Describe instructions with same reg in def and use or mutiple defs and attach write latency

[Segher Boessenkool]

Hi!

On Thu, Feb 03, 2022 at 05:06:23PM -0800, Reshabh K Sharma wrote:
> On Fri, Jan 28, 2022 at 10:23 AM Segher Boessenkool <
> segher@kernel.crashing.org> wrote:
> > You can use TARGET_SCHED_ADJUST_COST?
> 
> Thank you so much! I think target_sched_adjust_cost will do.
> Given two rtx_insn,
> x = exp_load addr offset and
> y = add addr z,
> these two instructions are the input arguments to target_sched_adjust_cost,
> 
> how do I check that given rtx_insn is exp_load? (how do we check if
> rtx_insn is of type exp_load, add or any other target specific instruction?)
> and how do I check if there is a read after read dependency for addr
> operand and not the offset.

"type" is just an insn attribute, so you would use
  if (get_attr_type (insn) == TYPE_EXP_LOAD)
or similar.


Segher