gh-93223: More aggressive Jump-To-Jump elimination - #93229
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markshannon merged 3 commits intoMay 27, 2022
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sweeneyde
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May 25, 2022
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Lib/test/test_dis.py
| Instruction(opname='POP_JUMP_BACKWARD_IF_FALSE', opcode=175, arg=28, argval=28, argrepr='to 28', offset=82, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=84, starts_line=8, is_jump_target=False, positions=None), | ||
| Instruction(opname='JUMP_FORWARD', opcode=110, arg=14, argval=116, argrepr='to 116', offset=86, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='JUMP_BACKWARD', opcode=140, arg=31, argval=28, argrepr='to 28', offset=88, starts_line=7, is_jump_target=True, positions=None), |
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This instruction gets deleted altogether
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sweeneyde
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May 25, 2022
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Lib/test/test_dis.py
| Instruction(opname='LOAD_FAST', opcode=124, arg=0, argval='i', argrepr='i', offset=72, starts_line=7, is_jump_target=True, positions=None), | ||
| Instruction(opname='LOAD_CONST', opcode=100, arg=3, argval=6, argrepr='6', offset=74, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='COMPARE_OP', opcode=107, arg=4, argval='>', argrepr='>', offset=76, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='POP_JUMP_FORWARD_IF_FALSE', opcode=114, arg=2, argval=88, argrepr='to 88', offset=82, starts_line=None, is_jump_target=False, positions=None), |
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This jump-to-jump gets folded together
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sweeneyde
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May 25, 2022
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Lib/test/test_dis.py
| Instruction(opname='LOAD_CONST', opcode=100, arg=0, argval=None, argrepr='None', offset=262, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='CALL', opcode=171, arg=2, argval=2, argrepr='', offset=264, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='POP_TOP', opcode=1, arg=None, argval=None, argrepr='', offset=274, starts_line=None, is_jump_target=False, positions=None), | ||
| Instruction(opname='JUMP_FORWARD', opcode=110, arg=11, argval=300, argrepr='to 300', offset=276, starts_line=None, is_jump_target=False, positions=None), |
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A jump-to-jump gets eliminated here
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My only concern with this PR is that I would like to remove all backwards conditional jumps: faster-cpython/ideas#297 (comment). |
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#93223