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wrpll/thls: implement global writeback

This commit is contained in:
Sebastien Bourdeauducq 2019-08-15 23:16:17 +08:00
parent 24082b687e
commit 1fd2322662
1 changed files with 28 additions and 9 deletions
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37
artiq/gateware/wrpll/thls.py
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@ -3,6 +3,7 @@ import ast
from copy import copy from copy import copy
import operator import operator
from functools import reduce from functools import reduce
from collections import OrderedDict
from migen import * from migen import *
from migen.genlib.fsm import * from migen.genlib.fsm import *
@ -73,7 +74,7 @@ class ASTCompiler:
self.next_ssa_reg = -1 self.next_ssa_reg = -1
self.constants = dict() self.constants = dict()
self.names = dict() self.names = dict()
self.globals = dict() self.globals = OrderedDict()
def get_ssa_reg(self): def get_ssa_reg(self):
r = self.next_ssa_reg r = self.next_ssa_reg
@ -81,11 +82,11 @@ class ASTCompiler:
return r return r
def add_global(self, name): def add_global(self, name):
r = len(self.data) if name not in self.globals:
self.data.append(0) r = len(self.data)
self.names[name] = r self.data.append(0)
self.globals[name] = r self.names[name] = r
return r self.globals[name] = r
def input(self, name): def input(self, name):
target = self.get_ssa_reg() target = self.get_ssa_reg()
@ -266,11 +267,20 @@ class Scheduler:
return False return False
if isn.outputs: if isn.outputs:
# check that exit slot is free
latency = self.processor.get_instruction_latency(isn) latency = self.processor.get_instruction_latency(isn)
exit = cycle + latency exit = cycle + latency
if exit in self.exits: if exit in self.exits:
return False return False
# avoid RAW hazard with global writeback
for output in isn.outputs:
if output >= 0:
for risn in self.remaining:
for inp in risn.inputs:
if inp == output:
return False
# Instruction can be scheduled # Instruction can be scheduled
self.remaining.remove(isn) self.remaining.remove(isn)
@ -282,7 +292,10 @@ class Scheduler:
if isn.outputs: if isn.outputs:
assert len(isn.outputs) == 1 assert len(isn.outputs) == 1
output = self.allocate_register() if isn.outputs[0] < 0:
output = self.allocate_register()
else:
output = isn.outputs[0]
self.exits[exit] = (isn.outputs[0], output) self.exits[exit] = (isn.outputs[0], output)
self.output.append(isn.__class__(immediate=isn.immediate, inputs=mapped_inputs)) self.output.append(isn.__class__(immediate=isn.immediate, inputs=mapped_inputs))
@ -352,6 +365,10 @@ def compile(processor, function):
astcompiler.emit(node) astcompiler.emit(node)
if isinstance(node, ast.Return): if isinstance(node, ast.Return):
break break
for glbl, location in astcompiler.globals.items():
new_location = astcompiler.names[glbl]
if new_location != location:
astcompiler.program.append(CopyIsn(inputs=[new_location], outputs=[location]))
scheduler = Scheduler(processor, len(astcompiler.data), astcompiler.program) scheduler = Scheduler(processor, len(astcompiler.data), astcompiler.program)
scheduler.schedule() scheduler.schedule()
@ -585,7 +602,9 @@ def foo(x):
def simple_test(x): def simple_test(x):
return min((x*-2 >> 1) + 2 - 1000, 10) global a
a = a + (x*4 >> 1)
return a
if __name__ == "__main__": if __name__ == "__main__":
@ -614,4 +633,4 @@ if __name__ == "__main__":
callback((yield proc_impl.output)) callback((yield proc_impl.output))
yield yield
run_simulation(proc_impl, [send_values([42, 40]), receive_values(print)]) run_simulation(proc_impl, [send_values([42, 40, 10, 10]), receive_values(print)])