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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-cl doesn't correctly map /arch:XXX options to corresponding features"
href="https://bugs.llvm.org/show_bug.cgi?id=51480">51480</a>
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<th>Summary</th>
<td>clang-cl doesn't correctly map /arch:XXX options to corresponding features
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>peterghost86@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>While compiling for XNNPACK with Clang, the following error will be raised.
2021-08-15T04:34:10.8521621Z
C:\actions-runner\_work\XNNPACK\src\f32-dwconv2d-chw\gen\3x3p1-minmax-ssse3-2x4.c(100,48):
error: '__builtin_ia32_palignr128' needs target feature ssse3
2021-08-15T04:34:10.8523468Z const __m128 vi0x3456 =
_mm_castsi128_ps(_mm_alignr_epi8(_mm_castps_si128(vi0x4567),
_mm_castps_si128(vi0x0123), 12));
2021-08-15T04:34:10.8524281Z ^
2021-08-15T04:34:10.8525139Z
C:\PROGRA~1\LLVM\lib\clang\14.0.0\include\tmmintrin.h(148,13): note: expanded
from macro '_mm_alignr_epi8'
2021-08-15T04:34:10.8526120Z
((__m128i)__builtin_ia32_palignr128((__v16qi)(__m128i)(a), \
However, the code compiles and links with MSVC cl.exe. To workaround it, I have
to pass `-clang:-mssse3` which shouldn't be needed.
Additional info
CMake script that sets the arch flags for different compilers:
<a href="https://github.com/google/XNNPACK/blob/79cd5f9e18ad0925ac9a050b00ea5a36230072db/CMakeLists.txt#L3504-L3531">https://github.com/google/XNNPACK/blob/79cd5f9e18ad0925ac9a050b00ea5a36230072db/CMakeLists.txt#L3504-L3531</a></pre>
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