<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It looks like everything is currently broken on AArch64, because function return generation is hitting<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">an assert. I’ve posted D53074 to fix that.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">With that fixed instructions that use only X and W registers will work. Almost anything that uses an<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">immediate won’t work, because the AArch64 backend uses a lot of custom immediate operand types<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">that aren’t marked OPERAND_IMMEDIATE (which means you get the “has unknown operands” error).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Luka Ercegovcevic [mailto:Luka.Ercegovcevic@rt-rk.com]
<br>
<b>Sent:</b> 09 October 2018 12:27<br>
<b>To:</b> Clement Courbet<br>
<b>Cc:</b> llvm-dev; John Brawn<br>
<b>Subject:</b> Re: llvm-exegesis on AArch64 architecture<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Could you take a look at this?<br>
<br>
-------- Original Message --------<br>
Subject: Re: llvm-exegesis on AArch64 architecture<br>
Date: Friday, September 21, 2018 16:24 CEST<br>
From: Clement Courbet <courbet@google.com><br>
To: Luka Ercegovcevic <Luka.Ercegovcevic@rt-rk.com><br>
CC: llvm-dev <llvm-dev@lists.llvm.org>, Clement Courbet <courbet@google.com>, john.brawn@arm.com<br>
References: <5e72-5ba4fd80-1b-52e52880@202407086><br>
<br>
<br>
<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">Hi <span style="background:white">Luka,</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="background:white">I don't have access to and </span><span style="font-size:9.5pt;background:white">AArch64 machine unfortunately.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">I'm adding John Brawn who implemented experimental support for <span style="font-size:9.5pt">AArch64.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<p class="MsoNormal">On Fri, Sep 21, 2018 at 4:17 PM, Luka Ercegovcevic <<a href="mailto:Luka.Ercegovcevic@rt-rk.com" target="_blank">Luka.Ercegovcevic@rt-rk.com</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal"> Hi everyone,<br>
<br>
I can't find for which opcode llvm-exegesis works on AArch64. I have used bash script from the official site that testing all opcodes for X86 architecture and I changed script to test AArch64 opcodes and there is no working case.<br>
There are some errors: <br>
Assertion for AArch64CallLowering::lowerReturn, <br>
setRegTo is not implemented, results will be unreliable, <br>
Infeasible : has unknown operands, <br>
Infeasible : Didn't find any scheme to make the instruction serial, <br>
Unsupported opcode: isPseudo. <br>
Unsupported opcode: isBranch/isIndirectBranch<br>
Unsupported opcode: isCall/isReturn<br>
<br>
I'm using llvm trunk (native build for AARCH64), am I missing something? <br>
<br>
Thanks!<o:p></o:p></p>
</div>
</div>
</div>
<p class="MsoNormal"><br>
<o:p></o:p></p>
</div>
</div>
</body>
</html>