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bpo-29469: Remove unnecessary peephole optimizer (GH-4863) 

Conversions like `not a is b -> a is not b` are implemented
in AST optimizer in previous commit (7ea143a).
So this commit removes them from peephole optimizer.
This commit is contained in:
INADA Naoki 2017-12-14 22:18:26 +09:00 committed by GitHub
parent 374c6e178a
commit eadad1b97f
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1 changed files with 0 additions and 15 deletions
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Python/peephole.c
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@ -345,21 +345,6 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names,
in_consts = 0;
switch (opcode) {
/* not a is b --> a is not b
not a in b --> a not in b
not a is not b --> a is b
not a not in b --> a in b
*/
case COMPARE_OP:
j = get_arg(codestr, i);
if (j < 6 || j > 9 ||
nextop != UNARY_NOT ||
!ISBASICBLOCK(blocks, op_start, i + 1))
break;
codestr[i] = PACKOPARG(opcode, j^1);
fill_nops(codestr, i + 1, nexti + 1);
break;
/* Skip over LOAD_CONST trueconst
POP_JUMP_IF_FALSE xx. This improves
"while 1" performance. */