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bpo-46528: Simplify BUILD_TUPLE/UNPACK_SEQUENCE folding (GH-31039)

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Brandt Bucher 2022-02-01 13:41:32 -08:00 • committed by GitHub
parent bebaa95fd0
commit a0e55a571c
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2 changed files with 8 additions and 15 deletions
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2
Lib/test/test_peepholer.py
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@ -126,7 +126,7 @@ def test_pack_unpack(self):
code = compile(line,'','single')
self.assertInBytecode(code, elem)
self.assertNotInBytecode(code, 'BUILD_TUPLE')
self.assertNotInBytecode(code, 'UNPACK_TUPLE')
self.assertNotInBytecode(code, 'UNPACK_SEQUENCE')
self.check_lnotab(code)
def test_folding_of_tuples_of_constants(self):

21
Python/compile.c
View file

@ -8661,29 +8661,22 @@ optimize_basic_block(struct compiler *c, basicblock *bb, PyObject *consts)
}
/* Try to fold tuples of constants.
Skip over BUILD_SEQN 1 UNPACK_SEQN 1.
Replace BUILD_SEQN 2 UNPACK_SEQN 2 with ROT2.
Replace BUILD_SEQN 3 UNPACK_SEQN 3 with ROT3 ROT2. */
Skip over BUILD_TUPLE(1) UNPACK_SEQUENCE(1).
Replace BUILD_TUPLE(2) UNPACK_SEQUENCE(2) with SWAP(2).
Replace BUILD_TUPLE(3) UNPACK_SEQUENCE(3) with SWAP(3). */
case BUILD_TUPLE:
if (nextop == UNPACK_SEQUENCE && oparg == bb->b_instr[i+1].i_oparg) {
switch(oparg) {
case 1:
inst->i_opcode = NOP;
bb->b_instr[i+1].i_opcode = NOP;
break;
continue;
case 2:
inst->i_opcode = SWAP;
inst->i_oparg = 2;
bb->b_instr[i+1].i_opcode = NOP;
i--;
break;
case 3:
inst->i_opcode = SWAP;
inst->i_oparg = 3;
bb->b_instr[i+1].i_opcode = NOP;
i--;
inst->i_opcode = NOP;
bb->b_instr[i+1].i_opcode = SWAP;
continue;
}
break;
}
if (i >= oparg) {
if (fold_tuple_on_constants(c, inst-oparg, oparg, consts)) {