https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80764
Bug ID: 80764
Summary: ICE at -O3 in both 32-bit and 64-bit modes on
x86_64-linux-gnu (internal compiler error: in
verify_loop_structure, at cfgloop.c:1644)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Target Milestone: ---
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20170515 (experimental) [trunk revision 248042] (GCC)
$ gcc-trunk -O3 small.c
small.c: In function ‘fn1.part.0’:
small.c:12:1: error: size of loop 9 should be 6, not 7
}
^
small.c:12:1: error: loop 10’s latch does not have an edge to its header
small.c:12:1: internal compiler error: in verify_loop_structure, at
cfgloop.c:1644
0x7ba18a verify_loop_structure()
../../gcc-source-trunk/gcc/cfgloop.c:1644
0xb2ae3a execute_function_todo
../../gcc-source-trunk/gcc/passes.c:1984
0xb2b855 execute_todo
../../gcc-source-trunk/gcc/passes.c:2022
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ cat small.c
int b, d, f, h;
char e;
int fn1();
int main() { return fn1(); }
int fn1(int p1) {
for (; d;)
for (; e < 3;) {
for (; h;)
b = fn1(0);
return f;
}
}
$
