[Bug tree-optimization/126569] New: [17 Regression] Checking ICE in phiopt

[ktkachov at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126569

            Bug ID: 126569
           Summary: [17 Regression] Checking ICE in phiopt
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: ice-checking
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
  Target Milestone: ---

int wx, qi, gw, ak;

void
f (void)
{
  while (wx)
    {
      int k2 = ak;
    ja:
      *(int **) &k2 = &gw;
      while (qi)
        ++qi;
    }
  gw = 1;
  goto ja;
}

ICEs on aarch64 with -O2 -fno-tree-dce -fno-tree-dse -fchecking=2

<source>: In function 'f':
<source>:4:1: error: invalid 'PHI' argument
    4 | f (void)
      | ^
{CLOBBER(eos)}
cstore_20 = PHI <{CLOBBER(eos)}(8), ak.0_1(9)>
during GIMPLE pass: phiopt
<source>:4:1: internal compiler error: verify_gimple failed