[Bug tree-optimization/101466] Optimizers should fold bounds checking for -D_GLIBCXX_ASSERTIONS=1

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101466

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-07-15
             Status|UNCONFIRMED                 |NEW
           Severity|normal                      |enhancement
           Keywords|                            |missed-optimization
            Summary|Optimizers should fold      |Optimizers should fold
                   |bounds checking for         |bounds checking for
                   |-D_GLIBCXX_ASSERTIONS=1 +   |-D_GLIBCXX_ASSERTIONS=1
                   |--disable-libstdcxx-verbose |
     Ever confirmed|0                           |1

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
extern void g() __attribute__((noreturn));

void square(int t, int *tt)
{
    if (t == 0)  g();
    tt[0] = 0;
    if (t == 1)  g();
    tt[1] = 0;
    if (t == 2)  g();
    tt[2] = 0;
    if (t == 3)   g();
    tt[3] = 0;
    if (t == 4)  g();
    tt[4] = 0;
}