<html>
<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Segmentation fault with -O2 -g"
href="http://llvm.org/bugs/show_bug.cgi?id=20612">20612</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Segmentation fault with -O2 -g
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: AArch64
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>liujiangning1@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12875" name="attach_12875" title="a test case to expose failure">attachment 12875</a> <a href="attachment.cgi?id=12875&action=edit" title="a test case to expose failure">[details]</a></span>
a test case to expose failure
Hi,
For the test case below,
{code}
void f (int *);
int test_dgi (void)
{
int arg1[4];
int prod[4 * 2];
int carry;
int i, j, k;
f (arg1);
for (i = 0; i < 4; i++)
{
carry = 0;
for (j = 0; j < 4; j++)
{
k = i + j;
carry += arg1[i] * arg1[j];
carry += prod[k];
prod[k] = (carry >> 1);
}
}
return 0;
}
{code}
we have compile-time segmentation failure with command line option
clang -O2 -target arm64-linux-gnueabi ff_i.c -g
But the case can build pass, if "-g" is removed.
Attached .ll file is generated by "clang -mtriple=arm64-linux-gnueabi -O2 -g -S
-emit-llvm". With command line option "llc -O2 -mtriple=arm64-linux-gnueabi
ff_i_g.ll", we have the following failure,
llc: /home/jialiu01/llvm/review/llvm/lib/CodeGen/MachineTraceMetrics.cpp:628:
<anonymous namespace>::DataDep::DataDep(const llvm::MachineRegisterInfo *,
unsigned int, unsigned int): Assertion `!DefI.atEnd() && "Register has no
defs"' failed.
0 libLLVMSupport.so 0x00007f95ac04f15e llvm::sys::PrintStackTrace(_IO_FILE*) +
46
1 libLLVMSupport.so 0x00007f95ac04f41b
2 libLLVMSupport.so 0x00007f95ac04f68e
3 libpthread.so.0 0x00007f95aad17bb0
4 libc.so.6 0x00007f95a9f3df77 gsignal + 55
5 libc.so.6 0x00007f95a9f415e8 abort + 328
6 libc.so.6 0x00007f95a9f36d43
7 libc.so.6 0x00007f95a9f36df2
8 libLLVMCodeGen.so 0x00007f95acfcfc12
9 libLLVMCodeGen.so 0x00007f95acfcaf05
10 libLLVMCodeGen.so 0x00007f95acfca78e
llvm::MachineTraceMetrics::Ensemble::computeInstrDepths(llvm::MachineBasicBlock
const*) + 1438
11 libLLVMCodeGen.so 0x00007f95acfcd1da
llvm::MachineTraceMetrics::Ensemble::getTrace(llvm::MachineBasicBlock const*) +
42
12 libLLVMCodeGen.so 0x00007f95acf1c6a3
13 libLLVMCodeGen.so 0x00007f95acf1c3bc
14 libLLVMCodeGen.so 0x00007f95acf43dee
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 110
15 libLLVMCore.so 0x00007f95acb0f06b
llvm::FPPassManager::runOnFunction(llvm::Function&) + 427
16 libLLVMCore.so 0x00007f95acb0f378
llvm::FPPassManager::runOnModule(llvm::Module&) + 104
17 libLLVMCore.so 0x00007f95acb0fa4a
18 libLLVMCore.so 0x00007f95acb0f62e
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 302
19 libLLVMCore.so 0x00007f95acb0fef1
llvm::legacy::PassManager::run(llvm::Module&) + 33
20 llc 0x000000000040ff57
21 llc 0x000000000040f0c2 main + 226
22 libc.so.6 0x00007f95a9f28de5 __libc_start_main + 245
23 llc 0x000000000040edc5
Stack dump:
0. Program arguments: /home/jialiu01/llvm/review/build/bin/llc -O2
-mtriple=arm64-linux-gnueabi ff_i_g.ll
1. Running pass 'Function Pass Manager' on module 'ff_i_g.ll'.
2. Running pass 'Machine InstCombiner' on function '@test_dgi'
Aborted (core dumped)</pre>
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