Improvements to TableGen/LangIntro.rst
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
llvm-svn: 301920
diff --git a/llvm/docs/TableGen/LangIntro.rst b/llvm/docs/TableGen/LangIntro.rst
index d8bd17d..460ff90 100644
--- a/llvm/docs/TableGen/LangIntro.rst
+++ b/llvm/docs/TableGen/LangIntro.rst
@@ -58,6 +58,10 @@
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 @@
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 @@
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