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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98117] [8/9/10/11 Regression] wrong code with
 "-O3 -fno-tree-scev-cprop" since r8-1163-g7078979b291419f3
Date: Mon, 07 Dec 2020 08:39:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98117

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Simplified testcase, fails with -O3 -fno-tree-scev-cprop

unsigned char c;
void __attribute__((noipa))
e()
{
  do
    {
    }
  while (++c);
}
int main()
{
  e();
  if (c !=3D 0)
    __builtin_abort ();
  return 0;
}


It's the first new set_range_info that causes the miscompile.=