https://bugs.llvm.org/show_bug.cgi?id=51507
Bug ID: 51507
Summary: Wrong mapping assembly-line at Og
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected],
[email protected]
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 (https://github.com/llvm/llvm-project.git
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 (https://github.com/llvm/llvm-project.git 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
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