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[docs] Mention gotcha regarding implicit BB numbering

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Impetus for the clarification by Mikael Lyngvig.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195812 91177308-0d34-0410-b5e6-96231b3b80d8
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Sean Silva 2013-11-27 04:55:23 +00:00
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docs/LangRef.rst
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@ -128,7 +128,9 @@ lexical features of LLVM:
#. Unnamed temporaries are created when the result of a computation is
not assigned to a named value.
#. Unnamed temporaries are numbered sequentially (using a per-function
incrementing counter, starting with 0).
incrementing counter, starting with 0). Note that basic blocks are
included in this numbering. For example, if the entry basic block is not
given a label name, then it will get number 0.
It also shows a convention that we follow in this document. When
demonstrating instructions, we will follow an instruction with a comment