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

[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]

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;
}

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

[pinskia at gcc dot gnu.org]

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

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Same problem as PR 110252 so dup.

phiopt match-simplify trying:
        _2 != _5 ? 1 : _15
Matching expression match.pd:1991, gimple-match-5.cc:23
Matching expression match.pd:1991, gimple-match-5.cc:23
Matching expression match.pd:2480, gimple-match-4.cc:35
Matching expression match.pd:2483, gimple-match-3.cc:66
Applying pattern match.pd:4763, gimple-match-7.cc:16232
Folded into the sequence:
_14 = _2 != _5;
_8 = (int) _14;
_7 = _8 | _15;
statement un-sinked:
_15 = _2;
Removing basic block 3
;; basic block 3, loop depth 0
;;  pred:       2
;;  succ:       4


  # RANGE [irange] int [0, 1] MASK 0x1 VALUE 0x0
  _15 = _2;

*** This bug has been marked as a duplicate of bug 110252 ***