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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - aligned_alloc with out of range pow2 triggers assert in debug mode"
href="https://bugs.llvm.org/show_bug.cgi?id=45654">45654</a>
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<th>Summary</th>
<td>aligned_alloc with out of range pow2 triggers assert in debug mode
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>
</tr>
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<th>Component</th>
<td>opt
</td>
</tr>
<tr>
<th>Assignee</th>
<td>uday@polymagelabs.com
</td>
</tr>
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<th>Reporter</th>
<td>chang-sun.lin.jr@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>After D76971, this test case triggers an assert in a clang debug build:
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
int main() {
void *p, *q;
errno = 0;
p = (int *)aligned_alloc(0x8000000000000000,0x8000000000000000);
printf("%p %d\n", p, errno);
return 0;
}
clang -O3 maxalign.c
clang-11:
/export/iusers2/clin1/workspaces/llorg/llvm/llvm/lib/IR/Attributes.cpp:147:
static llvm::Attribute llvm::Attribute::getWithAlignment(llvm::LLVMContext&,
llvm::Align): Assertion `A <= llvm::Value::MaximumAlignment && "Alignment too
large."' failed.
It looks like the InstCombineCalls code in D76971 might need to check for
MaximumAlignment before generating the attribute.</pre>
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</p>
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