[Bug c/106138] New: Inefficient code generation for cases when results can be deduced at compile time

[pavel.morozkin at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106138

            Bug ID: 106138
           Summary: Inefficient code generation for cases when results can
                    be deduced at compile time
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pavel.morozkin at gmail dot com
  Target Milestone: ---

_Bool f(char x)
{
    _Bool b1 = x == 4;
    _Bool b2 = x & 0x3;
    return b1 && b2;
}

Invocation: gcc -O3

Actual generated code:
f:
        test    dil, 3
        setne   al
        cmp     dil, 4
        sete    dl
        and     eax, edx
        ret

Expected generated code:
f:
        xor     eax, eax
        ret

The Summary needs to be adjusted perhaps.