https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87087
Bug ID: 87087
Summary: Optimization hangs up and consumes over 15Gb of memory
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: konstantin.vladimirov at gmail dot com
Target Milestone: ---
Reproduction (after creduce, sorry for that code):
b;
d;
e() {
unsigned f;
unsigned g;
int h;
long i = 901380;
for (;;) {
d = 0;
for (; d; d++) {
h = 50126706678236;
f = 0;
for (; f < 15; f += 3) {
g = 0;
for (; g < 9; g++)
b = h = i - (h << 5) + h;
}
}
i = 0;
}
}
Compiler:
> gcc -v
Reading specs from
/apps/gcc/8.1.0/.bin/../lib64/gcc/x86_64-suse-linux/8.1.0/specs
COLLECT_GCC=/apps/gcc/8.1.0/.bin/gcc
COLLECT_LTO_WRAPPER=/apps/gcc/8.1.0/.bin/../libexec/gcc/x86_64-suse-linux/8.1.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ./configure --prefix=/apps/gcc/8.1.0
--libdir=/apps/gcc/8.1.0/lib64 --libexecdir=/apps/gcc/8.1.0/libexec
--bindir=/apps/gcc/8.1.0/bin --with-isl=/apps/gcc/8.1.0
--with-libelf=/apps/gcc/8.1.0 --with-mpfr=/apps/gcc/8.1.0
--with-gmp=/apps/gcc/8.1.0 --with-mpc=/apps/gcc/8.1.0
--disable-gnu-unique-object --enable-gold=yes --enable-lto
--enable-languages=c,c++,objc,fortran --build=x86_64-suse-linux
--host=x86_64-suse-linux --target=x86_64-suse-linux --enable-libotm
--disable-multilib --disable-bootstrap --disable-libstdcxx-pch
Thread model: posix
gcc version 8.1.0 (GCC)
Try to compile like this:
> gcc -O3 test.c
You will see compiler hanging up and eating all of memory.
> gcc -O2 test.c
This passes ok.
