https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125040
Bug ID: 125040
Summary: [17 regression] internal compiler error: in clean, at
tree-ssa-pre.cc:2166, during GIMPLE pass: pre
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: lu.maltsis at postgrad dot manchester.ac.uk
Target Milestone: ---
Created attachment 64289
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64289&action=edit
preprocessed source
```sh
$ gcc /tmp/bug.c -O2
during GIMPLE pass: pre
/tmp/bug.c: In function ‘a’:
/tmp/bug.c:3:5: internal compiler error: in clean, at tree-ssa-pre.cc:2166
3 | int a() {
| ^
0x254161b internal_error(char const*, ...)
/home/lmaltsis/software/gcc/slot-b/src/gcc/diagnostic-global-context.cc:787
0x9c504f fancy_abort(char const*, int, char const*)
/home/lmaltsis/software/gcc/slot-b/src/gcc/diagnostics/context.cc:1813
0x8a6307 clean
/home/lmaltsis/software/gcc/slot-b/src/gcc/tree-ssa-pre.cc:2166
0x138859e compute_antic
/home/lmaltsis/software/gcc/slot-b/src/gcc/tree-ssa-pre.cc:2680
0x138859e execute
/home/lmaltsis/software/gcc/slot-b/src/gcc/tree-ssa-pre.cc:4643
/home/lmaltsis/software/gcc/slot-b/libexec/gcc/x86_64-pc-linux-gnu/17.0.0/cc1
-quiet -imultiarch x86_64-linux-gnu /tmp/bug.c -quiet -dumpdir a- -dumpbase
bug.c -dumpbase-ext .c -mtune=generic -march=x86-64 -O2 -o /tmp/ccT9t8pP.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ cat /tmp/bug.c
#include <stdio.h>
#include <stdlib.h>
int a() {
int b;
int *c = calloc(sizeof(int), b);
int count;
for (int d; d;)
for (int e;; b++) {
c[e] = c[b - count - 1];
c[b - count - 1] = count;
count = count + 1;
}
printf("", c);
}
```
Compiler Explorer Reproducer: https://godbolt.org/z/9ahxTf883
GCC Commit Hash: 1197598
(https://github.com/gcc-mirror/gcc/commit/1197598df31262aae4cf84e51fe876f7f0454917)
Compiles on 15.2: https://godbolt.org/z/6Me3o38Y6
Preprocessed source attached due to large size.
