10BC0 gh-102859: Remove JUMP_IF_FALSE_OR_POP and JUMP_IF_TRUE_OR_POP (#102870) · python/cpython@3468c76 · GitHub
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gh-102859: Remove JUMP_IF_FALSE_OR_POP and JUMP_IF_TRUE_OR_POP (#102870)
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‎Doc/library/dis.rst‎

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@@ -1152,30 +1152,6 @@ iterations of the loop.
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.. versionchanged:: 3.12
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This is no longer a pseudo-instruction.
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.. opcode:: JUMP_IF_TRUE_OR_POP (delta)
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If ``STACK[-1]`` is true, increments the bytecode counter by *delta* and leaves
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``STACK[-1]`` on the stack. Otherwise (``STACK[-1]`` is false), ``STACK[-1]``
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is popped.
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.. versionadded:: 3.1
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.. versionchanged:: 3.11
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The oparg is now a relative delta rather than an absolute target.
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.. opcode:: JUMP_IF_FALSE_OR_POP (delta)
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If ``STACK[-1]`` is false, increments the bytecode counter by *delta* and leaves
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``STACK[-1]`` on the stack. Otherwise (``STACK[-1]`` is true), ``STACK[-1]`` is
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popped.
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.. versionadded:: 3.1
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.. versionchanged:: 3.11
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The oparg is now a relative delta rather than an absolute target.
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.. opcode:: FOR_ITER (delta)
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``STACK[-1]`` is an :term:`iterator`. Call its :meth:`~iterator.__next__` method.

‎Doc/whatsnew/3.12.rst‎

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@@ -435,6 +435,9 @@ CPython bytecode changes
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:opcode:`LOAD_METHOD` instruction if the low bit of its oparg is set.
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(Contributed by Ken Jin in :gh:`93429`.)
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* Removed the :opcode:`JUMP_IF_FALSE_OR_POP` and :opcode:`JUMP_IF_TRUE_OR_POP`
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instructions. (Contributed by Irit Katriel in :gh:`102859`.)
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Demos and Tools
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===============

‎Include/internal/pycore_opcode.h‎

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‎Include/opcode.h‎

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‎Lib/importlib/_bootstrap_external.py‎

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@@ -435,6 +435,7 @@ def _write_atomic(path, data, mode=0o666):
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# Python 3.12a6 3519 (Modify SEND instruction)
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# Python 3.12a6 3520 (Remove PREP_RERAISE_STAR, add CALL_INTRINSIC_2)
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# Python 3.12a7 3521 (Shrink the LOAD_GLOBAL caches)
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# Python 3.12a7 3522 (Removed JUMP_IF_FALSE_OR_POP/JUMP_IF_TRUE_OR_POP)
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# Python 3.13 will start with 3550
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@@ -451,7 +452,7 @@ def _write_atomic(path, data, mode=0o666):
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# Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
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# in PC/launcher.c must also be updated.
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454-
MAGIC_NUMBER = (3521).to_bytes(2, 'little') + b'\r\n'
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MAGIC_NUMBER = (3522).to_bytes(2, 'little') + b'\r\n'
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_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
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‎Lib/opcode.py‎

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@@ -154,8 +154,6 @@ def pseudo_op(name, op, real_ops):
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name_op('IMPORT_NAME', 108) # Index in name list
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name_op('IMPORT_FROM', 109) # Index in name list
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jrel_op('JUMP_FORWARD', 110) # Number of words to skip
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jrel_op('JUMP_IF_FALSE_OR_POP', 111) # Number of words to skip
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jrel_op('JUMP_IF_TRUE_OR_POP', 112) # ""
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jrel_op('POP_JUMP_IF_FALSE', 114)
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jrel_op('POP_JUMP_IF_TRUE', 115)
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name_op('LOAD_GLOBAL', 116) # Index in name list

‎Lib/test/test__opcode.py‎

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@@ -34,10 +34,6 @@ def test_stack_effect(self):
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self.assertRaises(ValueError, stack_effect, code, 0)
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def test_stack_effect_jump(self):
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JUMP_IF_TRUE_OR_POP = dis.opmap['JUMP_IF_TRUE_OR_POP']
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self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0), 0)
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self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0, jump=True), 0)
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self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0, jump=False), -1)
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FOR_ITER = dis.opmap['FOR_ITER']
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self.assertEqual(stack_effect(FOR_ITER, 0), 1)
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self.assertEqual(stack_effect(FOR_ITER, 0, jump=True), 1)

‎Lib/test/test_peepholer.py‎

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Original file line numberDiff line numberDiff line change
@@ -52,10 +52,6 @@ def check_jump_targets(self, code):
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tgt.opname == 'RETURN_VALUE'):
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self.fail(f'{instr.opname} at {instr.offset} '
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f'jumps to {tgt.opname} at {tgt.offset}')
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# JUMP_IF_*_OR_POP jump to conditional jump
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if '_OR_POP' in instr.opname and 'JUMP_IF_' in tgt.opname:
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self.fail(f'{instr.opname} at {instr.offset} '
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f'jumps to {tgt.opname} at {tgt.offset}')
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def check_lnotab(self, code):
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"Check that the lnotab byte offsets are sensible."
@@ -384,38 +380,36 @@ def f():
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385381
def test_elim_jump_to_uncond_jump3(self):
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# Intentionally use two-line expressions to test issue37213.
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# JUMP_IF_FALSE_OR_POP to JUMP_IF_FALSE_OR_POP --> JUMP_IF_FALSE_OR_POP to non-jump
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# POP_JUMP_IF_FALSE to POP_JUMP_IF_FALSE --> POP_JUMP_IF_FALSE to non-jump
388384
def f(a, b, c):
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return ((a and b)
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and c)
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self.check_jump_targets(f)
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self.check_lnotab(f)
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self.assertEqual(count_instr_recursively(f, 'JUMP_IF_FALSE_OR_POP'), 2)
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# JUMP_IF_TRUE_OR_POP to JUMP_IF_TRUE_OR_POP --> JUMP_IF_TRUE_OR_POP to non-jump
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_FALSE'), 2)
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# POP_JUMP_IF_TRUE to POP_JUMP_IF_TRUE --> POP_JUMP_IF_TRUE to non-jump
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def f(a, b, c):
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return ((a or b)
397393
or c)
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self.check_jump_targets(f)
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self.check_lnotab(f)
400-
self.assertEqual(count_instr_recursively(f, 'JUMP_IF_TRUE_OR_POP'), 2)
396+
self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_TRUE'), 2)
401397
# JUMP_IF_FALSE_OR_POP to JUMP_IF_TRUE_OR_POP --> POP_JUMP_IF_FALSE to non-jump
402398
def f(a, b, c):
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return ((a and b)
404400
or c)
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self.check_jump_targets(f)
406402
self.check_lnotab(f)
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self.assertNotInBytecode(f, 'JUMP_IF_FALSE_OR_POP')
408-
self.assertInBytecode(f, 'JUMP_IF_TRUE_OR_POP')
409-
self.assertInBytecode(f, 'POP_JUMP_IF_FALSE')
410-
# JUMP_IF_TRUE_OR_POP to JUMP_IF_FALSE_OR_POP --> POP_JUMP_IF_TRUE to non-jump
403+
self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_FALSE'), 1)
404+
self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_TRUE'), 1)
405+
# POP_JUMP_IF_TRUE to POP_JUMP_IF_FALSE --> POP_JUMP_IF_TRUE to non-jump
411406
def f(a, b, c):
412407
return ((a or b)
413408
and c)
414409
self.check_jump_targets(f)
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self.check_lnotab(f)
416-
self.assertNotInBytecode(f, 'JUMP_IF_TRUE_OR_POP')
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self.assertInBytecode(f, 'JUMP_IF_FALSE_OR_POP')
418-
self.assertInBytecode(f, 'POP_JUMP_IF_TRUE')
411+
self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_FALSE'), 1)
412+
self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_TRUE'), 1)
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def test_elim_jump_to_uncond_jump4(self):
421415
def f():

‎Misc/NEWS.d/next/Core and Builtins/2023-03-21-00-46-36.gh-issue-102859.PRkGca.rst‎

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@@ -0,0 +1,2 @@
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Removed :opcode:`JUMP_IF_FALSE_OR_POP` and :opcode:`JUMP_IF_TRUE_OR_POP`
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instructions.

‎Objects/frameobject.c‎

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Original file line numberDiff line numberDiff line change
@@ -306,8 +306,6 @@ mark_stacks(PyCodeObject *code_obj, int len)
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}
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opcode = code[i].op.code;
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switch (opcode) {
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case JUMP_IF_FALSE_OR_POP:
310-
case JUMP_IF_TRUE_OR_POP:
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case POP_JUMP_IF_FALSE:
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case POP_JUMP_IF_TRUE:
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{
@@ -318,16 +316,8 @@ mark_stacks(PyCodeObject *code_obj, int len)
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if (stacks[j] == UNINITIALIZED && j < i) {
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todo = 1;
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}
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if (opcode == JUMP_IF_FALSE_OR_POP ||
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opcode == JUMP_IF_TRUE_OR_POP)
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{
324-
target_stack = next_stack;
325-
next_stack = pop_value(next_stack);
326-
}
327-
else {
328-
next_stack = pop_value(next_stack);
329-
target_stack = next_stack;
330-
}
319+
next_stack = pop_value(next_stack);
320+
target_stack = next_stack;
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assert(stacks[j] == UNINITIALIZED || stacks[j] == target_stack);
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stacks[j] = target_stack;
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stacks[i+1] = next_stack;

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