[Bug tree-optimization/103376] New: wrong code at -Os and above on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103376

            Bug ID: 103376
           Summary: wrong code at -Os and above on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It appears to be a recent regression.

[603] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211123 (experimental) [master r12-5461-gcab8f69857d] (GCC) 
[604] % 
[604] % gcctk -O1 small.c; ./a.out
[605] % 
[605] % gcctk -Os small.c
[606] % ./a.out
Aborted
[607] % 
[607] % cat small.c
int printf(const char *, ...);
long long a = 7108473123;
int b, c, *d;
int main() {
  long long e, f;
  e = a;
  if (b) {
    printf("%d", c);
    d = 0;
    while (*d)
      ;
  }
  f = 0x88582324C7C1E17B;
  a = ~-(e ^ f ^ ~a) ^ ~18013;
  if (a > -8622102845723662559LL)
    __builtin_abort();
}