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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 -simplifycfg -structurizecfg -inline" (generated code hangs)"
href="https://bugs.llvm.org/show_bug.cgi?id=41558">41558</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code with "opt -simplifycfg -structurizecfg -inline" (generated code hangs)
</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=21812" name="attach_21812" title=".bc file of the source code">attachment 21812</a> <a href="attachment.cgi?id=21812&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$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 -o small.bc
$clang small.bc -o small1.out && ./small1.out
checksum = 9add2096
$opt -simplifycfg -structurizecfg -inline small.bc -o small-opt1.bc
$clang small-opt.bc -o small2.out && timeout -s 9 10 ./small2.out
Killed
$opt -simplifycfg -structurizecfg small.bc -o small-opt2.bc
$ clang small-opt2.bc -o small3.out && ./small3.out
checksum = d8f827eb
-----------------------------------------------
//------------------------
typedef signed char int8_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 crc32_tab[256];
static uint32_t crc32_context = 0xFFFFFFFFUL;
static void
crc32_gentab (void)
{
uint32_t crc;
const uint32_t poly = 0xEDB88320UL;
int i, j;
for (i = 0; i < 256; i++) {
crc = i;
for (j = 8; j > 0; j--) {
if (crc & 1) {
crc = (crc >> 1) ^ poly;
} else {
crc >>= 1;
}
}
crc32_tab[i] = crc;
}
}
static void
crc32_byte (uint8_t b) {
crc32_context =
((crc32_context >> 8) & 0x00FFFFFF) ^
crc32_tab[(crc32_context ^ b) & 0xFF];
}
static void
crc32_8bytes (uint64_t val)
{
crc32_byte ((val>>0) & 0xff);
crc32_byte ((val>>8) & 0xff);
crc32_byte ((val>>16) & 0xff);
crc32_byte ((val>>24) & 0xff);
crc32_byte ((val>>32) & 0xff);
crc32_byte ((val>>40) & 0xff);
crc32_byte ((val>>48) & 0xff);
crc32_byte ((val>>56) & 0xff);
}
static void
transparent_crc (uint64_t val, char* vname, int flag)
{
crc32_8bytes(val);
if (flag) {
printf("...checksum after hashing %s : %lX\n", vname,
crc32_context ^ 0xFFFFFFFFUL);
}
}
static inline void
platform_main_end (uint64_t x, int flag)
{
if (!flag) {
printf ("checksum = %llx\n", x);
}
}
//------------------------
int a, b, c, d = 2;
uint16_t e(uint8_t);
int32_t *f(int32_t *, int32_t *, int32_t, uint8_t);
int32_t g(){}
int64_t h() {
uint8_t k = e(0);
return k;
}
uint16_t e(uint8_t j) {
uint32_t *m = &a;
uint8_t l = 0;
f(g, m, j, j);
return l;
}
int32_t *f(int32_t *o, int32_t *n, int32_t q, uint8_t p) {
for (;;) {
int i;
for (; c <= 2;) {
int32_t *s[9][3][9] = {&b};
for (i = 0; i; i++)
;
for (; i;)
i = 0;
for (d = 0; d <= 2;)
return s[7][2][7];
}
for (; p; p++)
;
}
}
void main() {
int r = 0;
crc32_gentab();
h();
transparent_crc(d, "", r);
platform_main_end(crc32_context, 0);</pre>
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