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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong mapping assembly-line at Og"
href="https://bugs.llvm.org/show_bug.cgi?id=51507">51507</a>
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<tr>
<th>Summary</th>
<td>Wrong mapping assembly-line at Og
</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>DebugInfo
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>artuso@diag.uniroma1.it
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, keith.walker@arm.com, llvm-bugs@lists.llvm.org, paul_robinson@playstation.sony.com
</td>
</tr></table>
<p>
<div>
<pre>Comment:
Line 8 is wrongly assigned to a shift assembly instruction.
Steps to reproduce bug:
root@14f37d90482b:/home/stepping/output# clang -v
clang version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
957334382cd12ec07b46c0ddfdcc220731f6d80f)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
root@14f37d90482b:/home/stepping/output# lldb -v
lldb version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a> revision
957334382cd12ec07b46c0ddfdcc220731f6d80f)
clang revision 957334382cd12ec07b46c0ddfdcc220731f6d80f
llvm revision 957334382cd12ec07b46c0ddfdcc220731f6d80f
root@14f37d90482b:/home/stepping/output# cat a.c
int a, b;
int *g_3377 = &b;
int main() {
short c;
char l_3718[7][4];
c = 3 > 7 >> a ? 0 : 3 << a;
l_3718[6][3] = c;
(*g_3377) = l_3718[6][3];
}
root@14f37d90482b:/home/stepping/output# cat -n a.c
1 int a, b;
2 int *g_3377 = &b;
3 int main() {
4 short c;
5 char l_3718[7][4];
6 c = 3 > 7 >> a ? 0 : 3 << a;
7 l_3718[6][3] = c;
8 (*g_3377) = l_3718[6][3];
9 }
root@14f37d90482b:/home/stepping/output# clang -Og -g -Wno-everything -o opt
a.c
root@14f37d90482b:/home/stepping/output# lldb opt
(lldb) target create "opt"
Current executable set to '/home/stepping/output/opt' (x86_64).
(lldb) b 8
Breakpoint 1: where = opt`main + 18 at a.c:8:15, address = 0x0000000000400492
(lldb) r
Process 30 launched: '/home/stepping/output/opt' (x86_64)
Process 30 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.1
frame #0: 0x0000000000400492 opt`main at a.c:8:15
5 char l_3718[7][4];
6 c = 3 > 7 >> a ? 0 : 3 << a;
7 l_3718[6][3] = c;
-> 8 (*g_3377) = l_3718[6][3];
9 }
(lldb) di -l
-> 3 int main() {
-> 4 short c;
-> 5 char l_3718[7][4];
-> 6 c = 3 > 7 >> a ? 0 : 3 << a;
-> 7 l_3718[6][3] = c;
-> 8 (*g_3377) = l_3718[6][3];
opt`main:
-> 0x400492 <+18>: shll %cl, %edx
0x400494 <+20>: sarl $0x18, %edx
0x400497 <+23>: xorl %ecx, %ecx</pre>
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