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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Constant vectors do not support ConstantExprs"
href="https://llvm.org/bugs/show_bug.cgi?id=26026">26026</a>
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<th>Summary</th>
<td>Constant vectors do not support ConstantExprs
</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>Macintosh
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Interpreter
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>btaylor@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15558" name="attach_15558" title="Patch to enable ConsantExpr evaluation for constant vectors">attachment 15558</a> <a href="attachment.cgi?id=15558&action=edit" title="Patch to enable ConsantExpr evaluation for constant vectors">[details]</a></span>
Patch to enable ConsantExpr evaluation for constant vectors
I am working on a project that uses integer vectors fairly extensively. Some
values in the vectors came from constant pointers cast to 64-bit integers, and
the LLVM optimizer would often end up folding values into instructions that
looked like this:
store <2 x i64> <i64 ptrtoint (... constant_pointer_value ... to i64), i64 0>,
<2 x i64>* %f
ExecutionEngine aborts at runtime on all instructions like this because
ExecutionEngine::getConstantValue assumes all vector constants are "simple
constants" whose values are ConstantInts, not handling the case of
ConstantExpr.
I attached a patch, which you can also see in my git branch here -
<a href="https://github.com/finiteloop/llvm/commit/a7ad5bdbbab509d2a7d8c5af35e436e2b72730c4">https://github.com/finiteloop/llvm/commit/a7ad5bdbbab509d2a7d8c5af35e436e2b72730c4</a></pre>
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