Multiple Entry into @update_once block

[Enze]

I've constructed the following, minimal example source file:

# Begin File tb3.py

from pymtl3 import *

class dut(Component):

  def construct(s):

    @update_once

    def next_cycle1():

      print("entering update_once block")

my_tb = dut()

my_tb.apply(DefaultPassGroup())

my_tb.sim_reset()

for i in range(4):

  print("Iteration:" + str(i))

  my_tb.sim_tick()

print("Sim Done")

# End File

I expect the line "entering update_once block" to print once per clock cycle. However, when I run this, I see the following console output:

$ python tb3.py

entering update_once block

entering update_once block

entering update_once block

entering update_once block

Iteration:0

entering update_once block

entering update_once block

Iteration:1

entering update_once block

entering update_once block

Iteration:2

entering update_once block

entering update_once block

Iteration:3

entering update_once block

entering update_once block

Sim Done

This is with python 3.8.2. It appears that this block is scheduled twice per clock cycle Am I misunderstanding how to use the @update_once block?

Thanks

[Christopher Batten]

Hmmm ... this seems interesting. The initially four executions of the update block are happening during reset, but I am surprised the update_once block happens twice per cycle when you are calling `sim_tick()` ... we will take a look awn get back to you this week!

Best,
-c

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[Shunning Jiang]

Thanks for the report. I finally got a chance to fix it on master.

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Shunning Jiang

Ph.D. Candidate 

Computer Systems Laboratory

School of Electrical and Computer Engineering

Cornell University

http://www.csl.cornell.edu/~shunning