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<body><span class="vcard"><a class="email" href="mailto:rnk@google.com" title="Reid Kleckner <rnk@google.com>"> <span class="fn">Reid Kleckner</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - SelectionDAG instruction selection performs CSE on nodes with debug information"
href="https://llvm.org/bugs/show_bug.cgi?id=10003">bug 10003</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>rnk@google.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>WONTFIX
</td>
<td>---
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - SelectionDAG instruction selection performs CSE on nodes with debug information"
href="https://llvm.org/bugs/show_bug.cgi?id=10003#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - SelectionDAG instruction selection performs CSE on nodes with debug information"
href="https://llvm.org/bugs/show_bug.cgi?id=10003">bug 10003</a>
from <span class="vcard"><a class="email" href="mailto:rnk@google.com" title="Reid Kleckner <rnk@google.com>"> <span class="fn">Reid Kleckner</span></a>
</span></b>
<pre>Similar issue, consider the following code and the .loc directives in the
assembly:
volatile int x;
extern "C" void exit(int);
int main() {
x += 24;
x += 2;
x += 3;
x += 4;
exit(24);
}
addl $24, "?x@@3HC"(%rip)
.loc 1 5 5 # t.cpp:5:5
addl $2, "?x@@3HC"(%rip)
.loc 1 6 5 # t.cpp:6:5
addl $3, "?x@@3HC"(%rip)
.loc 1 7 5 # t.cpp:7:5
addl $4, "?x@@3HC"(%rip)
.loc 1 4 5 # t.cpp:4:5
movl $24, %ecx
.loc 1 8 3 # t.cpp:8:3
callq exit
.loc 1 9 1 # t.cpp:9:1
xorl %eax, %eax
addq $40, %rsp
retq
We shouldn't step backwards to line 4 between line 7 and 8. I'm pretty sure
this is DAG CSE, but I could be wrong.
I might take a look at this.</pre>
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