[Bug rtl-optimization/99305] New: [11 Regression] range condition simplification after inlining

[nok.raven at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99305

            Bug ID: 99305
           Summary: [11 Regression] range condition simplification after
                    inlining
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nok.raven at gmail dot com
  Target Milestone: ---

bool foo(char c)
{
    return c >= '0' && c <= '9';
}

bool bar(char c)
{
    return c != '\0' && foo(c);
}

bool foobar(char c)
{
    return c != '\0' && c >= '0' && c <= '9';
}

// GCC 10
bar(char):
  sub edi, 48
  cmp dil, 9
  setbe al
  ret

// GCC 11
bar(char):
  xor eax, eax
  test dil, dil
  je .L3
  sub edi, 48
  cmp dil, 9
  setbe al
.L3:
  ret

https://godbolt.org/z/z4r9cv