https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117113
Bug ID: 117113
Summary: ICE on valid code at -O3 with "-fno-tree-dce
-fno-inline" on x86_64-linux-gnu: verify_ssa failed
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
It appears long latent as it reproduces with 8.* and later (with -fchecking).
Compiler Explorer: https://godbolt.org/z/aMxdW58Gs
[508] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20241013 (experimental) (GCC)
[509] %
[509] % gcctk -O3 -fno-tree-dce -fno-inline small.c
small.c: In function ‘main’:
small.c:5:5: error: stmt with wrong VUSE
5 | int main() {
| ^~~~
# VUSE <.MEM_21>
_95 ={v} d[0];
expected .MEM_85
small.c:5:5: error: stmt with wrong VUSE
# VUSE <.MEM_21>
vol.0_96 ={v} d[0];
expected .MEM_85
small.c:5:5: error: PHI node with wrong VUSE on edge from BB 56
.MEM_99 = PHI <.MEM_21(53), .MEM_21(56)>
expected .MEM_85
small.c:5:5: error: stmt with wrong VUSE
# VUSE <.MEM_21>
_65 ={v} d[0];
expected .MEM_99
small.c:5:5: error: stmt with wrong VUSE
# VUSE <.MEM_21>
vol.0_66 ={v} d[0];
expected .MEM_99
small.c:5:5: error: PHI node with wrong VUSE on edge from BB 41
.MEM_69 = PHI <.MEM_21(57), .MEM_21(41)>
expected .MEM_99
small.c:5:5: error: PHI node with wrong VUSE on edge from BB 57
.MEM_69 = PHI <.MEM_21(57), .MEM_21(41)>
expected .MEM_99
small.c:5:5: error: PHI node with wrong VUSE on edge from BB 53
.MEM_99 = PHI <.MEM_21(53), .MEM_21(56)>
expected .MEM_85
during GIMPLE pass: cunroll
small.c:5:5: internal compiler error: verify_ssa failed
0x26282d5 internal_error(char const*, ...)
../../gcc-trunk/gcc/diagnostic-global-context.cc:517
0x145d21e verify_ssa(bool, bool)
../../gcc-trunk/gcc/tree-ssa.cc:1203
0x136a15b verify_loop_closed_ssa(bool, loop*)
../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:693
0x136a15b verify_loop_closed_ssa(bool, loop*)
../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:681
0x1350b31 tree_unroll_loops_completely
../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.cc:1576
0x1350bb3 execute
../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.cc:1680
0x1350bb3 execute
../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.cc:1670
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.
[510] %
[510] % cat small.c
int a, b, c;
volatile int d[1];
void e() {}
void f(int g) {}
int main() {
int i;
for (; b; b--) {
for (i = 0; i < 3; i++) {
e();
f(d[0]);
d[0];
}
if (a)
c++;
}
return 0;
}
