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gh-106529: Implement POP_JUMP_IF_XXX uops #106551

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Merged
gvanrossum merged 8 commits into from
Jul 10, 2023
Merged

gh-106529: Implement POP_JUMP_IF_XXX uops #106551

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c707cff
First steps towards POP_JUMP_IF_XXX uops
gvanrossum Jul 8, 2023
1e5253a
Add a test showing JUMP_IF_FALSE is emitted
gvanrossum Jul 9, 2023
bf19586
Here's what it would look like with _POP_JUMP_IF_XXX uops
gvanrossum Jul 9, 2023
11d0e11
Add POP_JUMP_IF_TRUE; drop NONE variants
gvanrossum Jul 10, 2023
3923794
Move stubs to be contiguous with main trace
gvanrossum Jul 10, 2023
f119de0
Clean up TestUops a bit
gvanrossum Jul 8, 2023
03370d3
Merge remote-tracking branch 'origin/main' into jump-if-uops
gvanrossum Jul 10, 2023
4b6596e
Include stubs in list(ex)
gvanrossum Jul 10, 2023
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Here's what it would look like with _POP_JUMP_IF_XXX uops
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@gvanrossum
gvanrossum committed Jul 9, 2023
commit bf19586ec555209e309b0375d8b81ab4f87d9578
2 changes: 1 addition & 1 deletion Lib/test/test_capi/test_misc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2541,7 +2541,7 @@ def testfunc(n):
ex = get_first_executor(testfunc.__code__)
self.assertIsNotNone(ex)
uops = {opname for opname, _ in ex}
self.assertIn("JUMP_IF_FALSE", uops)
self.assertIn("_POP_JUMP_IF_FALSE", uops)


if __name__ == "__main__":
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17 changes: 13 additions & 4 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2768,35 +2768,44 @@ _PyUopExecute(_PyExecutorObject *executor, _PyInterpreterFrame *frame, PyObject
#define ENABLE_SPECIALIZATION 0
#include "executor_cases.c.h"

case JUMP_IF_FALSE:
// NOTE: These pop-jumps move the uop pc, not the bytecode ip
case _POP_JUMP_IF_FALSE:
{
if (Py_IsFalse(stack_pointer[-1])) {
pc = oparg;
}
stack_pointer--;
break;
}

case JUMP_IF_TRUE:
case _POP_JUMP_IF_TRUE:
{
if (Py_IsTrue(stack_pointer[-1])) {
pc = oparg;
}
stack_pointer--;
break;
}

case JUMP_IF_NONE:
case _POP_JUMP_IF_NONE:
{
if (Py_IsNone(stack_pointer[-1])) {
pc = oparg;
}
else {
Py_DECREF(stack_pointer[-1]);
}
stack_pointer--;
break;
}

case JUMP_IF_NOT_NONE:
case _POP_JUMP_IF_NOT_NONE:
{
if (!Py_IsNone(stack_pointer[-1])) {
pc = oparg;
Py_DECREF(stack_pointer[-1]);
}
stack_pointer--;
break;
}

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16 changes: 8 additions & 8 deletions Python/opcode_metadata.h
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14 changes: 6 additions & 8 deletions Python/optimizer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -438,18 +438,16 @@ translate_bytecode_to_trace(
case POP_JUMP_IF_FALSE:
{
// Assume jump unlikely (TODO: handle jump likely case)
// Reserve 7 entries (2 here, 3 stub, plus SAVE_IP + EXIT_TRACE)
if (trace_length + 7 > max_length) {
// Reserve 5 entries (1 here, 2 stub, plus SAVE_IP + EXIT_TRACE)
if (trace_length + 5 > max_length) {
DPRINTF(1, "Ran out of space for POP_JUMP_IF_FALSE\n");
goto done;
}
_Py_CODEUNIT *target_instr = instr + 1 + _PyOpcode_Caches[_PyOpcode_Deopt[opcode]] + oparg;
max_length -= 3; // Really the start of the stubs
ADD_TO_TRACE(JUMP_IF_FALSE, max_length);
ADD_TO_TRACE(POP_TOP, 0);
ADD_TO_STUB(max_length, POP_TOP, 0);
ADD_TO_STUB(max_length + 1, SAVE_IP, target_instr - (_Py_CODEUNIT *)code->co_code_adaptive);
ADD_TO_STUB(max_length + 2, EXIT_TRACE, 0);
max_length -= 2; // Really the start of the stubs
ADD_TO_TRACE(_POP_JUMP_IF_FALSE, max_length);
ADD_TO_STUB(max_length, SAVE_IP, target_instr - (_Py_CODEUNIT *)code->co_code_adaptive);
ADD_TO_STUB(max_length + 1, EXIT_TRACE, 0);
break;
}

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8 changes: 4 additions & 4 deletions Tools/cases_generator/generate_cases.py
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Expand Up @@ -1346,10 +1346,10 @@ def add(name: str) -> None:

add("EXIT_TRACE")
add("SAVE_IP")
add("JUMP_IF_FALSE")
add("JUMP_IF_TRUE")
add("JUMP_IF_NONE")
add("JUMP_IF_NOT_NONE")
add("_POP_JUMP_IF_FALSE")
add("_POP_JUMP_IF_TRUE")
add("_POP_JUMP_IF_NONE")
add("_POP_JUMP_IF_NOT_NONE")

for instr in self.instrs.values():
if instr.kind == "op" and instr.is_viable_uop():
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