forked from M-Labs/artiq
transforms.interleaver: correctly handle degenerate `with parallel:` blocks.
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@ -73,14 +73,23 @@ class Interleaver:
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if postdom_tree is None:
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postdom_tree = domination.PostDominatorTree(func)
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interleave_until = postdom_tree.immediate_dominator(insn.basic_block)
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assert (interleave_until is not None) # no nonlocal flow in `with parallel`
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target_block = insn.basic_block
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target_time = 0
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source_blocks = insn.basic_block.successors()
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source_times = [0 for _ in source_blocks]
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if len(source_blocks) == 1:
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# Immediate dominator for a parallel instruction with one successor
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# is the first instruction in the body of the statement which created
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# it, but below we expect that it would be the first instruction after
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# the statement itself.
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insn.replace_with(ir.Branch(source_blocks[0]))
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continue
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interleave_until = postdom_tree.immediate_dominator(insn.basic_block)
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assert interleave_until is not None # no nonlocal flow in `with parallel`
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assert interleave_until not in source_blocks
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while len(source_blocks) > 0:
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def time_after_block(pair):
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index, block = pair
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