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From: "kito at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103603] New: [11 Regression] stack overflow
 on ranger for huge program, but OK for legacy
Date: Tue, 07 Dec 2021 13:18:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103603

            Bug ID: 103603
           Summary: [11 Regression] stack overflow on ranger for huge
                    program, but OK for legacy
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kito at gcc dot gnu.org
                CC: aldyh at gcc dot gnu.org
  Target Milestone: ---

ranger taking too deep recursive checking on program with lots of expressio=
n,
but fixed on trunk via pr103254, however the patch-set is not easy to backp=
ort
to GCC 11 since gimple-range-path.cc isn't exist at GCC 11.

Testcase:
```
#define STMT \
    t +=3D 1; \
    t *=3D 2; \
    t -=3D 1; \
    t &=3D 0xfff00fff; \
    t ^=3D 0x14022; \
    t %=3D 0xffffff3; \
    t +=3D 6; \
    t *=3D 10; \

#define STMT2 STMT STMT
#define STMT4 STMT2 STMT2
#define STMT8 STMT4 STMT4
#define STMT16 STMT8 STMT8
#define STMT32 STMT16 STMT16
#define STMT64 STMT32 STMT32
#define STMT128 STMT64 STMT64
#define STMT256 STMT128 STMT128


int foo(int init) {
  int t =3D init,i,iter;
  for(iter=3D0; iter < 2; ++iter) {
      STMT256 STMT256 STMT256
  }
  return t;
}
```

How to reproduce:
$ gcc-11 xred.c -O2 # OK with --param=3Devrp-mode=3Dlegacy
gcc-11: internal compiler error: Segmentation fault signal terminated progr=
am
cc1
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-11/README.Bugs> for instructions.

Backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x000000000141550f in gimple_ranger::range_of_range_op(irange&, gimple*) ()
(gdb) bt
#0  0x000000000141550f in gimple_ranger::range_of_range_op(irange&, gimple*=
) ()
#1  0x0000000001417b9b in gimple_ranger::calc_stmt(irange&, gimple*,
tree_node*) ()
#2  0x0000000001418152 in gimple_ranger::range_of_stmt(irange&, gimple*,
tree_node*) ()
#3  0x0000000001413ce1 in gimple_ranger::range_of_expr(irange&, tree_node*,
gimple*) ()
#4  0x0000000001415604 in gimple_ranger::range_of_range_op(irange&, gimple*=
) ()
#5  0x0000000001417b9b in gimple_ranger::calc_stmt(irange&, gimple*,
tree_node*) ()
#6  0x0000000001418152 in gimple_ranger::range_of_stmt(irange&, gimple*,
tree_node*) ()
#7  0x0000000001413ce1 in gimple_ranger::range_of_expr(irange&, tree_node*,
gimple*) ()
#8  0x0000000001415604 in gimple_ranger::range_of_range_op(irange&, gimple*=
) ()
#9  0x0000000001417b9b in gimple_ranger::calc_stmt(irange&, gimple*,
tree_node*) ()

Note:
GCC 11 with--param=3Devrp-mode=3Dlegacy and GCC-12 (after
g:d1c1919ef8a18eea9d5c1741f8c9adaabf5571f2) are work without stack overflow
even more statement like that:
```
#define STMT \
    t +=3D 1; \
    t *=3D 2; \
    t -=3D 1; \
    t &=3D 0xfff00fff; \
    t ^=3D 0x14022; \
    t %=3D 0xffffff3; \
    t +=3D 6; \
    t *=3D 10; \

#define STMT2 STMT STMT
#define STMT4 STMT2 STMT2
#define STMT8 STMT4 STMT4
#define STMT16 STMT8 STMT8
#define STMT32 STMT16 STMT16
#define STMT64 STMT32 STMT32
#define STMT128 STMT64 STMT64
#define STMT256 STMT128 STMT128


int foo(int init) {
  int t =3D init,i,iter;
  for(iter=3D0; iter < 2; ++iter) {
      STMT256 STMT256 STMT256 STMT256 STMT256 STMT256 STMT256 STMT256 STMT2=
56
STMT256 STMT256
  }
  return t;
}
```=