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Avoid fuzzing with multiple --flatten operations, which causes exponential overhead #2345

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Merged
kripken merged 1 commit into from
Sep 18, 2019
Merged

Avoid fuzzing with multiple --flatten operations, which causes exponential overhead #2345

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7 changes: 6 additions & 1 deletion scripts/fuzz_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -511,7 +511,11 @@ def get_multiple_opt_choices():
ret = []
# core opts
while 1:
ret += random.choice(opt_choices)
choice = random.choice(opt_choices)
if '--flatten' in ret and '--flatten' in choice:
print('avoiding multiple --flatten in a single command, due to exponential overhead')
else:
ret += choice
if len(ret) > 20 or random.random() < 0.3:
break
# modifiers (if not already implied by a -O? option)
Expand All @@ -520,6 +524,7 @@ def get_multiple_opt_choices():
ret += ['--optimize-level=' + str(random.randint(0, 3))]
if random.random() < 0.5:
ret += ['--shrink-level=' + str(random.randint(0, 3))]
assert ret.count('--flatten') <= 1
return ret


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