| Issue |
164140
|
| Summary |
clang crashes at -O1 and above on x86_64-linux-gnu: error in backend: Broken function found, compilation aborted!
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
zhendongsu
|
Compiler Explorer: https://godbolt.org/z/4ra5rrrYb
Note:
- fails: trunk
- works: 21.1.0 and earlier
```
[505] % clangtk -v
clang version 22.0.0git (https://github.com/llvm/llvm-project.git 04e8edcc6ce4fb0693fa9ece24da5f920ccf064b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/home/suz/suz-local/software/local/clang-trunk/bin
Build config: +assertions
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda, version 12.1
[506] %
[506] % clangtk -O1 small.c
Instruction does not dominate all uses!
%and.not27 = select i1 %tobool16.not, i32 %land.ext14, i32 %4
%6 = trunc i32 %and.not27 to i16
in function main
fatal error: error in backend: Broken function found, compilation aborted!
clangtk: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 22.0.0git (https://github.com/llvm/llvm-project.git 04e8edcc6ce4fb0693fa9ece24da5f920ccf064b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/home/suz/suz-local/software/local/clang-trunk/bin
Build config: +assertions
clangtk: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clangtk: note: diagnostic msg: /tmp/small-f1d1e5.c
clangtk: note: diagnostic msg: /tmp/small-f1d1e5.sh
clangtk: note: diagnostic msg:
********************
[507] %
[507] % cat small.c
int a, b, d, e, f, h;
short c;
int main() {
if (e) {
int i = a;
j:
if (a < 2)
while (1)
;
if (a < 3) {
int l = 0;
l = f && ~i | l;
c = (h && 1) & (~(a * d) & ~(b && 1)) >> (i && 1);
b = d;
}
}
if (a)
goto j;
return 0;
}
```
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