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gh-144681: Fix JIT trace builder assertion failure when conditional branch jump target coincides with fallthrough target (GH-144742)

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Hai Zhu 2026-03-10 12:12:48 +08:00 • committed by GitHub
parent 099943b122
commit 66eafc9ea7
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3 changed files with 16 additions and 2 deletions
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Python/optimizer.c
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@ -786,8 +786,8 @@ _PyJit_translate_single_bytecode_to_trace(
_Py_CODEUNIT *computed_next_instr = computed_next_instr_without_modifiers + (computed_next_instr_without_modifiers->op.code == NOT_TAKEN);
_Py_CODEUNIT *computed_jump_instr = computed_next_instr_without_modifiers + oparg;
assert(next_instr == computed_next_instr || next_instr == computed_jump_instr);
int jump_happened = computed_jump_instr == next_instr;
assert(jump_happened == (target_instr[1].cache & 1));
int jump_happened = target_instr[1].cache & 1;
assert(jump_happened ? (next_instr == computed_jump_instr) : (next_instr == computed_next_instr));
uint32_t uopcode = BRANCH_TO_GUARD[opcode - POP_JUMP_IF_FALSE][jump_happened];
ADD_TO_TRACE(uopcode, 0, 0, INSTR_IP(jump_happened ? computed_next_instr : computed_jump_instr, old_code));
break;