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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - GlobalISel unimplemented reg-to-reg copy assertion"
href="https://bugs.llvm.org/show_bug.cgi?id=40798">40798</a>
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<th>Summary</th>
<td>GlobalISel unimplemented reg-to-reg copy assertion
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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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: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sam.parker@arm.com
</td>
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, peter.smith@linaro.org, Ties.Stuij@arm.com
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<pre>Created <span class=""><a href="attachment.cgi?id=21500" name="attach_21500" title="reproducer at -O0">attachment 21500</a> <a href="attachment.cgi?id=21500&action=edit" title="reproducer at -O0">[details]</a></span>
reproducer at -O0
Running llc at -O0 with the attached .ll file results in an assertion in
llvm::AArch64InstrInfo::copyPhysReg. I don't know anything about GlobalISel but
from the debug output, I think the offending instructions are these:
%20:_(<4 x s32>) = G_EXTRACT %19:_(s384), 0
%21:_(<4 x s32>) = G_EXTRACT %19:_(s384), 128
%22:_(<4 x s32>) = G_EXTRACT %19:_(s384), 256
Which get legalised into:
%20:fpr(<4 x s32>) = G_BUILD_VECTOR %189:gpr(s64), %191:gpr(s64)
%21:fpr(<4 x s32>) = G_BUILD_VECTOR %179:gpr(s64), %181:gpr(s64)
%22:fpr(<4 x s32>) = G_BUILD_VECTOR %169:gpr(s64), %171:gpr(s64)
Which I believe is incorrect because of the type mismatch between the scalars
and the elements of the resulting vector.</pre>
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