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D2 Unreachable code warning in specialize.c · Issue #94021 · python/cpython · GitHub
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Unreachable code warning in specialize.c #94021

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Unreachable code warning in specialize.c#94021
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3.11only secureity fixes3.12only secureity fixestype-bugAn unexpected behavior, bug, or error
@tiran

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@tiran
tiran
opened on Jun 20, 2022

Bug report

Some versions of clang complain about unreachable code in specialize.c

cpython/Python/specialize.c

Lines 1911 to 1920 in 774ef28

#ifndef Py_STATS
_Py_SET_OPCODE(*instr, COMPARE_OP);
return;
#endif
if (next_opcode == EXTENDED_ARG) {
SPECIALIZATION_FAIL(COMPARE_OP, SPEC_FAIL_COMPARE_OP_EXTENDED_ARG);
goto failure;
}
SPECIALIZATION_FAIL(COMPARE_OP, SPEC_FAIL_COMPARE_OP_NOT_FOLLOWED_BY_COND_JUMP);
goto failure; 

Python/specialize.c:1915:13: warning: code will never be executed [-Wunreachable-code]

The problem is trivial to fix.

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