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GeezerVison is showing github.com — JIT does not emit trampolines for jumps to addresses encoded as operands · Issue #149316 · python/cpython

JIT does not emit trampolines for jumps to addresses encoded as operands #149316

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JIT does not emit trampolines for jumps to addresses encoded as operands#149316
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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@markshannon
markshannon
opened on May 3, 2026
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Bug report

Bug description:

We need to declare variables volatile here and in #148745 otherwise the code generator emits normal jumps without the necessary patching to add trampolines.

For more details see #148745 (comment)

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

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  1. markshannon
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    topic-JIT
    on May 3, 2026
  2. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    on May 3, 2026

  3. NekoAsakura commented on May 3, 2026

    @NekoAsakura
    NekoAsakura
    on May 3, 2026
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    Same workarounds:

    cpython/Python/bytecodes.c

    Line 5129 in 7c9ad27

    volatile PyCFunctionFastWithKeywords cfunc_v = _PyCFunctionFastWithKeywords_CAST(cfunc);

    cpython/Python/bytecodes.c

    Line 5199 in 7c9ad27

    volatile PyCFunction cfunc_v = (PyCFunction)cfunc;

    cpython/Python/bytecodes.c

    Line 5272 in 7c9ad27

    volatile PyCFunctionFast cfunc_v = _PyCFunctionFast_CAST(cfunc);

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    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-JITtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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