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<head>
<base href="https://bugs.llvm.org/">
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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 - wrong code with "opt -structurizecfg -reg2mem -newgvn -inline -jump-threading""
href="https://bugs.llvm.org/show_bug.cgi?id=41702">41702</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code with "opt -structurizecfg -reg2mem -newgvn -inline -jump-threading"
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>8.0
</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=21870" name="attach_21870" title=".bc file of the source code">attachment 21870</a> <a href="attachment.cgi?id=21870&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 8.0.0 (tags/RELEASE_800/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/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/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
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 -o small.bc
$ clang small.bc -o small1.out && ./small1.out
1
0
0
0
$opt -structurizecfg -reg2mem -newgvn -inline -jump-threading small.bc -o
small-opt.bc
$clang small-opt.bc -o small2.out && ./small2.out
0
0
0
0
-------------------------------------------------
#include <stdio.h>
typedef signed char int8_t;
typedef short int int16_t;
typedef int int32_t;
typedef long int int64_t;
/* Unsigned. */
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
typedef unsigned long int uint64_t;
static uint32_t
(safe_sub_func_uint32_t_u_u)(uint32_t ui1, uint32_t ui2 )
{
return ui1 - ui2;
}
int16_t b, g, f, e = 1, d, c;
uint64_t h[1][4];
int8_t k(int16_t, int8_t);
const uint32_t l();
int8_t m() {
k(b, 0);
return 0;
}
int8_t k(int16_t n, int8_t o) {
uint64_t *ab = &h[0][0];
*ab = safe_sub_func_uint32_t_u_u(l(), 0);
return g;
}
const uint32_t l() {
for (; 0;)
ak:
for (; c;) {
int32_t a;
for (; 0;)
return d;
}
for (; f;)
goto ak;
return e;
}
void main() {
int i, j, am = 0;
m();
i = 0;
for (j = 0; j < 4; j++)
printf("%lu\n",h[i][j]);
}</pre>
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