<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)">
<base href="https://bugs.llvm.org/"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@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;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
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;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;
color:black;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1651862406;
mso-list-template-ids:2005707552;}
@list l0:level1
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:.5in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Symbol;}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:1.0in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:"Courier New";
mso-bidi-font-family:"Times New Roman";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:1.5in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:2.0in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:2.5in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:3.0in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:3.5in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:4.0in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:;
mso-level-tab-stop:4.5in;
mso-level-number-position:left;
text-indent:-.25in;
mso-ansi-font-size:10.0pt;
font-family:Wingdings;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></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 bgcolor="white" lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Either the register copy was introduced with no debug info, or the debug info got lost along the way.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My first thought would be to use –print-after-all (or however that's spelled) and look for the pass where the problem first appears. You could start with opt,
to eliminate the IR passes, then use llc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></a></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> llvm-dev [mailto:llvm-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Victor Leschuk via llvm-dev<br>
<b>Sent:</b> Monday, August 27, 2018 5:44 AM<br>
<b>To:</b> Robinson, Paul<br>
<b>Cc:</b> LLVM Dev<br>
<b>Subject:</b> Re: [llvm-dev] [llvm-bugs] [Bug 38714] [DebugInfo] [DWARF] [AArch64] .debug_loc entry missing in optimized build on aarch64<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Including Paul and llvm-dev.<o:p></o:p></p>
<div>
<p class="MsoNormal">On 8/27/18 12:31 PM, Victor Leschuk wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p>David, Adrian, could you please advise on this one?<o:p></o:p></p>
<div>
<p class="MsoNormal">On 8/27/18 12:24 PM, via llvm-bugs wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Bug ID<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal"><a href="https://bugs.llvm.org/show_bug.cgi?id=38714" title="NEW
-
[DebugInfo] [DWARF] [AArch64] .debug_loc entry
missing
in optimized build on aarch64">38714</a>
<o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Summary<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">[DebugInfo] [DWARF] [AArch64] .debug_loc entry missing in optimized build on aarch64
<o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Product<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">new-bugs <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Version<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">trunk <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Hardware<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">PC <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>OS<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">Linux <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Status<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">NEW <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Severity<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">normal <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Priority<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">P <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Component<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal">new bugs <o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Assignee<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal"><a href="mailto:unassignedbugs@nondot.org">unassignedbugs@nondot.org</a>
<o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>Reporter<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal"><a href="mailto:vleschuk@accesssoftek.com">vleschuk@accesssoftek.com</a>
<o:p></o:p></p>
</td>
</tr>
<tr>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal" align="center" style="text-align:center"><b>CC<o:p></o:p></b></p>
</td>
<td style="padding:4.8pt 4.8pt 4.8pt 4.8pt">
<p class="MsoNormal"><a href="mailto:llvm-bugs@lists.llvm.org">llvm-bugs@lists.llvm.org</a>
<o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<div>
<pre>Created <a name="attach_20771"></a><a href="attachment.cgi?id=20771" title="Source, object file and generated assembly.">attachment 20771</a> <a href="attachment.cgi?id=20771&action=edit" title="Source, object file and generated assembly.">[details]</a><o:p></o:p></pre>
<pre>Source, object file and generated assembly.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>When compiling the following sample with optimizations enabled (-O1 and higher)<o:p></o:p></pre>
<pre>it looks like a .debug_loc entry is missing for argc:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>#include <stdio.h><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>int main( int argc, char **argv )<o:p></o:p></pre>
<pre>{<o:p></o:p></pre>
<pre> for(int i = 1; i < argc; ++i) {<o:p></o:p></pre>
<pre> printf("Argument %d: %s\n", i, argv[i]);<o:p></o:p></pre>
<pre> }<o:p></o:p></pre>
<pre> return 0;<o:p></o:p></pre>
<pre>}<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>$ clang -target aarch64-unknown-linux -c -g -O1 -o test.o test.c<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>There are the following entries:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>0x00000043: DW_TAG_formal_parameter [3] <o:p></o:p></pre>
<pre> DW_AT_location [DW_FORM_sec_offset] (0x00000000<o:p></o:p></pre>
<pre> [0x0000000000000000, 0x0000000000000034): DW_OP_reg0 W0)<o:p></o:p></pre>
<pre> DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000d5] =<o:p></o:p></pre>
<pre>"argc")<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>0x00000052: DW_TAG_formal_parameter [3] <o:p></o:p></pre>
<pre> DW_AT_location [DW_FORM_sec_offset] (0x00000023<o:p></o:p></pre>
<pre> [0x0000000000000000, 0x0000000000000020): DW_OP_reg1 W1<o:p></o:p></pre>
<pre> [0x0000000000000020, 0x0000000000000048): DW_OP_reg19<o:p></o:p></pre>
<pre>W19)<o:p></o:p></pre>
<pre> DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000da] =<o:p></o:p></pre>
<pre>"argv")<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>The assembly for the code is the following:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre> //DEBUG_VALUE: main:argc <- $w0<o:p></o:p></pre>
<pre> //DEBUG_VALUE: main:argv <- $x1<o:p></o:p></pre>
<pre>.Ltmp0:<o:p></o:p></pre>
<pre> //DEBUG_VALUE: i <- 1<o:p></o:p></pre>
<pre> .loc 1 5 3 prologue_end // test.c:5:3<o:p></o:p></pre>
<pre> cmp w0, #2 // =2<o:p></o:p></pre>
<pre> b.lt .LBB0_3<o:p></o:p></pre>
<pre>.Ltmp1:<o:p></o:p></pre>
<pre>// %bb.1: // %for.body.preheader<o:p></o:p></pre>
<pre> //DEBUG_VALUE: main:argv <- $x1<o:p></o:p></pre>
<pre> //DEBUG_VALUE: main:argc <- $w0<o:p></o:p></pre>
<pre> .loc 1 0 3 is_stmt 0 // test.c:0:3<o:p></o:p></pre>
<pre> adrp x21, .L.str<o:p></o:p></pre>
<pre> mov x19, x1<o:p></o:p></pre>
<pre>.Ltmp2:<o:p></o:p></pre>
<pre> //DEBUG_VALUE: main:argv <- $x19<o:p></o:p></pre>
<pre> mov w22, w0<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>It looks like there should be two DW_OP_reg* records for w0 and for w22 for<o:p></o:p></pre>
<pre>argc.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Correct me if I am wrong.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>PS x86 doesn't seem to have this problem.<o:p></o:p></pre>
</div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="3" width="100%" align="center">
</div>
<p class="MsoNormal">You are receiving this mail because: <o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
You are on the CC list for the bug.<o:p></o:p></li></ul>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>llvm-bugs mailing list<o:p></o:p></pre>
<pre><a href="mailto:llvm-bugs@lists.llvm.org">llvm-bugs@lists.llvm.org</a><o:p></o:p></pre>
<pre><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs</a><o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre>Best Regards,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Victor Leschuk | Software Engineer | Access Softek<o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre>Best Regards,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Victor Leschuk | Software Engineer | Access Softek<o:p></o:p></pre>
</div>
</div>
</body>
</html>