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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dead Store Elimination breaks pointer return value"
href="http://llvm.org/bugs/show_bug.cgi?id=20645">20645</a>
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<th>Summary</th>
<td>Dead Store Elimination breaks pointer return value
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-bugs130814@oli-obk.de
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</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12890" name="attach_12890" title="a non minimal test case">attachment 12890</a> <a href="attachment.cgi?id=12890&action=edit" title="a non minimal test case">[details]</a></span>
a non minimal test case
a few optimizations will yield the following code in the ifcont block
ifcont: ; preds = %entry, %else
%storemerge = phi double [ %5, %else ], [ 1.000000e+00, %entry ]
store double %storemerge, double* %myfun.1
ret double* %myfun.1
which is marked as dead by the DSE
DSE: Dead Store at End of Block:
DEAD: store double %storemerge, double* %myfun.1
Objects: %myfun.1 = alloca double
running "opt bug.ll -o bug.optimized.ll -S -O3 -debug -print-after-all" will
basically erase the whole program. Compiling "bug.ll" without optimizations and
running it will return the 6th fibonacci number 8 as expected.</pre>
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