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[LangRef] Specify that load of alloca outside lifetime is poison #157852

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Sep 11, 2025
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[LangRef] Specify that load of alloca outside lifetime is poison #157852

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4 changes: 4 additions & 0 deletions llvm/docs/LangRef.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -3388,6 +3388,10 @@ the object's lifetime. A stack object's lifetime can be explicitly specified
using :ref:`llvm.lifetime.start <int_lifestart>` and
:ref:`llvm.lifetime.end <int_lifeend>` intrinsic function calls.

As an exception to the above, loading from a stack object outside its lifetime
is not undefined behavior and returns a poison value instead. Storing to it is
still undefined behavior.

.. _pointeraliasing:

Pointer Aliasing Rules
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