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Add a paragraph on prefix data layout. 

llvm-svn: 191219
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Peter Collingbourne 2013-09-23 20:14:21 +00:00
parent 9149181ae9
commit 213358aeaa
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llvm/docs/LangRef.rst
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@ -780,6 +780,11 @@ the inliner and other passes to reason about the semantics of the function
definition without needing to reason about the prefix data. Obviously this
makes the format of the prefix data highly target dependent.
Prefix data is laid out as if it were an initializer for a global variable
of the prefix data's type. No padding is automatically placed between the
prefix data and the function body. If padding is required, it must be part
of the prefix data.
A trivial example of valid prefix data for the x86 architecture is ``i8 144``,
which encodes the ``nop`` instruction: