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Reformat.

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whitequark 2015-11-20 21:41:44 +08:00
parent d0f86e05d0
commit cc623c13b4
1 changed files with 46 additions and 44 deletions
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90
artiq/compiler/transforms/interleaver.py
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@ -45,55 +45,57 @@ class Interleaver:
postdom_tree = None
for insn in func.instructions():
if isinstance(insn, ir.Parallel):
# Lazily compute dominators.
if postdom_tree is None:
postdom_tree = domination.PostDominatorTree(func)
if not isinstance(insn, ir.Parallel):
continue
interleave_until = postdom_tree.immediate_dominator(insn.basic_block)
assert (interleave_until is not None) # no nonlocal flow in `with parallel`
# Lazily compute dominators.
if postdom_tree is None:
postdom_tree = domination.PostDominatorTree(func)
target_block = insn.basic_block
target_time = 0
source_blocks = insn.basic_block.successors()
source_times = [0 for _ in source_blocks]
interleave_until = postdom_tree.immediate_dominator(insn.basic_block)
assert (interleave_until is not None) # no nonlocal flow in `with parallel`
while len(source_blocks) > 0:
def iodelay_of_block(block):
terminator = block.terminator()
if isinstance(terminator, ir.Delay):
# We should be able to fold everything without free variables.
assert iodelay.is_const(terminator.expr)
return terminator.expr.value
else:
return 0
target_block = insn.basic_block
target_time = 0
source_blocks = insn.basic_block.successors()
source_times = [0 for _ in source_blocks]
def time_after_block(pair):
index, block = pair
return source_times[index] + iodelay_of_block(block)
index, source_block = min(enumerate(source_blocks), key=time_after_block)
source_block_delay = iodelay_of_block(source_block)
target_terminator = target_block.terminator()
if isinstance(target_terminator, (ir.Delay, ir.Branch)):
target_terminator.set_target(source_block)
elif isinstance(target_terminator, ir.Parallel):
target_terminator.replace_with(ir.Branch(source_block))
while len(source_blocks) > 0:
def iodelay_of_block(block):
terminator = block.terminator()
if isinstance(terminator, ir.Delay):
# We should be able to fold everything without free variables.
assert iodelay.is_const(terminator.expr)
return terminator.expr.value
else:
assert False
return 0
new_source_block = postdom_tree.immediate_dominator(source_block)
assert (new_source_block is not None)
assert delay_free_subgraph(source_block, new_source_block)
def time_after_block(pair):
index, block = pair
return source_times[index] + iodelay_of_block(block)
target_block = source_block
target_time += source_block_delay
index, source_block = min(enumerate(source_blocks), key=time_after_block)
source_block_delay = iodelay_of_block(source_block)
if new_source_block == interleave_until:
# We're finished with this branch.
del source_blocks[index]
del source_times[index]
else:
source_blocks[index] = new_source_block
source_times[index] = target_time
target_terminator = target_block.terminator()
if isinstance(target_terminator, (ir.Delay, ir.Branch)):
target_terminator.set_target(source_block)
elif isinstance(target_terminator, ir.Parallel):
target_terminator.replace_with(ir.Branch(source_block))
else:
assert False
target_block = source_block
target_time += source_block_delay
new_source_block = postdom_tree.immediate_dominator(source_block)
assert (new_source_block is not None)
assert delay_free_subgraph(source_block, new_source_block)
if new_source_block == interleave_until:
# We're finished with this branch.
del source_blocks[index]
del source_times[index]
else:
source_blocks[index] = new_source_block
source_times[index] = target_time