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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [execute]binary compile with -O0 run diff to gcc -O0 on aarch64"
href="https://bugs.llvm.org/show_bug.cgi?id=51505">51505</a>
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<th>Summary</th>
<td>[execute]binary compile with -O0 run diff to gcc -O0 on aarch64
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>yansendao@huawei.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=25147" name="attach_25147" title="test-creduce.c">attachment 25147</a> <a href="attachment.cgi?id=25147&action=edit" title="test-creduce.c">[details]</a></span>
test-creduce.c
yansendao@jvmtest-129:boole-issue2603$ gcc test-creduce.c -Wall && ./a.out
3
yansendao@jvmtest-129:boole-issue2603$ ~/software/llvm12/bin/clang
test-creduce.c -Wall && ./a.out
test-creduce.c:7:10: warning: result of comparison of constant -1 with
expression of type 'unsigned int' is always true
[-Wtautological-constant-out-of-range-compare]
if (~a > -1L)
~~ ^ ~~~
1 warning generated.
0
yansendao@jvmtest-129:boole-issue2603$ ~/software/llvm12/bin/clang -v
clang version 12.0.1
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/yansendao/software/llvm12/bin
Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/8
Found candidate GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/7
Found candidate GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/8
Selected GCC installation: /usr/lib64/gcc/aarch64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
yansendao@jvmtest-129:boole-issue2603$ cat test-creduce.c
int printf(const char *, ...);
unsigned a;
long b;
short c, d;
long *e = &b;
short f() {
if (~a > -1L)
return 3;
return d;
}
int main() {
c = f();
*e = c;
printf("%d\n", (int)b);
return 0;
}</pre>
</div>
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