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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [PM] Code-size regressions"
href="https://bugs.llvm.org/show_bug.cgi?id=46858">46858</a>
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<th>Summary</th>
<td>[PM] Code-size regressions
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sjoerd.meijer@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Switching to the NPM shows code-size regressions compared to the LPM. For the
llvm test-suite targeting X86, these are the code-size numbers in bytes for the
15 worst regressions:
LPM NPM Diff App
-----------------------------------------------------------------------
399999 404935 4936
SingleSource/Benchmarks/Adobe-C++/simple_types_loop_invariant
413241 418065 4824
SingleSource/Benchmarks/Adobe-C++/simple_types_constant_folding
225786 229178 3392 SingleSource/UnitTests/matrix-types-spec
194107 196283 2176 SingleSource/Benchmarks/Adobe-C++/loop_unroll
110540 111836 1296 SingleSource/Benchmarks/Adobe-C++/stepanov_abstraction
51529 52569 1040 SingleSource/Benchmarks/Adobe-C++/stepanov_vector
17345 17841 496 SingleSource/Benchmarks/Adobe-C++/functionobjects
24768 25072 304 SingleSource/Benchmarks/Misc-C++/stepanov_container
5897 6177 280 SingleSource/Benchmarks/Misc/himenobmtxpa
38193 38465 272 SingleSource/Benchmarks/Misc-C++/stepanov_v1p2
5290 5530 240 SingleSource/Benchmarks/Misc/whetstone
1883 2099 216
SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-pr49886
333621 333789 168 SingleSource/Benchmarks/Linpack/linpack-pc
9423 9591 168 SingleSource/Benchmarks/Misc/oourafft
1698 1842 144
SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-pr38819
9819 9939 120
SingleSource/Benchmarks/Shootout-C++/Shootout-C++-wordfreq
5182 5302 120 SingleSource/Benchmarks/McGill/chomp
where NPM is the new pass manger, LPM the legacy pass manager, Diff = NPM -
LMP.
These numbers were obtained with Oz, using the standard cmake config file
"cmake/caches/Oz.cmake" from the test-suite.
Targeting ARM, we see similar regressions, the trend is the same, but haven't
yet tried this on the llvm test-suite.
TODO: I haven't done yet any root cause analysis on this.</pre>
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