https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101083
Bug ID: 101083
Summary: [12 Regression] ICE with -Ofast in
TYPE_VECTOR_SUBPARTS, at tree.h:3929
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Needs -Ofast, test case derived from pr97832-2.c (-3.c),
changed recently between 20210606 and 20210613 :
$ cat z1.c
void foo1x1(double* restrict y, const double* restrict x, int clen)
{
int xi = clen & 2;
double f_re = x[0+xi+0];
double f_im = x[4+xi+0];
int clen2 = (clen+xi) * 2;
for (int c = 0; c < clen2; c += 8) {
// y[c] = y[c] - x[c]*conj(f);
for (int k = 0; k < 4; ++k) {
double x_re = x[k];
double x_im = x[c+4+k];
double y_re = y[c+0+k];
double y_im = y[c+4+k];
y_re = y_re - x_re * f_re - x_im * f_im;;
y_im = y_im + x_re * f_im - x_im * f_re;
y[c+0+k] = y_re;
y[c+4+k] = y_im;
}
}
}
$ gcc-12-20210613 -c z1.c -O3
$
$ gcc-12-20210613 -c z1.c -Ofast
during GIMPLE pass: vect
z1.c: In function 'foo1x1':
z1.c:1:6: internal compiler error: Segmentation fault
1 | void foo1x1(double* restrict y, const double* restrict x, int clen)
| ^~~~~~
0xbd1bef crash_signal
../../gcc/toplev.c:327
0xe321c4 TYPE_VECTOR_SUBPARTS(tree_node const*)
../../gcc/tree.h:3929
0xe321c4 vect_get_num_vectors
../../gcc/tree-vectorizer.h:1658
0xe321c4 vect_slp_analyze_node_operations_1
../../gcc/tree-vect-slp.c:4254
0xe321c4 vect_slp_analyze_node_operations
../../gcc/tree-vect-slp.c:4432
0xe32134 vect_slp_analyze_node_operations
../../gcc/tree-vect-slp.c:4412
0xe32134 vect_slp_analyze_node_operations
../../gcc/tree-vect-slp.c:4412
0xe32134 vect_slp_analyze_node_operations
../../gcc/tree-vect-slp.c:4412
0xe34cc9 vect_slp_analyze_operations(vec_info*)
../../gcc/tree-vect-slp.c:4619
0xe0f73c vect_analyze_loop_2
../../gcc/tree-vect-loop.c:2396
0xe117c4 vect_analyze_loop(loop*, vec_info_shared*)
../../gcc/tree-vect-loop.c:2986
0xe4064c try_vectorize_loop_1
../../gcc/tree-vectorizer.c:1004
0xe40e41 vectorize_loops()
../../gcc/tree-vectorizer.c:1238
