From e82bdc4809240ab59977b9950288174b2f2dd852 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 7 Nov 2009 09:35:34 +0000
Subject: add the ability for TargetData to return information about legal
 integer datatypes on a given CPU.  This is intended to allow instcombine and
 other transformations to avoid converting big sequences of operations to an
 inconvenient width, and will help clean up after SRoA.  See also "Adding
 legal integer sizes to TargetData" on Feb 1, 2009 on llvmdev, and PR3451.

Comments welcome.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86370 91177308-0d34-0410-b5e6-96231b3b80d8
---
 docs/LangRef.html | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'docs')

diff --git a/docs/LangRef.html b/docs/LangRef.html
index 7032a19814..eea1f03060 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -1215,6 +1215,13 @@ target datalayout = "<i>layout specification</i>"
   <dt><tt>s<i>size</i>:<i>abi</i>:<i>pref</i></tt></dt>
   <dd>This specifies the alignment for a stack object of a given bit
       <i>size</i>.</dd>
+
+  <dt><tt>n<i>size1</i>:<i>size2</i>:<i>size3</i>...</tt></dt>
+  <dd>This specifies a set of native integer widths for the target CPU
+      in bits.  For example, it might contain "n32" for 32-bit PowerPC,
+      "n32:64" for PowerPC 64, or "n8:16:32:64" for X86-64.  Elements of
+      this set are considered to support most general arithmetic 
+      operations efficiently.</dd>
 </dl>
 
 <p>When constructing the data layout for a given target, LLVM starts with a
-- 
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