https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112935
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
/* Default RTX cost initializer. */
...
int_mult_si (COSTS_N_INSNS (1)),
int_mult_di (COSTS_N_INSNS (1)),
That seems wrong.
I suspect you will get other improvements when you touch this.
E.g.
```
int f(int t)
{
return t * 17;
}
```
Should really be:
shift followed by an add.
But currently is just a mult.
What is interesting is I think -Os cost is the opposite from the -O2 cost ...
That is -Os produces the better code generation due to the cost for mult being
set to 4:
/* RTX costs to use when optimizing for size. */
...
.int_mult_si_ (4)
.int_mult_di_ (4)
