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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failure (Windows on Arm): assert((!RPI.isPaired() || !NeedsFrameRecord || RPI.Reg2 != AArch64::FP || RPI.Reg1 == AArch64::LR) && "FrameRecord mst be allocated together with LR")"
href="https://bugs.llvm.org/show_bug.cgi?id=44271">44271</a>
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<th>Summary</th>
<td>Assertion failure (Windows on Arm): assert((!RPI.isPaired() || !NeedsFrameRecord || RPI.Reg2 != AArch64::FP || RPI.Reg1 == AArch64::LR) && "FrameRecord mst be allocated together with LR")
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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>Linux
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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>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>Richard.Townsend@arm.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Created <span class=""><a href="attachment.cgi?id=22932" name="attach_22932" title="Reproducer">attachment 22932</a> <a href="attachment.cgi?id=22932&action=edit" title="Reproducer">[details]</a></span>
Reproducer
When running the attached reproducer with this command line:
"clang-cl" "-cc1" "-triple" "arm64-unknown-windows-msvc19.16.0" "-emit-obj"
"-mframe-pointer=all" "-D_MT" "-flto-visibility-public-std"
"--dependent-lib=libcmt" "--dependent-lib=oldnames" "--show-includes"
"-fno-rtti-data" "-stack-protector" "2" "-nostdsysteminc" "-D"
"UCHAR_TYPE=wchar_t" "-D" "__DATE__=" "-D" "__TIME__=" "-D" "__TIMESTAMP__="
"-Os" "-Wno-builtin-macro-redefined" "-fms-extensions" "-std=c++14" "-x" "c++"
"reduce.cpp"
We get an assertion failure in computeCalleeSaveRegisterPairs
(AArch64FrameLowering.cpp). This reproducer is based on a region of the
Chromium code base (lzma_util.cc). The issue appears to come from the fact that
the compiler's trying pair X19 with X29/FP, which doesn't meet the assertion's
conditions.</pre>
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