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Improvements to TableGen/LangIntro.rst

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Document the 'code' data type, and that value{15-17} is different to 
value{17-15}.

Patch by @chenwj (Wei-Ren Chen).

Differential Revision: https://reviews.llvm.org/D32117



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301920 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alex Bradbury 2017-05-02 13:47:10 +00:00
parent bd38dfea4c
commit 6d1bf4ddc4
1 changed files with 7 additions and 2 deletions
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docs/TableGen/LangIntro.rst
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@ -58,6 +58,10 @@ types are:
The 'string' type represents an ordered sequence of characters of arbitrary
length.
``code``
The `code` type represents a code fragment, which can be single/multi-line
string literal.
``bits<n>``
A 'bits' type is an arbitrary, but fixed, size integer that is broken up
into individual bits. This type is useful because it can handle some bits
@ -105,7 +109,7 @@ supported include:
hexadecimal integer value
``"foo"``
string value
a single-line string value, can be assigned to ``string`` or ``code`` variable.
``[{ ... }]``
usually called a "code fragment", but is just a multiline string literal
@ -126,7 +130,8 @@ supported include:
access to one bit of a value
``value{15-17}``
access to multiple bits of a value
access to an ordered sequence of bits of a value, in particular ``value{15-17}``
produces an order that is the reverse of ``value{17-15}``.
``DEF``
reference to a record definition