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<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 -ipsccp -deadargelim -jump-threading -reg2mem -structurizecfg -jump-threading -newgvn -instcombine -mem2reg -ipsccp""
href="https://bugs.llvm.org/show_bug.cgi?id=41700">41700</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code with "opt -ipsccp -deadargelim -jump-threading -reg2mem -structurizecfg -jump-threading -newgvn -instcombine -mem2reg -ipsccp"
</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=21868" name="attach_21868" title=".bc file of the source code">attachment 21868</a> <a href="attachment.cgi?id=21868&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
4
$opt -ipsccp -deadargelim -jump-threading -reg2mem -structurizecfg
-jump-threading -newgvn -instcombine -mem2reg -ipsccp small.bc -o small-opt.bc
$clang small-opt.bc -o small2.out && ./small2.out
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 int64_t(safe_add_func_int64_t_s_s)(int64_t si1, int64_t si2) {
return (((si1 > 0) && (si2 > 0) && (si1 > ((9223372036854775807L) - si2))) ||
((si1 < 0) && (si2 < 0) &&
(si1 < ((-9223372036854775807L - 1) - si2))))
? ((si1))
: (si1 + si2);
}
static int16_t(safe_sub_func_int16_t_s_s)(int16_t si1, int16_t si2) {
return (si1 - si2);
}
struct {
int64_t a;
} b, d;
int32_t c, e;
int32_t *f = &e;
int64_t *g = &b.a;
static int16_t h(uint16_t, int8_t, int8_t, int32_t, uint32_t);
int8_t i() {
int32_t k[] = {4};
uint32_t j = 3;
int32_t m = *g = safe_sub_func_int16_t_s_s(k[0], h(0, 0, j, *f, 0));
return m;
}
int16_t h(uint16_t l, int8_t o, int8_t n, int32_t q, uint32_t p) {
for (; c <= 7; c = safe_add_func_int64_t_s_s(c, 7))
for (; o; o = 3)
for (; d.a;)
return 0;
return q;
}
void main() {
i();
printf("%ld\n", b.a);
}</pre>
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