https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103816
Bug ID: 103816
Summary: ICE: in vect_build_slp_tree_2, at tree-vect-slp.c:1748
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: k.even-mendoza at imperial dot ac.uk
Target Milestone: ---
This program crashed with GCC-12 with -O2 and -O3:
typedef enum { e } f;
struct {
f __attribute__((mode(__byte__))) a;
f __attribute__((mode(__byte__))) b;
f __attribute__((mode(__byte__))) c;
f __attribute__((mode(__byte__))) d
} g[];
void main() { g[0].b = (g[0].b & g[4].b) * g[2305843009213693952].c; }
This code works fine with GCC-11. I tried several versions of GCC-12: 20211023,
20211118, and 20211216 on Ubuntu-18.
The trace looks like this:
===
fuzzer-file-54092.c:7:1: warning: no semicolon at end of struct or union
7 | } g[];
| ^
fuzzer-file-54092.c:7:3: warning: array ‘g’ assumed to have one element
7 | } g[];
| ^
during GIMPLE pass: slp
fuzzer-file-54092.c: In function ‘main’:
fuzzer-file-54092.c:8:6: internal compiler error: in vect_build_slp_tree_2, at
tree-vect-slp.c:1748
8 | void main() { g[0].b = (g[0].b & g[4].b) * g[2305843009213693952].c; }
| ^~~~
0x7d2c1c vect_build_slp_tree_2
.././../gcc-source/gcc/tree-vect-slp.c:1748
0x119b89d vect_build_slp_tree
.././../gcc-source/gcc/tree-vect-slp.c:1549
0x119fe30 vect_build_slp_instance
.././../gcc-source/gcc/tree-vect-slp.c:3025
0x11a5966 vect_analyze_slp(vec_info*, unsigned int)
.././../gcc-source/gcc/tree-vect-slp.c:3388
0x11aa0ea vect_slp_analyze_bb_1
.././../gcc-source/gcc/tree-vect-slp.c:5762
0x11aa0ea vect_slp_region
.././../gcc-source/gcc/tree-vect-slp.c:5864
0x11aa0ea vect_slp_bbs
.././../gcc-source/gcc/tree-vect-slp.c:6056
0x11ac131 vect_slp_function(function*)
.././../gcc-source/gcc/tree-vect-slp.c:6144
0x11b36e2 execute
.././../gcc-source/gcc/tree-vectorizer.c:1503
Please submit a full bug report,
