Re: [PATCH][ARM] Add debug dumping of cost table fields

[Kyrill Tkachov <kyrylo dot tkachov at arm dot com>]

Ping.
https://gcc.gnu.org/ml/gcc-patches/2015-05/msg00054.html

Thanks,
Kyrill
On 01/05/15 15:31, Kyrill Tkachov wrote:
> Hi all,
>
> This patch adds a macro to wrap cost field accesses into a helpful debug dump,
> saying which field is being accessed at what line and with what values.
> This helped me track down cases where the costs were doing the wrong thing
> by allowing me to see which path in arm_new_rtx_costs was taken.
> For example, the combine log might now contain:
>
> Trying 2 -> 6:
> Successfully matched this instruction:
> (set (reg:SI 115 [ D.5348 ])
>       (neg:SI (reg:SI 0 r0 [ a ])))
> using extra_cost->alu.arith with cost 0 from line 10506
>
> which can be useful in debugging the rtx costs.
>
> Bootstrapped and tested on arm.
>
> Ok for trunk?
>
> Thanks,
> Kyrill
>
>
> 2015-05-01  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
>
>       * config/arm/arm.c (DBG_COST): New macro.
>       (arm_new_rtx_costs): Use above.