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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - builtin_assume_aligned uses 32-bits for alignment"
href="https://bugs.llvm.org/show_bug.cgi?id=43638">43638</a>
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<th>Summary</th>
<td>builtin_assume_aligned uses 32-bits for alignment
</td>
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<th>Product</th>
<td>clang
</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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>joel.gouly@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>This test cases crashes clang, because 'unsigned' is used for the alignment,
rather than 'size_t'.
const void * square(const void* num) {
void* a = __builtin_assume_aligned((const void*)num, 4294967296);
return a;
}
Assertion:
llvm/llvm/include/llvm/IR/IRBuilder.h:2624: llvm::CallInst* llvm::IRBuilder<T,
Inserter>::CreateAlignmentAssumption(const llvm::DataLayout&, llvm::Value*,
unsigned int, llvm::Value*, llvm::Value**) [with T = llvm::ConstantFolder;
Inserter = clang::CodeGen::CGBuilderInserter]: Assertion `Alignment != 0 &&
"Invalid Alignment"' failed.
The affected functions are `EmitAlignmentAssumption` in
lib/CodeGen/CodeGenFunction.h and also `CreateAlignmentAssumption` in
include/llvm/IR/IRBuilder.h</pre>
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</p>
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