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When the single branch target of a block has been removed try updating it to target a block that is kept (by scanning forward in the sequence) instead of replacing the branch with a return instruction. Doing so reduces the risk of breaking loop structures meaning that when the loop is 'interesting' these reductions should have more blocks eliminated. Differential Revision: https://reviews.llvm.org/D125766
16 lines
376 B
Python
Executable File
16 lines
376 B
Python
Executable File
import subprocess
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import sys
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opt = subprocess.run( [ 'opt', '-passes=print<loops>','-disable-output', sys.argv[1]], stdout=subprocess.PIPE, stderr=subprocess.PIPE )
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stdout = opt.stdout.decode()
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pattern = 'Loop at depth 1 containing'
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if (pattern in opt.stderr.decode()):
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print('This is interesting!')
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sys.exit(0)
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else:
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print('This is NOT interesting!')
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sys.exit(1)
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