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bpo-30501: Make the compiler producing optimized code for condition expressions. (#1851)

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Serhiy Storchaka 2017-06-11 14:50:22 +03:00 • committed by GitHub
parent 1efbf92e90
commit 36ff451eba
5 changed files with 2540 additions and 2451 deletions
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14
Python/peephole.c
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@ -492,16 +492,6 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names,
in_consts = 0;
switch (opcode) {
/* Replace UNARY_NOT POP_JUMP_IF_FALSE
with POP_JUMP_IF_TRUE */
case UNARY_NOT:
if (nextop != POP_JUMP_IF_FALSE
|| !ISBASICBLOCK(blocks, op_start, i + 1))
break;
fill_nops(codestr, op_start, i + 1);
codestr[nexti] = PACKOPARG(POP_JUMP_IF_TRUE, _Py_OPARG(codestr[nexti]));
break;
/* not a is b --> a is not b
not a in b --> a not in b
not a is not b --> a is b
@ -626,10 +616,10 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names,
result of the first test implies the success of a similar
test or the failure of the opposite test.
Arises in code like:
"if a and b:"
"if a or b:"
"a and b or c"
"(a and b) and c"
"(a or b) or c"
"(a or b) and c"
x:JUMP_IF_FALSE_OR_POP y y:JUMP_IF_FALSE_OR_POP z
--> x:JUMP_IF_FALSE_OR_POP z
x:JUMP_IF_FALSE_OR_POP y y:JUMP_IF_TRUE_OR_POP z