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


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.


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