https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106860
Bug ID: 106860
Summary: [12/13 Regression] ICE in single_pred_edge, at
basic-block.h:347
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Started with r12 between 20211219 and 20220109, at -O3 or -Ofast,
and with file gcc.dg/graphite/isl-ast-gen-user-1.c :
(gcc/g++ configured with --enable-checking=yes)
$ cat isl-ast-gen-user-1.c
static const int N = 12;
int nSlip;
int main ()
{
int i, j, k, fdot = 0;
int a[N][N];
for ( i = 1; i < nSlip; i++)
{
for ( j = i+1; j < nSlip; j++)
{
for ( k = 0; k < i; k++)
fdot += a[i][k] * a[k][j];
a[i][j] = a[i][j] - fdot;
}
}
return 0;
}
$ g++-13-20220904 -c isl-ast-gen-user-1.c -Ofast -ftrapv -fnon-call-exceptions
-fno-tree-fre
during GIMPLE pass: lsplit
isl-ast-gen-user-1.c: In function 'int main()':
isl-ast-gen-user-1.c:4:5: internal compiler error: in single_pred_edge, at
basic-block.h:347
4 | int main ()
| ^~~~
0x1390add single_pred_edge
../../gcc/basic-block.h:347
0x1390add split_loop
../../gcc/tree-ssa-loop-split.cc:647
0x1390add tree_ssa_split_loops
../../gcc/tree-ssa-loop-split.cc:1678
