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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression since SVN r341136, "[ARM] Enable GEP offset splitting for 32-bit ARM.""
href="https://bugs.llvm.org/show_bug.cgi?id=40013">40013</a>
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<th>Summary</th>
<td>Regression since SVN r341136, "[ARM] Enable GEP offset splitting for 32-bit ARM."
</td>
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<th>Product</th>
<td>libraries
</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>All
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<th>Status</th>
<td>NEW
</td>
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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: ARM
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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>efriedma@codeaurora.org, llvm-bugs@lists.llvm.org, peter.smith@linaro.org, Ties.Stuij@arm.com
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21221" name="attach_21221" title="Compressed reproduction sample">attachment 21221</a> <a href="attachment.cgi?id=21221&action=edit" title="Compressed reproduction sample">[details]</a></span>
Compressed reproduction sample
Since SVN r341136, "[ARM] Enable GEP offset splitting for 32-bit ARM.",
compiling for ARM can trigger the error "Instruction does not dominate all
uses!".
To reproduce, compile the attached sample code with "clang++ -target
armv7-w64-mingw32 -c -O3 repro.cpp", which results in the following error:
Instruction does not dominate all uses!
%splitgep = getelementptr i8, i8* %47, i32 4
%46 = bitcast i8* %splitgep to i48*
fatal error: error in backend: Broken function found, compilation aborted!
clang-8: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
(The same issue can also be reproduced with an armv7-linux-gnueabihf target,
while the source code will produce a few C++ level warnings in that case.)</pre>
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