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transforms.interleaver: determine when inlining is not necessary.

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This commit is contained in:
whitequark 2015-11-23 18:08:33 +08:00
parent af43c66149
commit 73845279ae
1 changed files with 19 additions and 4 deletions
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23
artiq/compiler/transforms/interleaver.py
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@ -25,6 +25,9 @@ def delay_free_subgraph(root, limit):
return True
def is_pure_delay(insn):
return isinstance(insn, ir.Builtin) and insn.op in ("delay", "delay_mu")
class Interleaver:
def __init__(self, engine):
self.engine = engine
@ -98,14 +101,26 @@ class Interleaver:
if target_time_delta > 0:
assert isinstance(source_terminator, ir.Delay)
if isinstance(old_decomp, ir.Builtin) and \
old_decomp.op in ("delay", "delay_mu"):
if is_pure_delay(old_decomp):
new_decomp_expr = ir.Constant(target_time_delta, builtins.TInt64())
new_decomp = ir.Builtin("delay_mu", [new_decomp_expr], builtins.TNone())
new_decomp.loc = old_decomp.loc
source_terminator.basic_block.insert(source_terminator, new_decomp)
else:
old_decomp, new_decomp = None, old_decomp
else: # It's a call.
need_to_inline = False
for other_source_block in filter(lambda block: block != source_block,
source_blocks):
other_source_terminator = other_source_block.terminator()
if not (is_pure_delay(other_source_terminator.decomposition()) and \
iodelay.is_const(other_source_terminator.expr) and \
other_source_terminator.expr.fold().value >= source_block_delay):
need_to_inline = True
break
if need_to_inline:
assert False
else:
old_decomp, new_decomp = None, old_decomp
source_terminator.replace_with(ir.Delay(iodelay.Const(target_time_delta), {},
new_decomp, source_terminator.target()))