From cc349c8dd83fb0fdc827c786415bbec629cb05c6 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Mon, 3 Oct 2011 14:45:37 +0000
Subject: Add the returns_twice attribute to LLVM.

llvm-svn: 141001
---
 llvm/docs/LangRef.html | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'llvm/docs')

diff --git a/llvm/docs/LangRef.html b/llvm/docs/LangRef.html
index 0ec08eb0a05..7882da67e1a 100644
--- a/llvm/docs/LangRef.html
+++ b/llvm/docs/LangRef.html
@@ -1262,6 +1262,11 @@ define void @f() optsize { ... }
       the ELF x86-64 abi, but it can be disabled for some compilation
       units.</dd>
 
+  <dt><tt><b><a name="returns_twice">returns_twice</a></b></tt></dt>
+  <dd>This attribute indicates that this function can return
+  twice. The C <code>setjmp</code> is an example of such a function.
+  The compiler disables some optimizations (like tail calls) in the caller of
+  these functions.</dd>
 </dl>
 
 </div>
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