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Move NOP to end of code transformation.

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Raymond Hettinger 2004-06-24 09:25:39 +00:00
parent b86aa99eb9
commit 43ea47ff06
1 changed files with 7 additions and 3 deletions
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10
Python/compile.c
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@ -392,7 +392,8 @@ optimize_code(PyObject *code, PyObject* consts)
opcode = codestr[i]; opcode = codestr[i];
switch (opcode) { switch (opcode) {
/* Replace UNARY_NOT JUMP_IF_FALSE with NOP JUMP_IF_TRUE */ /* Replace UNARY_NOT JUMP_IF_FALSE POP_TOP with
with JUMP_IF_TRUE POP_TOP NOP */
case UNARY_NOT: case UNARY_NOT:
if (codestr[i+1] != JUMP_IF_FALSE || if (codestr[i+1] != JUMP_IF_FALSE ||
codestr[i+4] != POP_TOP || codestr[i+4] != POP_TOP ||
@ -401,8 +402,11 @@ optimize_code(PyObject *code, PyObject* consts)
tgt = GETJUMPTGT(codestr, (i+1)); tgt = GETJUMPTGT(codestr, (i+1));
if (codestr[tgt] != POP_TOP) if (codestr[tgt] != POP_TOP)
continue; continue;
codestr[i] = NOP; j = GETARG(codestr, i+1) + 1;
codestr[i+1] = JUMP_IF_TRUE; codestr[i] = JUMP_IF_TRUE;
SETARG(codestr, i, j);
codestr[i+3] = POP_TOP;
codestr[i+4] = NOP;
break; break;
/* not a is b --> a is not b /* not a is b --> a is not b