiner to 2
instructions
r241515: [x86] extend machine combiner reassociation optimization to SSE scalar
adds
r241752: [x86] enable machine combiner reassociations for scalar
single-precision multiplies
r241871: [x86] enable machine combiner reassociations for scalar
double-precision adds
IIRC, this might improve the performance of 188.ammp.</pre>
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