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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Using large large arrays causes assertion failure"
href="https://bugs.llvm.org/show_bug.cgi?id=43929">43929</a>
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<th>Summary</th>
<td>Using large large arrays causes assertion failure
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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>PC
</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>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: AArch64
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>kiranchandramohan@gmail.com
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<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, peter.smith@linaro.org, Ties.Stuij@arm.com
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<p>
<div>
<pre>The following C program, when compiled with clang, leads to an assertion
failure. This program has a large local array.
lib/Target/AArch64/AArch64FrameLowering.cpp:962: virtual void
llvm::AArch64FrameLowering::emitPrologue(llvm::MachineFunction&,
llvm::MachineBasicBlock&) const: Assertion `NumBytes >= 0 && "Negative stack
allocation size!?"' failed.
#define LARGE_INT (256*1024*1024)
void set_large()
{
long int large[LARGE_INT];
large[0] = 1;
}
Surprisingly if I increase LARGE_INT to (512*1024*1024) then the assertion is
not hit. This difference in behaviour does not seem correct.
I have also see the following assertion being hit when working with large
arrays.
Target/AArch64/AArch64RegisterInfo.cpp:393: virtual bool
llvm::AArch64RegisterInfo::isFrameOffsetLegal(const llvm::MachineInstr*,
unsigned int, int64_t) const: Assertion `Offset <= INT_MAX && "Offset too big
to fit in int."' failed.</pre>
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