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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression since "[X86] Add MOVSDrr->MOVLPDrm entry to load folding table. Add custom handling to turn UNPCKLPDrr->MOVHPDrm when load is under aligned.""
href="https://bugs.llvm.org/show_bug.cgi?id=42616">42616</a>
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<th>Summary</th>
<td>Regression since "[X86] Add MOVSDrr->MOVLPDrm entry to load folding table. Add custom handling to turn UNPCKLPDrr->MOVHPDrm when load is under aligned."
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>martin@martin.st
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<th>CC</th>
<td>craig.topper@gmail.com, hans@chromium.org, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<pre>Created <span class=""><a href="attachment.cgi?id=22243" name="attach_22243" title="Reproduction source code">attachment 22243</a> <a href="attachment.cgi?id=22243&action=edit" title="Reproduction source code">[details]</a></span>
Reproduction source code
Since SVN r365287, "[X86] Add MOVSDrr->MOVLPDrm entry to load folding table.
Add custom handling to turn UNPCKLPDrr->MOVHPDrm when load is under aligned.",
some code seems to be miscompiled, failing tests.
I haven't yet been able to pinpoint what the issue is, but if building the
libav project (<a href="https://git.libav.org/?p=libav.git">https://git.libav.org/?p=libav.git</a>) for i686-w64-mingw32 with
clang, the mp3 float decoder tests start failing:
<a href="https://fate.libav.org/i686-mingw32-clang-trunk">https://fate.libav.org/i686-mingw32-clang-trunk</a>
The failure is isolated to one single source file (attached in preprocessed
form); if compiled as "clang -target i686-w64-mingw32 -c -O3
mpegaudiodec_float-preproc.c -o libavcodec/mpegaudiodec_float.o", it fails
tests if built with a compiler past this commit, and succeeds all tests if
built with the older compiler version.</pre>
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