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Fix delete_pass to delete the loop if the body is empty #212

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merged 1 commit into from
Jul 14, 2022
Merged

Fix delete_pass to delete the loop if the body is empty #212

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6 changes: 6 additions & 0 deletions src/exo/LoopIR_scheduling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2516,6 +2516,12 @@ class _DoDeletePass(LoopIR_Rewrite):
def map_s(self, s):
if isinstance(s, LoopIR.Pass):
return []
elif isinstance(s, (LoopIR.ForAll, LoopIR.Seq)):
body = self.map_stmts(s.body)
if not body:
return []
else:
return [s.update(body=body)]
else:
return super().map_s(s)

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2 changes: 2 additions & 0 deletions tests/golden/test_schedules/test_delete_pass.txt
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@@ -0,0 +1,2 @@
def foo(x: R @ DRAM):
x = 0.0
17 changes: 17 additions & 0 deletions tests/test_schedules.py
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Expand Up @@ -7,6 +7,23 @@
from exo.parse_fragment import ParseFragmentError


def test_delete_pass(golden):
@proc
def foo(x : R):
pass
x = 0.0

assert str(foo.delete_pass()) == golden

@proc
def foo(x : R):
for i in seq(0, 16):
for j in seq(0, 2):
pass
x = 0.0

assert str(foo.delete_pass()) == golden

def test_add_loop1(golden):
@proc
def foo():
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