mirror of https://github.com/python/cpython
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#include "Python.h"
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#include "opcode.h"
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#include "pycore_interp.h"
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#include "pycore_opcode_metadata.h"
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#include "pycore_opcode_utils.h"
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#include "pycore_pystate.h" // _PyInterpreterState_GET()
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#include "pycore_uops.h"
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#include "pycore_long.h"
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#include "cpython/optimizer.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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#include "pycore_optimizer.h"
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static void
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remove_unneeded_uops(_PyUOpInstruction *buffer, int buffer_size)
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{
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// Note that we don't enter stubs, those SET_IPs are needed.
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int last_set_ip = -1;
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bool maybe_invalid = false;
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for (int pc = 0; pc < buffer_size; pc++) {
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int opcode = buffer[pc].opcode;
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if (opcode == _SET_IP) {
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buffer[pc].opcode = NOP;
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last_set_ip = pc;
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}
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else if (opcode == _CHECK_VALIDITY) {
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if (maybe_invalid) {
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maybe_invalid = false;
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}
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else {
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buffer[pc].opcode = NOP;
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}
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}
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else if (opcode == _JUMP_TO_TOP || opcode == _EXIT_TRACE) {
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break;
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}
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else {
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if (OPCODE_HAS_ESCAPES(opcode)) {
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maybe_invalid = true;
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if (last_set_ip >= 0) {
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buffer[last_set_ip].opcode = _SET_IP;
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}
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}
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if (OPCODE_HAS_ERROR(opcode) || opcode == _PUSH_FRAME) {
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if (last_set_ip >= 0) {
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buffer[last_set_ip].opcode = _SET_IP;
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}
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}
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}
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}
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}
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int
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_Py_uop_analyze_and_optimize(
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PyCodeObject *co,
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_PyUOpInstruction *buffer,
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int buffer_size,
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int curr_stacklen
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)
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{
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remove_unneeded_uops(buffer, buffer_size);
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return 0;
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}
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