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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64] print "uxtl" simplified mnemonic asm"
href="https://bugs.llvm.org/show_bug.cgi?id=39721">39721</a>
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<th>Summary</th>
<td>[AArch64] print "uxtl" simplified mnemonic asm
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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>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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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>spatel+llvm@rotateright.com
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, peter.smith@linaro.org, Ties.Stuij@arm.com
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<p>
<div>
<pre>As noted in <a href="https://reviews.llvm.org/D54392">https://reviews.llvm.org/D54392</a> :
define <8 x i16> @uxtl(<8 x i8> %a) {
%r = zext <8 x i8> %a to <8 x i16>
ret <8 x i16> %r
}
$ llc -o - uxtl.ll -mtriple=aarch64
ushll v0.8h, v0.8b, #0
ret
The ARM ARM says:
"UXTL{2} <Vd>.<Ta>, <Vn>.<Tb>
is equivalent to
USHLL{2} <Vd>.<Ta>, <Vn>.<Tb>, #0
and is the preferred disassembly..."</pre>
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