<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Illegal instruction (core dumped) when running the target program optimized with "opt -instcombine -licm -inline -jump-threading -argpromotion -early-cse -ipsccp -instcombine -memcpyopt -gvn -instcombine -globalopt""
href="https://bugs.llvm.org/show_bug.cgi?id=42081">42081</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Illegal instruction (core dumped) when running the target program optimized with "opt -instcombine -licm -inline -jump-threading -argpromotion -early-cse -ipsccp -instcombine -memcpyopt -gvn -instcombine -globalopt"
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cszide@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22057" name="attach_22057" title=".bc file of the source code">attachment 22057</a> <a href="attachment.cgi?id=22057&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$ cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
8 Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
$clang -v
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -mllvm -disable-llvm-optzns small.c
$clang small.bc -o small1.out && ./small1.out
$opt -instcombine -licm -inline -jump-threading -argpromotion -early-cse
-ipsccp -instcombine -memcpyopt -gvn -instcombine -globalopt small.bc -o
small-opt.bc
$ clang small-opt.bc -o small2.out && ./small2.out
Illegal instruction (core dumped)
without globalopt pass, the target program also has a Segmentation fault
problem.
$opt -instcombine -licm -inline -jump-threading -argpromotion -early-cse
-ipsccp -instcombine -memcpyopt -gvn -instcombine small.bc -o small-opt1.bc
$clang small-opt1.bc -o small3.out && ./small3.out
Segmentation fault (core dumped)
------------------------------------------------
int a, x, k, i, g, f, b;
int *c;
int **d = &c;
int ***e = &d;
int ****h = &e;
void l(int **r) {
int s[9][8][3] = {0};
int *z = &s[1][0][0];
int t = 0;
for (a=0;a<1;a++) {
int u[][7][6] = {0};
int *v[][3][10] = {0, &s[0][3][0], 0, &i,
&s[7][7][2], &s[0][3][0], &t, &u[3][6][1],
&u[3][6][1], &t};
for (g=0; g <= 1;g++) {
int **w = &z;
*w = ***h = *r;
}
}
}
int **m(int y, int *z, unsigned char a, unsigned char b) {
for (; x;)
;
for (f = 4; f;) {
int **aa = &c;
return aa;
}
return 0;
}
short int n() {
l(m(0, &b, 4, 4));
return 0;
}
void main() { n(); }</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>