[Bug rtl-optimization/66420] valgrind error in improve_allocation

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66420

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Vladimir Makarov from comment #2)
>   I reproduced the problem with --eanble-checking=valgrind.  The valgrind
> message refers for 
> 
>       if ((hregno = ALLOCNO_HARD_REGNO (a)) < 0)
>         base_cost = ALLOCNO_UPDATED_MEMORY_COST (a);
> 

Suggest print out or display the value of 'a' and the value of
ALLOCNO_HARD_REGNO (a) just before the if statement.

Something like

    fprintf( stderr, "a %p\n", a);
    fprintf( stderr, "ALLOCNO_HARD_REGNO(a) %d\n", ALLOCNO_HARD_REGNO(a));

valgrind should detect which one of these two is in error.