From 98ed3c7273cbccb69ed322fe2223f3bccd5b7850 Mon Sep 17 00:00:00 2001
From: David Greene <greened@obbligato.org>
Date: Thu, 14 May 2009 21:54:42 +0000
Subject: Implement a !subst operation simmilar to $(subst) in GNU make to do
 def/var/string substitution on generic pattern templates.  For example:

def Type;
def v4f32 : Type;
def TYPE : Type;

class GenType<Type t> {
  let type = !(subst TYPE, v4f32, t);
}

def TheType : GenType<TYPE>;

llvm-svn: 71801
---
 llvm/docs/TableGenFundamentals.html | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'llvm/docs/TableGenFundamentals.html')

diff --git a/llvm/docs/TableGenFundamentals.html b/llvm/docs/TableGenFundamentals.html
index 48fdd2a2018..0186453f368 100644
--- a/llvm/docs/TableGenFundamentals.html
+++ b/llvm/docs/TableGenFundamentals.html
@@ -404,6 +404,9 @@ the symbol table.  If the type of 'a' does not match <em>type</em>, TableGen
 aborts with an error. </dd>
 <dt><tt>!nameconcat&lt;type&gt;(a, b)</tt></dt>
   <dd>Shorthand for !cast<type>(!strconcat(a, b))</dd>
+<dt><tt>!subst(a, b, c)</tt></dt>
+  <dd>If 'a' and 'b' are of string type or are symbol references, substitute 
+'b' for 'a' in 'c.'  This operation is analogous to $(subst) in GNU make.</dd>
 </dl>
 
 <p>Note that all of the values have rules specifying how they convert to values
-- 
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