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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - le32-unknown-nacl target does not optimize simple struct return values as primitive returns"
href="http://llvm.org/bugs/show_bug.cgi?id=18863">18863</a>
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<th>Summary</th>
<td>le32-unknown-nacl target does not optimize simple struct return values as primitive returns
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>caustin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12072" name="attach_12072" title="sret.cpp">attachment 12072</a> <a href="attachment.cgi?id=12072&action=edit" title="sret.cpp">[details]</a></span>
sret.cpp
The attached sret.cpp demonstrates a simple struct with a nondefault
constructor.
When compiled to IR for the default x86_64 target on Ubuntu 12.04 AMD64, it
optimizes the S struct into a simple i32. See the attached sret-amd64.ll.
When compiled to IR for the le32-unknown-nacl target, the struct is not
optimized away. See the attached sret-le32.ll.
Both files were generated with:
clang --std=c++11 -O2 -emit-llvm -target le32-unknown-nacl -c -Wall -o sret.bc
sret.cpp && llvm-dis -o sret-le32.ll sret.bc
clang --std=c++11 -O2 -emit-llvm -c -Wall -o sret.bc sret.cpp && llvm-dis -o
sret-amd64.ll sret.bc
This reproduces with both clang 3.3 and clang 3.4.
The lack of this optimization penalizes use of utility types, such as
InternedString and IntrusiveSmartPtr, used frequently in our
Emscripten-compiled project.</pre>
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