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[LangRef][IR] Fix default AS documentation for allocas without explicit AS #135942

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Apr 22, 2025
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[LangRef][IR] Fix default AS documentation for allocas without explicit AS #135942

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10 changes: 6 additions & 4 deletions llvm/docs/LangRef.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -11102,9 +11102,8 @@ Overview:

The '``alloca``' instruction allocates memory on the stack frame of the
currently executing function, to be automatically released when this
function returns to its caller. If the address space is not explicitly
specified, the object is allocated in the alloca address space from the
:ref:`datalayout string<langref_datalayout>`.
function returns to its caller. If the address space is not explicitly
specified, the default address space 0 is used.

Arguments:
""""""""""
Expand Down Expand Up @@ -11146,7 +11145,10 @@ which way the stack grows) is not specified.

Note that '``alloca``' outside of the alloca address space from the
:ref:`datalayout string<langref_datalayout>` is meaningful only if the
target has assigned it a semantics.
target has assigned it a semantics. For targets that specify a non-zero alloca
address space in the :ref:`datalayout string<langref_datalayout>`, the alloca
address space needs to be explicitly specified in the instruction if it is to be
used.

If the returned pointer is used by :ref:`llvm.lifetime.start <int_lifestart>`,
the returned object is initially dead.
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