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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Offset overflow on calling __chkstc and __alloca on x64"
href="http://llvm.org/bugs/show_bug.cgi?id=18582">18582</a>
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<th>Summary</th>
<td>Offset overflow on calling __chkstc and __alloca on x64
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mikhaill@microsoft.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>We are trying to use MCJIT, and ran into x64 codegen problem when required
stack frame is more than 4K.
In this case, the system attempts to call __chkstk to probe the stack.
This attempt results in assertion in RuntimeDyldELF::resolveX86_64Relocation(),
case ELF::R_X86_64_PC32, because the RealOffset does not fit in 32 bits.
Same happens with __alloca, created via IRBuilder::CreateAlloca in a
conditional block, rather than at the beginning of a JITed function.
Perhaps the issue can be fixed by using indirect call via 64-bit register or
replicating service routines inside jitted block.</pre>
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</p>
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