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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [x86] Assertion failed: ((EltVT.getSizeInBits() >= 64 || (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) && "getConstant with a uint64_t value that doesn't fit in the type!"), function getConstant, file SelectionDAG.cpp, line 1188."
href="https://bugs.llvm.org/show_bug.cgi?id=51066">51066</a>
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<th>Summary</th>
<td>[x86] Assertion failed: ((EltVT.getSizeInBits() >= 64 || (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) && "getConstant with a uint64_t value that doesn't fit in the type!"), function getConstant, file SelectionDAG.cpp, line 1188.
</td>
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<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dimitry@andric.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>As reported in <a href="https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257132">https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257132</a>, clang
asserts when cross-building for an i386 target on amd64:
Assertion failed: ((EltVT.getSizeInBits() >= 64 || (uint64_t)((int64_t)Val >>
EltVT.getSizeInBits()) + 1 < 2) && "getConstant with a uint64_t value that
doesn't fit in the type!"), function getConstant, file
/usr/local/release-builds/i386/usr/src/contrib/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp,
line 1337.
Minimize test case:
// clang -cc1 -triple i386-- -S -O1 kern_mbuf-min.c
int a;
struct b {
int c;
char d[-sizeof(0)];
int e;
} f();
void g() {
struct b *h = (struct b *)a;
if (h->e)
f();
}
Note that setting the target to x86_64 makes the assertion go away, and shows
an (expected) error message instead:
kern_mbuf-min.c:5:10: error: array is too large (18446744073709551612 elements)
char d[-sizeof(0)];
^~~~~~~~~~
kern_mbuf-min.c:9:17: warning: cast to 'struct b *' from smaller integer type
'int' [-Wint-to-pointer-cast]
struct b *h = (struct b *)a;
^~~~~~~~~~~~~
1 warning and 1 error generated.
I have tested this with various versions of clang, and even the oldest I had
lying around (clang 3.1, trunk r150000!) gave the same assertion...</pre>
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