<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Bogus .loc directive with -mavx"
href="https://llvm.org/bugs/show_bug.cgi?id=30682">30682</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Bogus .loc directive with -mavx
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paul_robinson@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17431" name="attach_17431" title="test case">attachment 17431</a> <a href="attachment.cgi?id=17431&action=edit" title="test case">[details]</a></span>
test case
Compiling the attached test case for X64 Linux as
clang -c -g -S bz159663-min.cpp -mno-avx -o okay.s
and
clang -c -g -S bz159663-min.cpp -mavx -o bad.s
and diffing the results, we see the obvious instruction differences
but also 'bad.s' has some weird stuff going on with the .loc directives.
Here's an extract from a diff, showing the assembler text generated
for source line 11 (the call to method setY):
***************
.loc 1 11 33 is_stmt 1 # bz159663-min.cpp:11:33
movl -12(%rbp), %ecx
.loc 1 11 45 is_stmt 0 # bz159663-min.cpp:11:45
movb %ch, %dl # NOREX
movzbl %dl, %ecx # NOREX
.loc 1 11 32 # bz159663-min.cpp:11:32
! cvtsi2ssl %ecx, %xmm0
! .loc 1 11 8 # bz159663-min.cpp:11:8
movq -24(%rbp), %rdi # 8-byte Reload
callq _ZN7Vector44setYEf
---------------
.loc 1 11 33 is_stmt 1 # bz159663-min.cpp:11:33
movl -12(%rbp), %ecx
.loc 1 11 45 is_stmt 0 # bz159663-min.cpp:11:45
movb %ch, %dl # NOREX
movzbl %dl, %ecx # NOREX
+ .loc 1 10 32 is_stmt 1 # bz159663-min.cpp:10:32
+ # implicit-def: %XMM0
.loc 1 11 32 # bz159663-min.cpp:11:32
! vcvtsi2ssl %ecx, %xmm0, %xmm0
! .loc 1 11 8 is_stmt 0 # bz159663-min.cpp:11:8
movq -24(%rbp), %rdi # 8-byte Reload
callq _ZN7Vector44setYEf
***************
What is it about AVX that introduces the spurious directive?</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>