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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64][AArch64LoadStoreOptimizer][DebugInfo] load store optimizer generates different code when debug info present"
href="https://bugs.llvm.org/show_bug.cgi?id=37271">37271</a>
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<th>Summary</th>
<td>[AArch64][AArch64LoadStoreOptimizer][DebugInfo] load store optimizer generates different code when debug info present
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>6.0
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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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>gberry@codeaurora.org
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<th>CC</th>
<td>chad.rosier@gmail.com, dblaikie@gmail.com, francisvm@yahoo.com, junbuml@codeaurora.org, llvm-bugs@lists.llvm.org, t.p.northover@gmail.com
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<pre>In the following test, the presence of the DBG_VALUE will prevent the loads
from being paired. The AArch64LoadStoreOptimizer should treat DBG_VALUE
instructions specially since e.g. they can be moved down with the newly paired
load in this case.
See <a href="https://reviews.llvm.org/D45878">https://reviews.llvm.org/D45878</a> for similar DBG_VALUE handling in
MachineCopyPropagation.
Test case:
# RUN: llc -mtriple=aarch64 -run-pass aarch64-ldst-opt -verify-machineinstrs -o
- %s | FileCheck %s
---
name: test_LDdbg
body: |
bb.0.entry:
liveins: $x0, $x3
$x1 = LDRXui $x0, 0 :: (load 8)
DBG_VALUE debug-use $x1, debug-use $noreg
$x2 = ADDXri $x3, 1, 0
$x3 = LDRXui $x0, 1 :: (load 8)
RET_ReallyLR implicit $x1</pre>
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