https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124029
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2026-02-08
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> Given this is a relatively straightforward define_split, it is likely a good
> case for Austin to chase down.
Actually it is easier than that
The middle-end has a costing mechism for this already:
```
;; cmp: le, old cst: (const_int 268435455 [0xfffffff]) new cst: (const_int
268435456 [0x10000000])
;; old cst cost: 4, new cst cost: 4
```
You need to implement a COMPARE cost part of the riscv_rtx_costs like it is
done for aarch64_rtx_costs.
It won't be 100% exact because in riscv case there is no COMPARE instruction.
But at least it might be more about the costs of generating which constant and
all.
