transform: explicit delays and unroll for loops

This commit is contained in:
Sebastien Bourdeauducq 2014-05-25 13:31:02 +02:00
parent e3620cc61f
commit 08ff5154a8
2 changed files with 115 additions and 48 deletions

13
examples/collapse_test.py Normal file
View File

@ -0,0 +1,13 @@
def collapse_test():
for i in range(3):
with parallel:
with sequential:
pulse("a", 100*MHz, 10*us)
delay(10*us)
pulse("b", 100*MHz, 10*us)
delay(20*us)
with sequential:
pulse("a", 100*MHz, 10*us)
delay(10*us)
pulse("b", 100*MHz, 10*us)
delay(10*us)

View File

@ -2,55 +2,109 @@ import inspect, textwrap, ast
from artiq import units, unparse
_now = "_ARTIQ_now"
def find_kernel_body(node):
while True:
if isinstance(node, ast.Module):
if len(node.body) != 1:
raise TypeError
node = node.body[0]
elif isinstance(node, ast.FunctionDef):
return node.body
else:
raise TypeError
class _RequestTransformer(ast.NodeTransformer):
def __init__(self, target_globals):
self.target_globals = target_globals
def eval_ast(expr, symdict=dict()):
if not isinstance(expr, ast.Expression):
expr = ast.Expression(expr)
code = compile(expr, "<ast>", "eval")
return eval(code, symdict)
def visit_FunctionDef(self, node):
self.generic_visit(node)
node.body.insert(0, ast.copy_location(
ast.Assign(targets=[ast.Name(id=_now, ctx=ast.Store())],
value=ast.Num(n=0)), node))
node.body.append(ast.copy_location(
ast.Return(value=ast.Name(id=_now, ctx=ast.Store())),
node))
return node
def visit_Return(self, node):
raise TypeError("Kernels cannot return values")
def visit_Call(self, node):
self.generic_visit(node)
name = node.func.id
if name == "delay":
if len(node.args) != 1:
raise TypeError("delay() takes 1 positional argument but {} were given".format(len(node.args)))
return ast.copy_location(ast.AugAssign(
target=ast.Name(id=_now, ctx=ast.Store()),
op=ast.Add(), value=node.args[0]), node)
return node
def visit_Name(self, node):
if not isinstance(node.ctx, ast.Load):
return node
def _try_eval_with_units(node):
try:
obj = self.target_globals[node.id]
except KeyError:
r = eval_ast(node, units.__dict__)
except:
return node
if isinstance(obj, units.Quantity):
return ast.Num(obj.amount)
if isinstance(r, units.Quantity):
return ast.copy_location(ast.Num(n=r.amount), node)
else:
return node
def request_transform(target_ast, target_globals):
transformer = _RequestTransformer(target_globals)
transformer.visit(target_ast)
def explicit_delays(stmts):
insertions = []
for i, stmt in enumerate(stmts):
if isinstance(stmt, (ast.For, ast.While, ast.If)):
explicit_delays(stmt.body)
explicit_delays(stmt.orelse)
elif isinstance(stmt, ast.With):
explicit_delays(stmt.body)
elif isinstance(stmt, ast.Expr):
if not isinstance(stmt.value, ast.Call) or not isinstance(stmt.value.func, ast.Name):
continue
call = stmt.value
name = call.func.id
if name == "delay":
call.args[0] = _try_eval_with_units(call.args[0])
elif name == "pulse":
call.func.id = "pulse_start"
insertions.append((i+1, ast.copy_location(
ast.Expr(ast.Call(func=ast.Name(id="delay", ctx=ast.Load()),
args=[_try_eval_with_units(call.args[2])],
keywords=[], starargs=[], kwargs=[])),
stmt)))
for i, (location, stmt) in enumerate(insertions):
stmts.insert(location+i, stmt)
def _count_stmts(node):
if isinstance(node, (ast.For, ast.While, ast.If)):
print(ast.dump(node))
return 1 + _count_stmts(node.body) + _count_stmts(node.orelse)
elif isinstance(node, ast.With):
return 1 + _count_stmts(node.body)
elif isinstance(node, list):
return sum(map(_count_stmts, node))
else:
return 1
def unroll_loops(stmts, limit):
replacements = []
for stmt_i, stmt in enumerate(stmts):
if isinstance(stmt, ast.For):
try:
it = eval_ast(stmt.iter)
except:
pass
else:
unroll_loops(stmt.body, limit)
n = len(it)*_count_stmts(stmt.body)
if n < limit:
replacement = []
for i in it:
if not isinstance(i, int):
replacement = None
break
replacement.append(ast.copy_location(
ast.Assign(targets=[stmt.target], value=ast.Num(n=i)), stmt))
replacement += stmt.body
if replacement is not None:
replacements.append((stmt_i, replacement))
if isinstance(stmt, (ast.While, ast.If)):
unroll_loops(stmt.body, limit)
unroll_loops(stmt.orelse, limit)
elif isinstance(stmt, ast.With):
unroll_loops(stmt.body, limit)
offset = 0
for location, new_stmts in replacements:
stmts[offset+location:offset+location+1] = new_stmts
offset += len(new_stmts) - 1
if __name__ == "__main__":
import threads_test
kernel = threads_test.threads_test
a = ast.parse(textwrap.dedent(inspect.getsource(kernel)))
request_transform(a, kernel.__globals__)
unparse.Unparser(a)
import collapse_test
kernel = collapse_test.collapse_test
node = ast.parse(textwrap.dedent(inspect.getsource(kernel)))
node = find_kernel_body(node)
explicit_delays(node)
unroll_loops(node, 50)
unparse.Unparser(node)