[Bug rtl-optimization/102441] [10/11/12 Regression] Incorrect location list in debug info

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102441

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |10.3.1, 11.2.1
             Target|                            |x86_64-*-*
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |7.5.0
            Summary|Incorrect location list in  |[10/11/12 Regression]
                   |debug info                  |Incorrect location list in
                   |                            |debug info
          Component|debug                       |rtl-optimization
   Target Milestone|---                         |10.4
   Last reconfirmed|                            |2021-09-22
           Keywords|                            |wrong-debug
           Priority|P3                          |P2
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
probably a var-tracking issue.  Works with GCC 7 and (noipa doesn't exist):

void __attribute__((noinline,noclone)) not_opt_this(int *r)
{ __asm__ volatile ("" : : :"memory"); }

int __attribute__((noinline)) foo(int x) {
    int r = 0;
    not_opt_this(&r);
    return r;
}

int main (void) {
    return foo (10);
}


GCC 7 prints the correct value, GCC 9 prints <optimized out>