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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 - X86 isel crashes when generating AVX code"
href="https://bugs.llvm.org/show_bug.cgi?id=51133">51133</a>
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<th>Summary</th>
<td>X86 isel crashes when generating AVX code
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jeremy.morse.llvm@gmail.com
</td>
</tr>
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<th>CC</th>
<td>andrea.dibiagio@gmail.com, craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk
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<pre>Using a recent main (bad3ebbaae3d) build of llc, the following code makes llc
crash in SelectionDAG with arguments `llc reduced.ll -o /dev/null
-mtriple=x86_64-- -mattr=avx`:
define hidden void @_Z1dv() local_unnamed_addr {
entry:
%call = tail call <32 x i8> undef(<32 x i8> undef, i32 32)
%rem = srem <32 x i8> %call, <i8 13, i8 5, i8 19, i8 34, i8 2, i8 8, i8 2, i8
88, i8 62, i8 62, i8 5, i8 7, i8 97, i8 2, i8 3, i8 60, i8 3, i8 87, i8 7, i8
6, i8 84, i8 -128, i8 127, i8 56, i8 114, i8 1, i8 50, i8 7, i8 2, i8 8, i8 97,
i8 117>
%k.0.k.0.k.0. = load volatile <8 x i32>, <8 x i32>* undef, align 32
%0 = bitcast <8 x i32> %k.0.k.0.k.0. to <32 x i8>
%cmp = icmp ne <32 x i8> %rem, zeroinitializer
%cmp4 = icmp ne <32 x i8> %0, zeroinitializer
%1 = and <32 x i1> %cmp4, %cmp
%sext = sext <32 x i1> %1 to <32 x i8>
%call5 = tail call i32 (i8*, ...) undef(i8* poison, <32 x i8> %sext)
ret void
}
The crash is an assertion failure:
SelectionDAG.cpp:9016: void llvm::SelectionDAG::ReplaceAllUsesWith(llvm::SDNode
*, llvm::SDNode *): Assertion `(!From->hasAnyUseOfValue(i) ||
From->getValueType(i) == To->getValueType(i)) && "Cannot use this version of
ReplaceAllUsesWith!"' failed
It doesn't replicate if you remove -mattr=avx. I have a C reproducer (involving
some intrinsics) of this if that's more useful.</pre>
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</p>
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