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transforms/unroll_loop: do not unroll breakable loops

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This commit is contained in:
Sebastien Bourdeauducq 2014-09-18 09:53:08 +08:00
parent d52d641dcd
commit 5fe3cffc84
1 changed files with 20 additions and 2 deletions
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22
artiq/transforms/unroll_loops.py
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@ -14,6 +14,24 @@ def _count_stmts(node):
return 1
def _loop_breakable(node):
if isinstance(node, ast.Break):
return 1
elif isinstance(node, ast.Return):
return 2
elif isinstance(node, list):
return max(map(_loop_breakable, node), default=0)
elif isinstance(node, ast.If):
return max(_loop_breakable(node.body), _loop_breakable(node.orelse))
elif isinstance(node, (ast.For, ast.While)):
bb = _loop_breakable(node.body)
if bb == 1:
bb = 0
return max(bb, _loop_breakable(node.orelse))
else:
return 0
class _LoopUnroller(ast.NodeTransformer):
def __init__(self, limit):
self.limit = limit
@ -26,8 +44,8 @@ class _LoopUnroller(ast.NodeTransformer):
return node
l_it = len(it)
if l_it:
n = l_it*_count_stmts(node.body)
if n < self.limit:
if (not _loop_breakable(node.body)
and l_it*_count_stmts(node.body) < self.limit):
replacement = []
for i in it:
if not isinstance(i, int):