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<div class="moz-cite-prefix">On 2/14/2018 1:05 PM, Greg McGary
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABFwY94ZUqULLebro4uj1S2hoQNgC139PaKM8sxMUDo6qeV0bQ@mail.gmail.com">
<div dir="ltr">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Feb 14, 2018 at 12:44 PM,
Friedman, Eli <span dir="ltr"><<a
href="mailto:efriedma@codeaurora.org" target="_blank"
moz-do-not-send="true">efriedma@codeaurora.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
There are three forms of vld1.64 which load two registers
(encoding comments generated using "llvm-mc --arch=arm
-mattr=+neon -show-encoding"):<br>
<br>
vld1.64 {d16, d17}, [r2]! @ encoding:
[0xcd,0x0a,0x62,0xf4]<br>
vld1.64 {d16, d17}, [r2:64]! @ encoding:
[0xdd,0x0a,0x62,0xf4]<br>
vld1.64 {d16, d17}, [r2:128]! @ encoding:
[0xed,0x0a,0x62,0xf4]<br>
<br>
The first requires no alignment, the second requires
64-bit alignment, the third requires 128-bit alignment.</blockquote>
<div><br>
</div>
<div>I see the first form (no alignment) from "clang -S ..."</div>
<div>When I compile to object via "clang -c ...", subsequent
disassembly shows the third form (128-bit alignment).</div>
<div>What's up with that?</div>
</div>
</div>
</div>
</blockquote>
<br>
I can't reproduce that; compiling and disassembling your testcase
with clang and arm-linux-androideabi-objdump from NDK version r15c,
I get the expected disassembly without the alignment specifier.<br>
<br>
-Eli<br>
<pre class="moz-signature" cols="72">--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>
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