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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing optimization for sibling address"
href="https://bugs.llvm.org/show_bug.cgi?id=50414">50414</a>
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<th>Summary</th>
<td>Missing optimization for sibling address
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: AArch64
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>zhongyunde@tom.com
</td>
</tr>
<tr>
<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
</td>
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<p>
<div>
<pre>cat test.c
extern double top[100];
int foo (long long j, double a) {
top[j] += a;
return 0;
}
clang12 test.c -O3 -Wall --std c89 -S -o clang.s
foo: // @foo
.cfi_startproc
// %bb.0: // %entry
adrp x9, top
lsl x8, x0, #3 -- redundant
add x9, x9, :lo12:top
ldr d1, [x9, x8] --> ldr d1, [x9, x0, lsl 3]
mov w0, wzr
fadd d0, d1, d0
str d0, [x9, x8] --> str d0, [x9, x0, lsl 3]
ret</pre>
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