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[GISel][Docs] Add a little bit of documentation for G_FENCE. (#73722)

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Craig Topper 2023-11-28 18:57:20 -08:00 committed by GitHub
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5
llvm/docs/GlobalISel/GenericOpcode.rst
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@ -751,9 +751,10 @@ operands.
G_FENCE
^^^^^^^
.. caution::
Generic fence. The first operand is the memory ordering. The second operand is
the syncscope.
I couldn't find any documentation on this at the time of writing.
See the LLVM LangRef entry on the '``fence'`` instruction for more details.
G_MEMCPY
^^^^^^^^