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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103231] [12 Regression] ICE
 (nondeterministic) on valid code at -O1 on x86_64-linux-gnu: Segmentation
 fault since r12-5014-g6b8b959675a3e14c
Date: Sun, 14 Nov 2021 15:37:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103231

--- Comment #9 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
A very simple repro (with ulimit -s 32):

[530] % compile.sh small.c
*** Compiling with: gcctk -O1 small.c
gcctk: internal compiler error: Segmentation fault signal terminated program
cc1
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.

*** Compiling with: gcc110 -O1 small.c
[531] %=20
[531] % cat small.c
int a, b;
int main() {
  int c, d;
L1:
  if (a) {
    __builtin_printf("%d", d);
  L2:
    goto L1;
  }
  if (b) {
    d =3D c;
    goto L2;
  }
  return 0;
}
[532] %=20
[532] % cat compile.sh
#!/bin/bash

ulimit -s 32

echo "*** Compiling with: gcctk -O1 $1"
gcctk -O1 $1

echo

echo "*** Compiling with: gcc110 -O1 $1"
gcc110 -O1 $1
[533] %=