[Bug tree-optimization/110599] New: wrong code at -Os and above with "-fno-tree-forwprop -fno-tree-fre" on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110599

            Bug ID: 110599
           Summary: wrong code at -Os and above with "-fno-tree-forwprop
                    -fno-tree-fre" 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: ---

This appears to be a recent regression.

Compiler Explorer: https://godbolt.org/z/jdrTeEser

[501] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230708 (experimental) (GCC) 
[502] % 
[502] % gcctk -O2 small.c; ./a.out
1
[503] % gcctk -O2 -fno-tree-forwprop -fno-tree-fre small.c; ./a.out
-1
[504] % cat small.c
int printf(const char *, ...);
int a, b;
int main() {
  b = ~b;
  a = b ^ (a && 1) || b;
  printf("%d\n", a);
  return 0;
}